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Fisher information metric

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5657: 5230: 7889: 7011: 5241: 4904: 4824: 6441: 5652:{\displaystyle {\begin{aligned}g_{jk}(\theta )=4h_{jk}^{\mathrm {fisher} }&=4h\left({\frac {\partial }{\partial \theta _{j}}},{\frac {\partial }{\partial \theta _{k}}}\right)\\&=\sum _{i}p_{i}(\theta )\;{\frac {\partial \log p_{i}(\theta )}{\partial \theta _{j}}}\;{\frac {\partial \log p_{i}(\theta )}{\partial \theta _{k}}}\\&=\mathrm {E} \left\end{aligned}}} 7362: 6727: 1374: 5225:{\displaystyle {\begin{aligned}h&={\frac {1}{4}}\sum _{i}p_{i}(\theta )\;d(\log p_{i}(\theta ))\;d(\log p_{i}(\theta ))\\&={\frac {1}{4}}\sum _{jk}\sum _{i}p_{i}(\theta )\;{\frac {\partial \log p_{i}(\theta )}{\partial \theta _{j}}}{\frac {\partial \log p_{i}(\theta )}{\partial \theta _{k}}}d\theta _{j}d\theta _{k}\end{aligned}}} 7339: 3851: 3154: 4551: 6296: 924: 7884:{\displaystyle {\begin{aligned}h_{jk}={}&h\left({\frac {\partial }{\partial \theta _{j}}},{\frac {\partial }{\partial \theta _{k}}}\right)\\={}&{\frac {1}{4}}\mathrm {E} \left\\{}&+\mathrm {E} \left-\mathrm {E} \left\mathrm {E} \left\\&{}+{\frac {i}{2}}\mathrm {E} \left\end{aligned}}} 7006:{\displaystyle {\begin{aligned}ds^{2}={}&{\frac {1}{4}}\int _{X}(\delta \log p)^{2}\;p\,dx\\{}&+\int _{X}(\delta \alpha )^{2}\;p\,dx-\left(\int _{X}\delta \alpha \;p\,dx\right)^{2}\\&{}+{\frac {i}{2}}\int _{X}(\delta \log p\delta \alpha -\delta \alpha \delta \log p)\;p\,dx\end{aligned}}} 2397: 5790:
is not discrete, but continuous, the argument still holds. This can be seen in one of two different ways. One way is to carefully recast all of the above steps in an infinite-dimensional space, being careful to define limits appropriately, etc., in order to make sure that all manipulations are
4443:
This embedding induces a metric on the sphere, it is inherited directly from the Euclidean metric on the ambient space. It takes exactly the same form as the above, taking care to ensure that the coordinates are constrained to lie on the surface of the sphere. This can be done, e.g. with the
1194: 7920:. Equivalently, the Fubini–Study metric can be understood as the metric on complex projective Hilbert space that is induced by the complex extension of the flat Euclidean metric. The difference between this, and the Bures metric, is that the Bures metric is written in terms of mixed states. 527: 3686: 3431: 5767:; whereas the non-coordinate form is the same as the Euclidean (flat-space) metric. That is, the Fisher information metric on a statistical manifold is simply (four times) the Euclidean metric restricted to the positive orthant of the sphere, after appropriate changes of variable. 4342: 2729: 2005: 1648: 8392: 7045:
in the above makes it clear that the first term is (one-fourth of) the Fisher information metric. The full form of the above can be made slightly clearer by changing notation to that of standard Riemannian geometry, so that the metric becomes a symmetric
7122: 3705: 2950: 6602: 4819:{\displaystyle {\begin{aligned}h&=\sum _{i}dy_{i}\;dy_{i}=\sum _{i}d{\sqrt {p_{i}}}\;d{\sqrt {p_{i}}}\\&={\frac {1}{4}}\sum _{i}{\frac {dp_{i}\;dp_{i}}{p_{i}}}={\frac {1}{4}}\sum _{i}p_{i}\;d(\log p_{i})\;d(\log p_{i})\end{aligned}}} 6436:{\displaystyle ds^{2}={\frac {\langle \delta \psi \mid \delta \psi \rangle }{\langle \psi \mid \psi \rangle }}-{\frac {\langle \delta \psi \mid \psi \rangle \;\langle \psi \mid \delta \psi \rangle }{{\langle \psi \mid \psi \rangle }^{2}}}.} 5742: 2257: 707: 6716: 4210: 5944: 380: 3537: 3306: 7367: 185: 4222: 1369:{\displaystyle g_{jk}(\theta )={\frac {\partial ^{2}A(\theta )}{\partial \theta _{j}\,\partial \theta _{k}}}-{\frac {\partial ^{2}\eta (\theta )}{\partial \theta _{j}\,\partial \theta _{k}}}\cdot \mathrm {E} } 6732: 2609: 2461: 1865: 6239: 4127: 1873: 1501: 6497: 7127: 1058: 695: 2136: 2252: 8505: 5246: 4909: 4556: 1189: 4043: 369: 2520: 2055: 1789: 1497: 6162: 8275: 8025: 6634: 4438: 2909: 3235: 4829:
The last can be recognized as one-fourth of the Fisher information metric. To complete the process, recall that the probabilities are parametric functions of the manifold variables
3969: 3264:. This can be thought of intuitively as: "The distance between two infinitesimally close points on a statistical differential manifold is the informational difference between them." 8088: 1448: 1413: 7334:{\displaystyle {\begin{aligned}h={}&{\frac {1}{4}}\mathrm {E} \left+\mathrm {E} \left-\left(\mathrm {E} \left\right)^{2}\\{}&+{\frac {i}{2}}\mathrm {E} \left\end{aligned}}} 8710: 6097: 4896: 2942: 1016: 6056: 2762: 1726: 4078: 3498: 2858: 7975: 7043: 6277: 5982: 4540: 2195: 220: 8748: 4494: 2601: 1684: 3846:{\displaystyle \int _{a}^{b}{\sqrt {{\frac {\partial \theta ^{j}}{\partial t}}g_{jk}{\frac {\partial \theta ^{k}}{\partial t}}}}\,dt={\sqrt {8}}\int _{a}^{b}{\sqrt {dJSD}}} 3149:{\displaystyle f_{\theta _{0}}(\theta ):=D_{\mathrm {KL} }={\frac {1}{2}}\sum _{jk}\Delta \theta ^{j}\Delta \theta ^{k}g_{jk}(\theta _{0})+\mathrm {O} (\Delta \theta ^{3})} 8226: 7078: 6021: 8449: 8422: 7114: 3262: 2565: 8842: 8783: 8259: 8055: 7918: 6509: 8667: 8647: 8627: 8176: 5765: 5668: 4847: 2782: 2163: 601: 558: 311: 240: 8114: 3188: 3901: 8862: 8807: 8607: 8529: 8152: 919:{\displaystyle g_{jk}(\theta )=\int _{R}{\frac {\partial ^{2}i(x\mid \theta )}{\partial \theta _{j}\,\partial \theta _{k}}}p(x\mid \theta )\,dx=\mathrm {E} \left.} 5799:
approach; that is, to note that the above manipulations remain valid in the category of probabilities. Here, one should note that such a category would have the
5788: 4365: 291: 260: 6650: 4139: 2392:{\displaystyle \phi \mapsto {\mathcal {N}}\left({\frac {\mu _{0}+\mu _{1}}{2}}+{\frac {\mu _{1}-\mu _{0}}{2}}\cos \phi ,\sigma ^{2}\sin ^{2}\phi \right)} 522:{\displaystyle g_{jk}(\theta )=-\int _{R}{\frac {\partial ^{2}\log p(x\mid \theta )}{\partial \theta _{j}\,\partial \theta _{k}}}p(x\mid \theta )\,dx.} 5860: 5811:; these are square-integrable, and in the manipulations above, this is sufficient to safely replace the sum over squares by an integral over squares. 3681:{\displaystyle (b-a)\int _{a}^{b}{\frac {\partial \theta ^{j}}{\partial t}}g_{jk}{\frac {\partial \theta ^{k}}{\partial t}}\,dt=8\int _{a}^{b}dJSD} 3426:{\displaystyle A={\frac {1}{2}}\int _{a}^{b}{\frac {\partial \theta ^{j}}{\partial t}}g_{jk}(\theta ){\frac {\partial \theta ^{k}}{\partial t}}dt} 104:. Considered as a measurement technique, where it is used to estimate hidden parameters in terms of observed random variables, it is known as the 5843:. By setting the phase of the complex coordinate to zero, one obtains exactly one-fourth of the Fisher information metric, exactly as above. 4337:{\displaystyle h_{jk}^{\mathrm {flat} }=h\left({\frac {\partial }{\partial y_{j}}},{\frac {\partial }{\partial y_{k}}}\right)=\delta _{jk}} 119: 4347:
The superscript 'flat' is there to remind that, when written in coordinate form, this metric is with respect to the flat-space coordinate
2724:{\displaystyle P(\theta )=P(\theta _{0})+\sum _{j}\Delta \theta ^{j}\left.{\frac {\partial P}{\partial \theta ^{j}}}\right|_{\theta _{0}}} 5827:. This should perhaps be no surprise, as the Fubini–Study metric provides the means of measuring information in quantum mechanics. The 2402: 2000:{\displaystyle g={\begin{bmatrix}t&0\\0&(2t^{2})^{-1}\end{bmatrix}}=\sigma ^{-2}{\begin{bmatrix}1&0\\0&2\end{bmatrix}}} 1794: 1075: 6173: 8864:; for details, refer to original sources). Thus, one has the appearance of logarithms in the simpler definition, previously given. 4091: 9230:
Facchi, Paolo; et al. (2010). "Classical and Quantum Fisher Information in the Geometrical Formulation of Quantum Mechanics".
6449: 1024: 633: 58:, the Fisher information metric on statistical models is the only Riemannian metric (up to rescaling) that is invariant under 9203: 8673: 8844:, the logarithm gives a point in the tangent space (roughly speaking, as again, one must transport from the origin to point 3856:
That is, the square root of the Jensen–Shannon divergence is just the Fisher metric (divided by the square root of 8).
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is understood to be the infinitesimal change in the Jensen–Shannon divergence along the path taken. Similarly, for the
1643:{\displaystyle -\ln p(x|\mu ,\Sigma )={\frac {1}{2}}(x-\mu )^{T}\Sigma ^{-1}(x-\mu )+{\frac {1}{2}}\ln \det(\Sigma )+C} 9060: 8990: 3977: 316: 8577:
This definition of the metric can be seen to be equivalent to the previous, in several steps. First, one selects a
2466: 8387:{\displaystyle g(\sigma _{1},\sigma _{2})=\int _{X}{\frac {d\sigma _{1}}{d\mu }}{\frac {d\sigma _{2}}{d\mu }}d\mu } 1458: 624: 8507:. The abuse of notation is to write the tangent vectors as if they are derivatives, and to insert the extraneous 2010: 1731: 1463: 6109: 2535: 70: 7988: 6610: 4384: 3868:, that is, a probability space on a finite set of objects, the Fisher metric can be understood to simply be the 9430: 5792: 2863: 3197: 9440: 9435: 3916: 3528: 3516: 8063: 1418: 1383: 8540: 8679: 7894:
Again, the first term can be clearly seen to be (one fourth of) the Fisher information metric, by setting
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is finite-dimensional, then so is the submanifold; likewise, the tangent space has the same dimension as
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dimensions smaller than the original space. In this case, the metric can be explicitly derived from the
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The above manipulations deriving the Fisher metric from the Euclidean metric can be extended to complex
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Feng, Edward H.; Crooks, Gavin E. (2009). "Far-from-equilibrium measurements of thermodynamic length".
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The shortest paths (geodesics) between two univariate normal distributions are either parallel to the
190: 8910:"A Simple Approximation Method for the Fisher–Rao Distance between Multivariate Normal Distributions" 8715: 5804: 5747:
The superscript 'fisher' is present to remind that this expression is applicable for the coordinates
4454: 101: 2570: 1653: 5820: 82: 8196: 7057: 6597:{\displaystyle \langle \phi \mid \psi \rangle =\int _{X}\phi ^{*}(x;\theta )\psi (x;\theta )\,dx.} 5991: 3515:
path between the desired endpoints of the process. The geodesic minimizes the entropy, due to the
9284: 8427: 8400: 7083: 6283: 5824: 3240: 86: 8873: 5737:{\displaystyle d\theta _{j}\left({\frac {\partial }{\partial \theta _{k}}}\right)=\delta _{jk}.} 2541: 8812: 8753: 8234: 8034: 7897: 6636:
can be understood to be an infinitesimal variation; equivalently, it can be understood to be a
55: 9183: 5835:, is identical to the Fubini–Study metric, although the latter is usually written in terms of 77:
of the divergence. Alternately, it can be understood as the metric induced by the flat space
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provides a map from vectors in a tangent space to points in an underlying manifold. Thus, if
8652: 8632: 8612: 8161: 5985: 5847: 5840: 5750: 4832: 3511:: in order to minimize the change in free entropy of a system, one should follow the minimum 2767: 2148: 586: 543: 296: 225: 90: 8093: 3163: 9361: 9249: 9213: 8931: 8888: 8120: 6287: 3879: 3503:
as the change in free entropy. This observation has resulted in practical applications in
105: 59: 32: 20: 8847: 8792: 8592: 8514: 8178:
held fixed). Note that this space is infinite-dimensional, and is commonly taken to be a
8137: 8: 7936: 4445: 3508: 3297: 604: 561: 44: 9365: 9253: 9099: 9076:
Brody, Dorje; Hook, Daniel (2008). "Information geometry in vapour-liquid equilibrium".
8954: 8935: 8909: 9396: 9385: 9351: 9265: 9239: 9161: 9135: 9103: 9085: 9033: 9015: 8921: 8883: 8878: 8786: 6644:. Using the infinitesimal notation, the polar form of the probability above is simply 5796: 5773: 4350: 1069: 698: 276: 245: 8511:
in writing the integral: the integration is meant to be carried out using the measure
9377: 9199: 9153: 9107: 9056: 8986: 8959: 8559: 8266: 8028: 6711:{\displaystyle \delta \psi =\left({\frac {\delta p}{2p}}+i\delta \alpha \right)\psi } 3519:, which states that the action is bounded below by the length of the curve, squared. 3504: 608: 580: 48: 28: 9269: 9389: 9369: 9307: 9299: 9261: 9257: 9191: 9165: 9145: 9095: 9037: 9025: 8949: 8939: 8558:, and more specifically, the tangent space is restricted to those vectors that are 5851: 4205:{\displaystyle dy_{j}\left({\frac {\partial }{\partial y_{k}}}\right)=\delta _{jk}} 3869: 3527:
The Fisher metric also allows the action and the curve length to be related to the
3293: 3273: 78: 9149: 8179: 9410:, Translations of mathematical monographs; v. 191, American Mathematical Society. 9303: 9209: 8563: 7353: 7345: 6641: 5832: 4085: 3277: 267: 51:. It can be used to calculate the informational difference between measurements. 40: 9413:
Paolo Gibilisco, Eva Riccomagno, Maria Piera Rogantin and Henry P. Wynn, (2009)
5939:{\displaystyle \psi (x;\theta )={\sqrt {p(x;\theta )}}\;e^{i\alpha (x;\theta )}} 65:
It can also be understood to be the infinitesimal form of the relative entropy (
9373: 8536: 3191: 74: 9029: 9424: 8571: 8567: 8262: 8229: 8058: 7978: 7051: 5808: 4130: 3281: 619:
different expectation values constant, then the dimension of the manifold is
576: 4496:. The sphere condition now becomes the probability normalization condition 607:; Lagrange multipliers are used to enforce constraints, such as holding the 9381: 9157: 8963: 5828: 3696: 222:
for the likelihood, that is the probability density of x as a function of
94: 6167:
is equivalently expressed by the idea the square amplitude be normalized:
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Alternatively, the metric can be obtained as the second derivative of the
8578: 7349: 1689:
The metric splits to a mean part and a precision/variance part, because
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Dowty, James G. (2018). "Chentsov's theorem for exponential families".
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are strictly real. The previous calculations are obtained by setting
5836: 929:
To show that the equivalent form equals the above definition note that
9334: 9195: 8944: 8535:. This abuse of notation is, in fact, taken to be perfectly normal in 7928:
A slightly more formal, abstract definition can be given, as follows.
180:{\displaystyle \theta =(\theta _{1},\theta _{2},\ldots ,\theta _{n})} 9020: 8926: 3512: 81:, after appropriate changes of variable. When extended to complex 9356: 9244: 9140: 9090: 6100: 3873: 3441: 2456:{\displaystyle \sigma ={\frac {\mu _{1}-\mu _{0}}{2{\sqrt {2}}}}} 1860:{\displaystyle g_{T,T}=-{\frac {1}{2}}\nabla _{T}^{2}\ln \det T} 7116:
and noting that the integrals are just expectation values; so:
7047: 6637: 6234:{\displaystyle \int _{X}\vert \psi (x;\theta )\vert ^{2}\,dx=1} 4898:. Thus, the above induces a metric on the parameter manifold: 4081: 4378: + 1)-dimensional Euclidean space may be defined as 4122:{\displaystyle \textstyle {\frac {\partial }{\partial y_{j}}}} 2538:. To obtain this, one considers two probability distributions 2525: 1376:
The metric has a particularly simple form if we are using the
9229: 1068:
The Fisher information metric is particularly simple for the
6492:{\displaystyle \langle x\mid \psi \rangle =\psi (x;\theta )} 3522: 9126:
Crooks, Gavin E. (2009). "Measuring thermodynamic length".
8672:
With some additional abuse of language, one notes that the
5791:
well-defined, convergent, etc. The other way, as noted by
3903:) of a unit sphere, after appropriate changes of variable. 2675: 8609:
that are parameterized by some smoothly varying parameter
6286:, written in infinitesimal form, using quantum-mechanical 5235:
or, in coordinate form, the Fisher information metric is:
2603:, which are infinitesimally close to one another, so that 9190:. ZĂĽrich: European Mathematical Society. pp. 51–78. 1053:{\displaystyle {\frac {\partial }{\partial \theta _{k}}}} 690:{\displaystyle i(x\mid \theta )=-\log {}p(x\mid \theta )} 8546:
In order for the integral to be well-defined, the space
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Inserting the above into the Fubini–Study metric gives:
3284:
as the ones found in equilibrium statistical mechanics.
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direction. Then, since the Kullback–Leibler divergence
1870:
In particular, for single variable normal distribution,
9403:, Lecture Notes in Statistics, Springer-Verlag, Berlin. 8750:
is the corresponding probability associated with point
6099:. The usual condition that probabilities lie within a 8562:. Square integrability is equivalent to saying that a 4095: 4055: 3440:; this action can be understood to give the change in 2131:{\displaystyle ds^{2}=2{\frac {dx^{2}+dy^{2}}{y^{2}}}} 1966: 1888: 8985:. New York: Oxford University Press. pp. 37–40. 8850: 8815: 8795: 8756: 8718: 8682: 8655: 8635: 8615: 8595: 8517: 8457: 8430: 8403: 8278: 8237: 8199: 8164: 8140: 8096: 8066: 8037: 7991: 7945: 7900: 7365: 7125: 7086: 7060: 7022: 6730: 6653: 6613: 6512: 6452: 6299: 6250: 6176: 6112: 6064: 6029: 5994: 5955: 5863: 5776: 5753: 5671: 5244: 4907: 4855: 4835: 4554: 4505: 4457: 4387: 4353: 4225: 4142: 4094: 4054: 3980: 3919: 3882: 3708: 3540: 3461: 3309: 3243: 3200: 3166: 2953: 2917: 2866: 2794: 2770: 2740: 2612: 2573: 2544: 2469: 2405: 2260: 2247:{\displaystyle \delta _{\mu _{0}},\delta _{\mu _{1}}} 2206: 2171: 2151: 2063: 2013: 1876: 1797: 1734: 1695: 1656: 1504: 1466: 1421: 1386: 1197: 1078: 1027: 938: 710: 636: 589: 546: 383: 319: 299: 279: 248: 228: 193: 122: 8500:{\displaystyle \sigma _{1},\sigma _{2}\in T_{\mu }S} 7923: 5839:, as below, whereas the Bures metric is written for 374:The Fisher information metric then takes the form: 8856: 8836: 8801: 8777: 8742: 8704: 8661: 8641: 8621: 8601: 8523: 8499: 8443: 8416: 8386: 8253: 8220: 8170: 8146: 8108: 8082: 8049: 8019: 7969: 7912: 7883: 7333: 7108: 7072: 7054:. The change of notation is done simply replacing 7037: 7005: 6710: 6628: 6596: 6491: 6435: 6271: 6233: 6156: 6091: 6050: 6015: 5976: 5938: 5846:One begins with the same trick, of constructing a 5782: 5759: 5736: 5651: 5224: 4890: 4841: 4818: 4534: 4488: 4432: 4359: 4336: 4204: 4121: 4072: 4037: 3963: 3895: 3845: 3680: 3492: 3425: 3256: 3229: 3182: 3148: 2936: 2903: 2852: 2776: 2756: 2723: 2595: 2559: 2514: 2455: 2391: 2246: 2189: 2157: 2130: 2049: 1999: 1859: 1783: 1720: 1678: 1642: 1491: 1442: 1407: 1368: 1183: 1052: 1010: 918: 689: 627:; a derivation and discussion is presented there. 595: 552: 521: 363: 305: 285: 254: 234: 214: 179: 100:Considered purely as a matrix, it is known as the 9184:"In a search for a structure, Part 1: On entropy" 8570:: the space contains its limit points. Note that 3280:are the Fisher information metric calculated for 3267: 1103: 701:, an equivalent form of the above definition is: 572:index the local coordinate axes on the manifold. 54:The metric is interesting in several aspects. By 9422: 9055:(2nd ed.). Hoboken: John Wiley & Sons. 8979:"Chentsov's theorem and some historical remarks" 1851: 1622: 1184:{\displaystyle p(x\mid \theta )=\exp \!{\bigl }} 9285:"Fisher information metric and Poisson kernels" 4038:{\displaystyle h=\sum _{i=0}^{N}dy_{i}\;dy_{i}} 3906:Consider a flat, Euclidean space, of dimension 364:{\displaystyle \int _{R}p(x\mid \theta )\,dx=1} 9401:Differential-geometrical methods in statistics 6499:and integration over the entire measure space 3971:. The metric for Euclidean space is given by 2515:{\displaystyle s={\sqrt {2}}\ln \tan(\phi /2)} 116:Given a statistical manifold with coordinates 9415:Algebraic and Geometric Methods in Statistics 2911:, one has an expansion up to second order in 1176: 1106: 9282: 8976: 8451:are vectors in the tangent space; that is, 6623: 6614: 6525: 6513: 6465: 6453: 6418: 6406: 6400: 6385: 6381: 6366: 6354: 6342: 6337: 6319: 6209: 6187: 3020: 2832: 2165:axis, or half circular arcs centered on the 2050:{\displaystyle x=\mu /{\sqrt {2}},y=\sigma } 1784:{\displaystyle g_{\mu _{i},\mu _{j}}=T_{ij}} 1492:{\displaystyle {\mathcal {N}}(\mu ,\Sigma )} 9050: 8977:Amari, Shun-ichi; Nagaoka, Horishi (2000). 8261:. The Fisher information metric is then an 6157:{\displaystyle \int _{X}p(x;\theta )\,dx=1} 2526:Relation to the Kullback–Leibler divergence 9341: 9332:The information geometry of mirror descent 9330:Garvesh Raskutti Sayan Mukherjee, (2014). 9292:Differential Geometry and Its Applications 9283:Itoh, Mitsuhiro; Shishido, Yuichi (2008). 8020:{\displaystyle (\Omega ,{\mathcal {F}},P)} 6988: 6889: 6853: 6800: 6629:{\displaystyle \vert \delta \psi \rangle } 6384: 6279:is real, this is the surface of a sphere. 5907: 5807:holds in this category. This includes the 5590: 5471: 5421: 5093: 4996: 4961: 4786: 4760: 4700: 4636: 4592: 4433:{\displaystyle \sum _{i=0}^{N}y_{i}^{2}=1} 4021: 532:The integral is performed over all values 9355: 9311: 9243: 9139: 9089: 9075: 9051:Cover, Thomas M.; Thomas, Joy A. (2006). 9019: 8953: 8943: 8925: 6992: 6893: 6857: 6804: 6584: 6218: 6141: 5814: 3795: 3638: 3523:Relation to the Jensen–Shannon divergence 3489: 3287: 2904:{\displaystyle P(\theta )=P(\theta _{0})} 1728:. The mean part is the precision matrix: 1323: 1263: 892: 827: 792: 611:of some quantity constant. If there are 575:When the probability is derived from the 509: 474: 348: 9406:Shun'ichi Amari, Hiroshi Nagaoka (2000) 9225: 9223: 9177: 9175: 9121: 9119: 9117: 8134:is defined as the space of all measures 3230:{\displaystyle f_{\theta _{0}}(\theta )} 2463:, and the arc-length parametrization is 8907: 8712:is a vector in the tangent space, then 4216:the Euclidean metric may be written as 3964:{\displaystyle y=(y_{0},\cdots ,y_{n})} 3190:is positive (semi) definite and is the 16:Metric on a smooth statistical manifold 9423: 9181: 9125: 8566:converges to a finite value under the 8539:; it is the standard notation for the 8083:{\displaystyle {\mathcal {F}}=\Sigma } 4374:-dimensional unit sphere embedded in ( 3859: 1453: 1443:{\displaystyle \nabla _{\theta }^{2}A} 1408:{\displaystyle \eta (\theta )=\theta } 9220: 9172: 9114: 9005: 8589:) by considering only those measures 7356:. In index notation, the metric is: 4084:; they are the basis vectors for the 3444:of a system as it is moved from time 273:. The likelihood is normalized over 9069: 8705:{\displaystyle \sigma \in T_{\mu }S} 6092:{\displaystyle \alpha (x;\theta )=0} 4891:{\displaystyle p_{i}=p_{i}(\theta )} 4451:Consider now the change of variable 9335:https://arxiv.org/pdf/1310.7780.pdf 2937:{\displaystyle \theta =\theta _{0}} 2764:an infinitesimally small change of 1011:{\displaystyle \mathrm {E} \left=0} 13: 8165: 8077: 8069: 8038: 8003: 7995: 7955: 7856: 7842: 7823: 7815: 7793: 7785: 7766: 7752: 7740: 7697: 7689: 7678: 7657: 7649: 7638: 7613: 7605: 7586: 7578: 7566: 7531: 7517: 7498: 7484: 7472: 7429: 7425: 7404: 7400: 7292: 7237: 7194: 7151: 6051:{\displaystyle \alpha (x;\theta )} 5695: 5691: 5624: 5594: 5574: 5544: 5532: 5505: 5475: 5455: 5425: 5361: 5357: 5336: 5332: 5306: 5303: 5300: 5297: 5294: 5291: 5176: 5146: 5127: 5097: 4297: 4293: 4272: 4268: 4249: 4246: 4243: 4240: 4166: 4162: 4102: 4098: 3784: 3769: 3744: 3729: 3629: 3614: 3589: 3574: 3462: 3408: 3393: 3359: 3344: 3130: 3123: 3077: 3064: 2992: 2989: 2860:has an absolute minimum of 0 when 2804: 2801: 2757:{\displaystyle \Delta \theta ^{j}} 2741: 2688: 2680: 2660: 2269: 1831: 1721:{\displaystyle g_{\mu ,\Sigma }=0} 1707: 1664: 1628: 1576: 1534: 1483: 1469: 1423: 1344: 1324: 1310: 1287: 1264: 1250: 1227: 1034: 1030: 982: 951: 940: 893: 879: 850: 838: 793: 779: 750: 475: 461: 426: 14: 9452: 8265:on the tangent space. With some 7924:Continuously-valued probabilities 4073:{\displaystyle \textstyle dy_{i}} 3493:{\displaystyle \Delta S=(b-a)A\,} 2853:{\displaystyle D_{\mathrm {KL} }} 31:which can be defined on a smooth 9417:, Cambridge U. Press, Cambridge. 9188:European Congress of Mathematics 7970:{\displaystyle (X,\Sigma ,\mu )} 7038:{\displaystyle \delta \alpha =0} 6272:{\displaystyle \psi (x;\theta )} 5977:{\displaystyle \psi (x;\theta )} 5823:. In this case, one obtains the 4535:{\displaystyle \sum _{i}p_{i}=1} 3436:The path parameter here is time 2190:{\displaystyle \mu /{\sqrt {2}}} 1459:Multivariate normal distribution 215:{\displaystyle p(x\mid \theta )} 9408:Methods of information geometry 8983:Methods of Information Geometry 8743:{\displaystyle p=\exp(\sigma )} 6446:In this notation, one has that 4489:{\displaystyle p_{i}=y_{i}^{2}} 603:can also be understood to be a 266:for a (discrete or continuous) 9276: 9262:10.1016/j.physleta.2010.10.005 9053:Elements of Information Theory 9044: 8999: 8970: 8901: 8831: 8825: 8772: 8766: 8737: 8731: 8308: 8282: 8215: 8209: 8014: 7992: 7964: 7946: 7213: 7203: 7176: 7160: 7100: 7064: 6985: 6943: 6844: 6834: 6791: 6775: 6581: 6569: 6563: 6551: 6486: 6474: 6266: 6254: 6205: 6193: 6138: 6126: 6080: 6068: 6045: 6033: 6010: 5998: 5971: 5959: 5931: 5919: 5902: 5890: 5879: 5867: 5619: 5613: 5569: 5563: 5500: 5494: 5450: 5444: 5418: 5412: 5268: 5262: 5171: 5165: 5122: 5116: 5090: 5084: 5028: 5025: 5019: 5000: 4993: 4990: 4984: 4965: 4958: 4952: 4885: 4879: 4809: 4790: 4783: 4764: 3958: 3926: 3553: 3541: 3483: 3471: 3387: 3381: 3268:Relation to Ruppeiner geometry 3224: 3218: 3143: 3127: 3116: 3103: 3035: 3032: 3026: 3017: 3004: 2998: 2977: 2971: 2898: 2885: 2876: 2870: 2847: 2844: 2838: 2829: 2816: 2810: 2644: 2631: 2622: 2616: 2596:{\displaystyle P(\theta _{0})} 2590: 2577: 2554: 2548: 2509: 2495: 2264: 1925: 1908: 1679:{\displaystyle T=\Sigma ^{-1}} 1631: 1625: 1600: 1588: 1566: 1553: 1537: 1524: 1517: 1486: 1474: 1396: 1390: 1363: 1360: 1354: 1348: 1305: 1299: 1245: 1239: 1217: 1211: 1168: 1162: 1153: 1147: 1138: 1132: 1123: 1117: 1094: 1082: 977: 965: 874: 862: 824: 812: 774: 762: 730: 724: 684: 672: 652: 640: 506: 494: 456: 444: 403: 397: 345: 333: 262:is drawn from the value space 209: 197: 174: 129: 1: 9324: 9150:10.1103/PhysRevLett.99.100602 9100:10.1088/1751-8113/42/2/023001 8809:.) Conversely, given a point 4129:as the basis vectors for the 111: 9304:10.1016/j.difgeo.2007.11.027 8221:{\displaystyle \mu \in S(X)} 7073:{\displaystyle \delta \to d} 6016:{\displaystyle p(x;\theta )} 7: 8867: 8444:{\displaystyle \sigma _{2}} 8417:{\displaystyle \sigma _{1}} 7109:{\displaystyle ds^{2}\to h} 3257:{\displaystyle \theta _{0}} 2536:Kullback–Leibler divergence 1063: 89:; when written in terms of 73:); specifically, it is the 71:Kullback–Leibler divergence 10: 9457: 9374:10.1103/PhysRevE.79.012104 8789:of the exponential map to 3866:discrete probability space 2560:{\displaystyle P(\theta )} 9030:10.1007/s41884-018-0006-4 8837:{\displaystyle p\in S(X)} 8778:{\displaystyle p\in S(X)} 8254:{\displaystyle T_{\mu }S} 8050:{\displaystyle \Omega =X} 7913:{\displaystyle \alpha =0} 5821:projective Hilbert spaces 5770:When the random variable 4545:while the metric becomes 3913:, parametrized by points 3872:restricted to a positive 3529:Jensen–Shannon divergence 3517:Cauchy–Schwarz inequality 2140:PoincarĂ© half-plane model 1686:be the precision matrix. 579:, as it would be for any 560:is now a coordinate on a 102:Fisher information matrix 25:Fisher information metric 8894: 8541:Radon–Nikodym derivative 8269:, one may write this as 8158:(with the sigma-algebra 7344:The imaginary term is a 3531:. Specifically, one has 3452:. Specifically, one has 2200:The geodesic connecting 1791:. The precision part is 1415:, so the metric is just 83:projective Hilbert space 9128:Physical Review Letters 8908:Nielsen, Frank (2023). 8662:{\displaystyle \theta } 8642:{\displaystyle \theta } 8622:{\displaystyle \theta } 8574:possess this property. 8171:{\displaystyle \Sigma } 5760:{\displaystyle \theta } 4842:{\displaystyle \theta } 2777:{\displaystyle \theta } 2158:{\displaystyle \sigma } 596:{\displaystyle \theta } 553:{\displaystyle \theta } 306:{\displaystyle \theta } 235:{\displaystyle \theta } 9182:Gromov, Misha (2013). 8858: 8838: 8803: 8779: 8744: 8706: 8663: 8643: 8623: 8603: 8556:Radon–Nikodym property 8525: 8501: 8445: 8418: 8388: 8255: 8222: 8172: 8148: 8110: 8109:{\displaystyle P=\mu } 8084: 8051: 8021: 7971: 7914: 7885: 7335: 7110: 7074: 7039: 7007: 6712: 6630: 6598: 6493: 6437: 6273: 6235: 6158: 6093: 6052: 6017: 5978: 5940: 5815:As Fubini–Study metric 5801:Radon–Nikodym property 5784: 5761: 5738: 5653: 5226: 4892: 4843: 4820: 4536: 4490: 4434: 4408: 4361: 4338: 4206: 4123: 4074: 4039: 4007: 3965: 3897: 3847: 3682: 3494: 3427: 3288:Change in free entropy 3258: 3237:at the extremum point 3231: 3184: 3183:{\displaystyle g_{jk}} 3150: 2938: 2905: 2854: 2778: 2758: 2725: 2597: 2561: 2516: 2457: 2393: 2248: 2191: 2159: 2132: 2051: 2001: 1861: 1785: 1722: 1680: 1644: 1493: 1444: 1409: 1370: 1185: 1054: 1012: 920: 691: 597: 554: 523: 365: 307: 287: 256: 236: 216: 181: 9431:Differential geometry 8859: 8839: 8804: 8780: 8745: 8707: 8664: 8644: 8624: 8604: 8531:over the whole space 8526: 8502: 8446: 8419: 8389: 8256: 8223: 8173: 8149: 8111: 8085: 8052: 8022: 7972: 7915: 7886: 7336: 7111: 7075: 7040: 7008: 6713: 6631: 6599: 6494: 6438: 6274: 6236: 6159: 6094: 6053: 6018: 5986:probability amplitude 5979: 5941: 5848:probability amplitude 5805:Radon–Nikodym theorem 5785: 5762: 5739: 5654: 5227: 4893: 4844: 4821: 4537: 4491: 4435: 4388: 4362: 4339: 4207: 4124: 4075: 4040: 3987: 3966: 3898: 3896:{\displaystyle R^{2}} 3848: 3683: 3495: 3428: 3259: 3232: 3185: 3160:The symmetric matrix 3151: 2939: 2906: 2855: 2779: 2759: 2726: 2598: 2562: 2517: 2458: 2394: 2249: 2192: 2160: 2133: 2052: 2002: 1862: 1786: 1723: 1681: 1645: 1494: 1445: 1410: 1371: 1186: 1055: 1013: 921: 692: 598: 555: 524: 366: 308: 288: 257: 237: 217: 182: 60:sufficient statistics 9441:Statistical distance 9436:Information geometry 9078:Journal of Physics A 9008:Information Geometry 8889:Information geometry 8857:{\displaystyle \mu } 8848: 8813: 8802:{\displaystyle \mu } 8793: 8754: 8716: 8680: 8653: 8633: 8613: 8602:{\displaystyle \mu } 8593: 8524:{\displaystyle \mu } 8515: 8455: 8428: 8401: 8276: 8235: 8197: 8162: 8147:{\displaystyle \mu } 8138: 8121:statistical manifold 8094: 8064: 8035: 7989: 7985:. Equivalently, let 7943: 7898: 7363: 7123: 7084: 7058: 7020: 6728: 6651: 6611: 6510: 6450: 6297: 6248: 6174: 6110: 6062: 6027: 5992: 5984:is a complex-valued 5953: 5861: 5831:, also known as the 5774: 5751: 5669: 5242: 4905: 4853: 4833: 4552: 4503: 4455: 4446:Lagrange multipliers 4385: 4351: 4223: 4140: 4092: 4052: 3978: 3917: 3880: 3876:(e.g. "quadrant" in 3706: 3691:where the integrand 3538: 3459: 3307: 3241: 3198: 3164: 2951: 2915: 2864: 2792: 2768: 2738: 2610: 2571: 2542: 2467: 2403: 2258: 2204: 2169: 2149: 2061: 2011: 1874: 1795: 1732: 1693: 1654: 1502: 1464: 1419: 1384: 1195: 1076: 1025: 936: 708: 634: 615:constraints holding 587: 544: 381: 317: 297: 277: 246: 226: 191: 120: 106:observed information 93:, it is the quantum 47:defined on a common 45:probability measures 33:statistical manifold 21:information geometry 9366:2009PhRvE..79a2104F 9254:2010PhLA..374.4801F 8936:2023Entrp..25..654N 7937:orientable manifold 6284:Fubini–Study metric 5825:Fubini–Study metric 5311: 4849:, that is, one has 4485: 4423: 4254: 3860:As Euclidean metric 3826: 3723: 3665: 3570: 3509:processing industry 3340: 3298:Riemannian manifold 3282:Gibbs distributions 1844: 1454:Normal distribution 1436: 605:Lagrange multiplier 87:Fubini–Study metric 9350:(1 Pt 1): 012104. 8884:Hellinger distance 8879:Fisher information 8854: 8834: 8799: 8787:parallel transport 8775: 8740: 8702: 8659: 8639: 8619: 8599: 8521: 8497: 8441: 8414: 8384: 8251: 8218: 8168: 8144: 8106: 8080: 8047: 8017: 7967: 7910: 7881: 7879: 7331: 7329: 7106: 7070: 7035: 7003: 7001: 6708: 6626: 6594: 6489: 6433: 6269: 6231: 6154: 6089: 6048: 6013: 5974: 5936: 5797:category-theoretic 5780: 5757: 5734: 5662:where, as before, 5649: 5647: 5401: 5277: 5222: 5220: 5073: 5063: 4941: 4888: 4839: 4816: 4814: 4749: 4683: 4618: 4578: 4532: 4515: 4486: 4471: 4430: 4409: 4357: 4334: 4226: 4202: 4119: 4118: 4070: 4069: 4035: 3961: 3893: 3843: 3812: 3709: 3678: 3651: 3556: 3490: 3423: 3326: 3254: 3227: 3180: 3146: 3063: 2934: 2901: 2850: 2774: 2754: 2721: 2659: 2593: 2557: 2512: 2453: 2389: 2244: 2187: 2155: 2128: 2047: 1997: 1991: 1939: 1857: 1830: 1781: 1718: 1676: 1640: 1489: 1440: 1422: 1405: 1378:natural parameters 1366: 1181: 1070:exponential family 1050: 1008: 916: 699:information theory 687: 625:partition function 593: 550: 519: 361: 303: 283: 252: 232: 212: 177: 56:Chentsov’s theorem 9344:Physical Review E 9238:(48): 4801–4803. 9232:Physics Letters A 9205:978-3-03719-120-0 8945:10.3390/e25040654 8560:square-integrable 8376: 8349: 8267:abuse of notation 8228:and consider the 8182:. The points of 8029:probability space 7870: 7837: 7807: 7780: 7737: 7711: 7671: 7627: 7600: 7545: 7512: 7469: 7443: 7418: 7289: 7148: 6931: 6763: 6686: 6428: 6358: 5905: 5852:polar coordinates 5783:{\displaystyle p} 5709: 5638: 5588: 5519: 5469: 5392: 5375: 5350: 5190: 5141: 5064: 5051: 5049: 4932: 4930: 4740: 4738: 4725: 4674: 4672: 4652: 4634: 4609: 4569: 4506: 4360:{\displaystyle y} 4311: 4286: 4180: 4116: 3841: 3810: 3793: 3791: 3751: 3636: 3596: 3415: 3366: 3324: 3051: 3049: 2702: 2650: 2481: 2451: 2448: 2344: 2309: 2185: 2126: 2033: 1828: 1614: 1551: 1338: 1278: 1173: 1113: 1048: 996: 907: 807: 609:expectation value 581:Markovian process 540:. The variable 489: 286:{\displaystyle x} 255:{\displaystyle x} 85:, it becomes the 49:probability space 43:whose points are 29:Riemannian metric 9448: 9393: 9359: 9318: 9317: 9315: 9289: 9280: 9274: 9273: 9247: 9227: 9218: 9217: 9179: 9170: 9169: 9143: 9123: 9112: 9111: 9093: 9073: 9067: 9066: 9048: 9042: 9041: 9023: 9003: 8997: 8996: 8974: 8968: 8967: 8957: 8947: 8929: 8905: 8874:CramĂ©r–Rao bound 8863: 8861: 8860: 8855: 8843: 8841: 8840: 8835: 8808: 8806: 8805: 8800: 8784: 8782: 8781: 8776: 8749: 8747: 8746: 8741: 8711: 8709: 8708: 8703: 8698: 8697: 8668: 8666: 8665: 8660: 8648: 8646: 8645: 8640: 8628: 8626: 8625: 8620: 8608: 8606: 8605: 8600: 8554:) must have the 8530: 8528: 8527: 8522: 8506: 8504: 8503: 8498: 8493: 8492: 8480: 8479: 8467: 8466: 8450: 8448: 8447: 8442: 8440: 8439: 8423: 8421: 8420: 8415: 8413: 8412: 8393: 8391: 8390: 8385: 8377: 8375: 8367: 8366: 8365: 8352: 8350: 8348: 8340: 8339: 8338: 8325: 8323: 8322: 8307: 8306: 8294: 8293: 8260: 8258: 8257: 8252: 8247: 8246: 8227: 8225: 8224: 8219: 8190:) are measures. 8177: 8175: 8174: 8169: 8153: 8151: 8150: 8145: 8115: 8113: 8112: 8107: 8090:and probability 8089: 8087: 8086: 8081: 8073: 8072: 8056: 8054: 8053: 8048: 8026: 8024: 8023: 8018: 8007: 8006: 7976: 7974: 7973: 7968: 7919: 7917: 7916: 7911: 7890: 7888: 7887: 7882: 7880: 7876: 7872: 7871: 7869: 7868: 7867: 7854: 7840: 7838: 7836: 7835: 7834: 7821: 7813: 7808: 7806: 7805: 7804: 7791: 7783: 7781: 7779: 7778: 7777: 7764: 7750: 7743: 7738: 7730: 7725: 7720: 7716: 7712: 7710: 7709: 7708: 7695: 7687: 7681: 7676: 7672: 7670: 7669: 7668: 7655: 7647: 7641: 7633: 7629: 7628: 7626: 7625: 7624: 7611: 7603: 7601: 7599: 7598: 7597: 7584: 7576: 7569: 7557: 7551: 7547: 7546: 7544: 7543: 7542: 7529: 7515: 7513: 7511: 7510: 7509: 7496: 7482: 7475: 7470: 7462: 7458: 7449: 7445: 7444: 7442: 7441: 7440: 7424: 7419: 7417: 7416: 7415: 7399: 7387: 7382: 7381: 7340: 7338: 7337: 7332: 7330: 7326: 7322: 7295: 7290: 7282: 7273: 7267: 7266: 7261: 7257: 7256: 7252: 7240: 7226: 7222: 7221: 7220: 7197: 7189: 7185: 7184: 7183: 7154: 7149: 7141: 7137: 7115: 7113: 7112: 7107: 7099: 7098: 7079: 7077: 7076: 7071: 7044: 7042: 7041: 7036: 7012: 7010: 7009: 7004: 7002: 6942: 6941: 6932: 6924: 6919: 6914: 6910: 6909: 6904: 6900: 6882: 6881: 6852: 6851: 6833: 6832: 6816: 6799: 6798: 6774: 6773: 6764: 6756: 6752: 6747: 6746: 6717: 6715: 6714: 6709: 6704: 6700: 6687: 6685: 6677: 6669: 6635: 6633: 6632: 6627: 6603: 6601: 6600: 6595: 6550: 6549: 6540: 6539: 6498: 6496: 6495: 6490: 6442: 6440: 6439: 6434: 6429: 6427: 6426: 6421: 6403: 6364: 6359: 6357: 6340: 6317: 6312: 6311: 6288:bra–ket notation 6278: 6276: 6275: 6270: 6240: 6238: 6237: 6232: 6217: 6216: 6186: 6185: 6163: 6161: 6160: 6155: 6122: 6121: 6098: 6096: 6095: 6090: 6057: 6055: 6054: 6049: 6022: 6020: 6019: 6014: 5983: 5981: 5980: 5975: 5945: 5943: 5942: 5937: 5935: 5934: 5906: 5886: 5789: 5787: 5786: 5781: 5766: 5764: 5763: 5758: 5743: 5741: 5740: 5735: 5730: 5729: 5714: 5710: 5708: 5707: 5706: 5690: 5684: 5683: 5658: 5656: 5655: 5650: 5648: 5644: 5640: 5639: 5637: 5636: 5635: 5622: 5612: 5611: 5592: 5589: 5587: 5586: 5585: 5572: 5562: 5561: 5542: 5535: 5524: 5520: 5518: 5517: 5516: 5503: 5493: 5492: 5473: 5470: 5468: 5467: 5466: 5453: 5443: 5442: 5423: 5411: 5410: 5400: 5385: 5381: 5377: 5376: 5374: 5373: 5372: 5356: 5351: 5349: 5348: 5347: 5331: 5310: 5309: 5288: 5261: 5260: 5231: 5229: 5228: 5223: 5221: 5217: 5216: 5204: 5203: 5191: 5189: 5188: 5187: 5174: 5164: 5163: 5144: 5142: 5140: 5139: 5138: 5125: 5115: 5114: 5095: 5083: 5082: 5072: 5062: 5050: 5042: 5034: 5018: 5017: 4983: 4982: 4951: 4950: 4940: 4931: 4923: 4897: 4895: 4894: 4889: 4878: 4877: 4865: 4864: 4848: 4846: 4845: 4840: 4825: 4823: 4822: 4817: 4815: 4808: 4807: 4782: 4781: 4759: 4758: 4748: 4739: 4731: 4726: 4724: 4723: 4714: 4713: 4712: 4699: 4698: 4685: 4682: 4673: 4665: 4657: 4653: 4651: 4650: 4641: 4635: 4633: 4632: 4623: 4617: 4605: 4604: 4591: 4590: 4577: 4541: 4539: 4538: 4533: 4525: 4524: 4514: 4495: 4493: 4492: 4487: 4484: 4479: 4467: 4466: 4439: 4437: 4436: 4431: 4422: 4417: 4407: 4402: 4366: 4364: 4363: 4358: 4343: 4341: 4340: 4335: 4333: 4332: 4317: 4313: 4312: 4310: 4309: 4308: 4292: 4287: 4285: 4284: 4283: 4267: 4253: 4252: 4237: 4211: 4209: 4208: 4203: 4201: 4200: 4185: 4181: 4179: 4178: 4177: 4161: 4155: 4154: 4128: 4126: 4125: 4120: 4117: 4115: 4114: 4113: 4097: 4079: 4077: 4076: 4071: 4068: 4067: 4044: 4042: 4041: 4036: 4034: 4033: 4020: 4019: 4006: 4001: 3970: 3968: 3967: 3962: 3957: 3956: 3938: 3937: 3912: 3902: 3900: 3899: 3894: 3892: 3891: 3870:Euclidean metric 3852: 3850: 3849: 3844: 3842: 3828: 3825: 3820: 3811: 3806: 3794: 3792: 3790: 3782: 3781: 3780: 3767: 3765: 3764: 3752: 3750: 3742: 3741: 3740: 3727: 3725: 3722: 3717: 3687: 3685: 3684: 3679: 3664: 3659: 3637: 3635: 3627: 3626: 3625: 3612: 3610: 3609: 3597: 3595: 3587: 3586: 3585: 3572: 3569: 3564: 3499: 3497: 3496: 3491: 3432: 3430: 3429: 3424: 3416: 3414: 3406: 3405: 3404: 3391: 3380: 3379: 3367: 3365: 3357: 3356: 3355: 3342: 3339: 3334: 3325: 3317: 3296:of a curve on a 3274:Ruppeiner metric 3263: 3261: 3260: 3255: 3253: 3252: 3236: 3234: 3233: 3228: 3217: 3216: 3215: 3214: 3194:of the function 3189: 3187: 3186: 3181: 3179: 3178: 3155: 3153: 3152: 3147: 3142: 3141: 3126: 3115: 3114: 3102: 3101: 3089: 3088: 3076: 3075: 3062: 3050: 3042: 3016: 3015: 2997: 2996: 2995: 2970: 2969: 2968: 2967: 2943: 2941: 2940: 2935: 2933: 2932: 2910: 2908: 2907: 2902: 2897: 2896: 2859: 2857: 2856: 2851: 2828: 2827: 2809: 2808: 2807: 2783: 2781: 2780: 2775: 2763: 2761: 2760: 2755: 2753: 2752: 2730: 2728: 2727: 2722: 2720: 2719: 2718: 2717: 2707: 2703: 2701: 2700: 2699: 2686: 2678: 2672: 2671: 2658: 2643: 2642: 2602: 2600: 2599: 2594: 2589: 2588: 2566: 2564: 2563: 2558: 2532:relative entropy 2521: 2519: 2518: 2513: 2505: 2482: 2477: 2462: 2460: 2459: 2454: 2452: 2450: 2449: 2444: 2438: 2437: 2436: 2424: 2423: 2413: 2398: 2396: 2395: 2390: 2388: 2384: 2377: 2376: 2367: 2366: 2345: 2340: 2339: 2338: 2326: 2325: 2315: 2310: 2305: 2304: 2303: 2291: 2290: 2280: 2273: 2272: 2253: 2251: 2250: 2245: 2243: 2242: 2241: 2240: 2223: 2222: 2221: 2220: 2196: 2194: 2193: 2188: 2186: 2181: 2179: 2164: 2162: 2161: 2156: 2137: 2135: 2134: 2129: 2127: 2125: 2124: 2115: 2114: 2113: 2098: 2097: 2084: 2076: 2075: 2056: 2054: 2053: 2048: 2034: 2029: 2027: 2006: 2004: 2003: 1998: 1996: 1995: 1960: 1959: 1944: 1943: 1936: 1935: 1923: 1922: 1866: 1864: 1863: 1858: 1843: 1838: 1829: 1821: 1813: 1812: 1790: 1788: 1787: 1782: 1780: 1779: 1764: 1763: 1762: 1761: 1749: 1748: 1727: 1725: 1724: 1719: 1711: 1710: 1685: 1683: 1682: 1677: 1675: 1674: 1649: 1647: 1646: 1641: 1615: 1607: 1587: 1586: 1574: 1573: 1552: 1544: 1527: 1498: 1496: 1495: 1490: 1473: 1472: 1449: 1447: 1446: 1441: 1435: 1430: 1414: 1412: 1411: 1406: 1380:. In this case, 1375: 1373: 1372: 1367: 1347: 1339: 1337: 1336: 1335: 1322: 1321: 1308: 1295: 1294: 1284: 1279: 1277: 1276: 1275: 1262: 1261: 1248: 1235: 1234: 1224: 1210: 1209: 1190: 1188: 1187: 1182: 1180: 1179: 1171: 1111: 1110: 1109: 1059: 1057: 1056: 1051: 1049: 1047: 1046: 1045: 1029: 1017: 1015: 1014: 1009: 1001: 997: 995: 994: 993: 980: 961: 949: 943: 925: 923: 922: 917: 912: 908: 906: 905: 904: 891: 890: 877: 858: 857: 847: 841: 808: 806: 805: 804: 791: 790: 777: 758: 757: 747: 745: 744: 723: 722: 696: 694: 693: 688: 668: 602: 600: 599: 594: 562:Riemann manifold 559: 557: 556: 551: 528: 526: 525: 520: 490: 488: 487: 486: 473: 472: 459: 434: 433: 423: 421: 420: 396: 395: 370: 368: 367: 362: 329: 328: 312: 310: 309: 304: 292: 290: 289: 284: 261: 259: 258: 253: 241: 239: 238: 233: 221: 219: 218: 213: 186: 184: 183: 178: 173: 172: 154: 153: 141: 140: 79:Euclidean metric 27:is a particular 9456: 9455: 9451: 9450: 9449: 9447: 9446: 9445: 9421: 9420: 9397:Shun'ichi Amari 9327: 9322: 9321: 9287: 9281: 9277: 9228: 9221: 9206: 9196:10.4171/120-1/4 9180: 9173: 9124: 9115: 9074: 9070: 9063: 9049: 9045: 9004: 9000: 8993: 8975: 8971: 8906: 8902: 8897: 8870: 8849: 8846: 8845: 8814: 8811: 8810: 8794: 8791: 8790: 8755: 8752: 8751: 8717: 8714: 8713: 8693: 8689: 8681: 8678: 8677: 8674:exponential map 8654: 8651: 8650: 8634: 8631: 8630: 8614: 8611: 8610: 8594: 8591: 8590: 8564:Cauchy sequence 8516: 8513: 8512: 8488: 8484: 8475: 8471: 8462: 8458: 8456: 8453: 8452: 8435: 8431: 8429: 8426: 8425: 8408: 8404: 8402: 8399: 8398: 8368: 8361: 8357: 8353: 8351: 8341: 8334: 8330: 8326: 8324: 8318: 8314: 8302: 8298: 8289: 8285: 8277: 8274: 8273: 8242: 8238: 8236: 8233: 8232: 8198: 8195: 8194: 8163: 8160: 8159: 8139: 8136: 8135: 8095: 8092: 8091: 8068: 8067: 8065: 8062: 8061: 8036: 8033: 8032: 8002: 8001: 7990: 7987: 7986: 7944: 7941: 7940: 7926: 7899: 7896: 7895: 7878: 7877: 7863: 7859: 7855: 7841: 7839: 7830: 7826: 7822: 7814: 7812: 7800: 7796: 7792: 7784: 7782: 7773: 7769: 7765: 7751: 7749: 7748: 7744: 7739: 7729: 7724: 7718: 7717: 7704: 7700: 7696: 7688: 7686: 7682: 7677: 7664: 7660: 7656: 7648: 7646: 7642: 7637: 7620: 7616: 7612: 7604: 7602: 7593: 7589: 7585: 7577: 7575: 7574: 7570: 7565: 7558: 7556: 7553: 7552: 7538: 7534: 7530: 7516: 7514: 7505: 7501: 7497: 7483: 7481: 7480: 7476: 7471: 7461: 7459: 7457: 7451: 7450: 7436: 7432: 7428: 7423: 7411: 7407: 7403: 7398: 7397: 7393: 7388: 7386: 7374: 7370: 7366: 7364: 7361: 7360: 7354:geometric phase 7346:symplectic form 7328: 7327: 7300: 7296: 7291: 7281: 7274: 7272: 7269: 7268: 7262: 7245: 7241: 7236: 7235: 7231: 7230: 7216: 7212: 7202: 7198: 7193: 7179: 7175: 7159: 7155: 7150: 7140: 7138: 7136: 7126: 7124: 7121: 7120: 7094: 7090: 7085: 7082: 7081: 7059: 7056: 7055: 7021: 7018: 7017: 7000: 6999: 6937: 6933: 6923: 6918: 6912: 6911: 6905: 6877: 6873: 6872: 6868: 6867: 6847: 6843: 6828: 6824: 6817: 6815: 6812: 6811: 6794: 6790: 6769: 6765: 6755: 6753: 6751: 6742: 6738: 6731: 6729: 6726: 6725: 6678: 6670: 6668: 6667: 6663: 6652: 6649: 6648: 6642:cotangent space 6612: 6609: 6608: 6607:The expression 6545: 6541: 6535: 6531: 6511: 6508: 6507: 6451: 6448: 6447: 6422: 6405: 6404: 6365: 6363: 6341: 6318: 6316: 6307: 6303: 6298: 6295: 6294: 6249: 6246: 6245: 6212: 6208: 6181: 6177: 6175: 6172: 6171: 6117: 6113: 6111: 6108: 6107: 6063: 6060: 6059: 6028: 6025: 6024: 5993: 5990: 5989: 5954: 5951: 5950: 5912: 5908: 5885: 5862: 5859: 5858: 5833:Helstrom metric 5817: 5803:, that is, the 5775: 5772: 5771: 5752: 5749: 5748: 5722: 5718: 5702: 5698: 5694: 5689: 5685: 5679: 5675: 5670: 5667: 5666: 5646: 5645: 5631: 5627: 5623: 5607: 5603: 5593: 5591: 5581: 5577: 5573: 5557: 5553: 5543: 5541: 5540: 5536: 5531: 5522: 5521: 5512: 5508: 5504: 5488: 5484: 5474: 5472: 5462: 5458: 5454: 5438: 5434: 5424: 5422: 5406: 5402: 5396: 5383: 5382: 5368: 5364: 5360: 5355: 5343: 5339: 5335: 5330: 5329: 5325: 5312: 5290: 5289: 5281: 5253: 5249: 5245: 5243: 5240: 5239: 5219: 5218: 5212: 5208: 5199: 5195: 5183: 5179: 5175: 5159: 5155: 5145: 5143: 5134: 5130: 5126: 5110: 5106: 5096: 5094: 5078: 5074: 5068: 5055: 5041: 5032: 5031: 5013: 5009: 4978: 4974: 4946: 4942: 4936: 4922: 4915: 4908: 4906: 4903: 4902: 4873: 4869: 4860: 4856: 4854: 4851: 4850: 4834: 4831: 4830: 4813: 4812: 4803: 4799: 4777: 4773: 4754: 4750: 4744: 4730: 4719: 4715: 4708: 4704: 4694: 4690: 4686: 4684: 4678: 4664: 4655: 4654: 4646: 4642: 4640: 4628: 4624: 4622: 4613: 4600: 4596: 4586: 4582: 4573: 4562: 4555: 4553: 4550: 4549: 4520: 4516: 4510: 4504: 4501: 4500: 4480: 4475: 4462: 4458: 4456: 4453: 4452: 4418: 4413: 4403: 4392: 4386: 4383: 4382: 4352: 4349: 4348: 4325: 4321: 4304: 4300: 4296: 4291: 4279: 4275: 4271: 4266: 4265: 4261: 4239: 4238: 4230: 4224: 4221: 4220: 4193: 4189: 4173: 4169: 4165: 4160: 4156: 4150: 4146: 4141: 4138: 4137: 4109: 4105: 4101: 4096: 4093: 4090: 4089: 4086:cotangent space 4063: 4059: 4053: 4050: 4049: 4029: 4025: 4015: 4011: 4002: 3991: 3979: 3976: 3975: 3952: 3948: 3933: 3929: 3918: 3915: 3914: 3907: 3887: 3883: 3881: 3878: 3877: 3862: 3827: 3821: 3816: 3805: 3783: 3776: 3772: 3768: 3766: 3757: 3753: 3743: 3736: 3732: 3728: 3726: 3724: 3718: 3713: 3707: 3704: 3703: 3660: 3655: 3628: 3621: 3617: 3613: 3611: 3602: 3598: 3588: 3581: 3577: 3573: 3571: 3565: 3560: 3539: 3536: 3535: 3525: 3460: 3457: 3456: 3407: 3400: 3396: 3392: 3390: 3372: 3368: 3358: 3351: 3347: 3343: 3341: 3335: 3330: 3316: 3308: 3305: 3304: 3290: 3278:Weinhold metric 3270: 3248: 3244: 3242: 3239: 3238: 3210: 3206: 3205: 3201: 3199: 3196: 3195: 3171: 3167: 3165: 3162: 3161: 3137: 3133: 3122: 3110: 3106: 3094: 3090: 3084: 3080: 3071: 3067: 3055: 3041: 3011: 3007: 2988: 2987: 2983: 2963: 2959: 2958: 2954: 2952: 2949: 2948: 2928: 2924: 2916: 2913: 2912: 2892: 2888: 2865: 2862: 2861: 2823: 2819: 2800: 2799: 2795: 2793: 2790: 2789: 2769: 2766: 2765: 2748: 2744: 2739: 2736: 2735: 2713: 2709: 2708: 2695: 2691: 2687: 2679: 2677: 2674: 2673: 2667: 2663: 2654: 2638: 2634: 2611: 2608: 2607: 2584: 2580: 2572: 2569: 2568: 2543: 2540: 2539: 2528: 2501: 2476: 2468: 2465: 2464: 2443: 2439: 2432: 2428: 2419: 2415: 2414: 2412: 2404: 2401: 2400: 2372: 2368: 2362: 2358: 2334: 2330: 2321: 2317: 2316: 2314: 2299: 2295: 2286: 2282: 2281: 2279: 2278: 2274: 2268: 2267: 2259: 2256: 2255: 2236: 2232: 2231: 2227: 2216: 2212: 2211: 2207: 2205: 2202: 2201: 2180: 2175: 2170: 2167: 2166: 2150: 2147: 2146: 2120: 2116: 2109: 2105: 2093: 2089: 2085: 2083: 2071: 2067: 2062: 2059: 2058: 2028: 2023: 2012: 2009: 2008: 1990: 1989: 1984: 1978: 1977: 1972: 1962: 1961: 1952: 1948: 1938: 1937: 1928: 1924: 1918: 1914: 1906: 1900: 1899: 1894: 1884: 1883: 1875: 1872: 1871: 1839: 1834: 1820: 1802: 1798: 1796: 1793: 1792: 1772: 1768: 1757: 1753: 1744: 1740: 1739: 1735: 1733: 1730: 1729: 1700: 1696: 1694: 1691: 1690: 1667: 1663: 1655: 1652: 1651: 1606: 1579: 1575: 1569: 1565: 1543: 1523: 1503: 1500: 1499: 1468: 1467: 1465: 1462: 1461: 1456: 1431: 1426: 1420: 1417: 1416: 1385: 1382: 1381: 1343: 1331: 1327: 1317: 1313: 1309: 1290: 1286: 1285: 1283: 1271: 1267: 1257: 1253: 1249: 1230: 1226: 1225: 1223: 1202: 1198: 1196: 1193: 1192: 1175: 1174: 1105: 1104: 1077: 1074: 1073: 1066: 1060:on both sides. 1041: 1037: 1033: 1028: 1026: 1023: 1022: 989: 985: 981: 960: 950: 948: 944: 939: 937: 934: 933: 900: 896: 886: 882: 878: 853: 849: 848: 846: 842: 837: 800: 796: 786: 782: 778: 753: 749: 748: 746: 740: 736: 715: 711: 709: 706: 705: 667: 635: 632: 631: 588: 585: 584: 545: 542: 541: 482: 478: 468: 464: 460: 429: 425: 424: 422: 416: 412: 388: 384: 382: 379: 378: 324: 320: 318: 315: 314: 298: 295: 294: 278: 275: 274: 268:random variable 247: 244: 243: 227: 224: 223: 192: 189: 188: 168: 164: 149: 145: 136: 132: 121: 118: 117: 114: 41:smooth manifold 17: 12: 11: 5: 9454: 9444: 9443: 9438: 9433: 9419: 9418: 9411: 9404: 9394: 9338: 9337: 9326: 9323: 9320: 9319: 9298:(4): 347–356. 9275: 9219: 9204: 9171: 9134:(10): 100602. 9113: 9068: 9061: 9043: 9014:(1): 117–135. 8998: 8991: 8969: 8899: 8898: 8896: 8893: 8892: 8891: 8886: 8881: 8876: 8869: 8866: 8853: 8833: 8830: 8827: 8824: 8821: 8818: 8798: 8774: 8771: 8768: 8765: 8762: 8759: 8739: 8736: 8733: 8730: 8727: 8724: 8721: 8701: 8696: 8692: 8688: 8685: 8658: 8638: 8618: 8598: 8572:Hilbert spaces 8537:measure theory 8520: 8496: 8491: 8487: 8483: 8478: 8474: 8470: 8465: 8461: 8438: 8434: 8411: 8407: 8395: 8394: 8383: 8380: 8374: 8371: 8364: 8360: 8356: 8347: 8344: 8337: 8333: 8329: 8321: 8317: 8313: 8310: 8305: 8301: 8297: 8292: 8288: 8284: 8281: 8250: 8245: 8241: 8217: 8214: 8211: 8208: 8205: 8202: 8167: 8143: 8105: 8102: 8099: 8079: 8076: 8071: 8046: 8043: 8040: 8016: 8013: 8010: 8005: 8000: 7997: 7994: 7966: 7963: 7960: 7957: 7954: 7951: 7948: 7925: 7922: 7909: 7906: 7903: 7892: 7891: 7875: 7866: 7862: 7858: 7853: 7850: 7847: 7844: 7833: 7829: 7825: 7820: 7817: 7811: 7803: 7799: 7795: 7790: 7787: 7776: 7772: 7768: 7763: 7760: 7757: 7754: 7747: 7742: 7736: 7733: 7728: 7723: 7721: 7719: 7715: 7707: 7703: 7699: 7694: 7691: 7685: 7680: 7675: 7667: 7663: 7659: 7654: 7651: 7645: 7640: 7636: 7632: 7623: 7619: 7615: 7610: 7607: 7596: 7592: 7588: 7583: 7580: 7573: 7568: 7564: 7561: 7559: 7555: 7554: 7550: 7541: 7537: 7533: 7528: 7525: 7522: 7519: 7508: 7504: 7500: 7495: 7492: 7489: 7486: 7479: 7474: 7468: 7465: 7460: 7456: 7453: 7452: 7448: 7439: 7435: 7431: 7427: 7422: 7414: 7410: 7406: 7402: 7396: 7392: 7389: 7385: 7380: 7377: 7373: 7369: 7368: 7342: 7341: 7325: 7321: 7318: 7315: 7312: 7309: 7306: 7303: 7299: 7294: 7288: 7285: 7280: 7277: 7275: 7271: 7270: 7265: 7260: 7255: 7251: 7248: 7244: 7239: 7234: 7229: 7225: 7219: 7215: 7211: 7208: 7205: 7201: 7196: 7192: 7188: 7182: 7178: 7174: 7171: 7168: 7165: 7162: 7158: 7153: 7147: 7144: 7139: 7135: 7132: 7129: 7128: 7105: 7102: 7097: 7093: 7089: 7069: 7066: 7063: 7050:acting on the 7034: 7031: 7028: 7025: 7014: 7013: 6998: 6995: 6991: 6987: 6984: 6981: 6978: 6975: 6972: 6969: 6966: 6963: 6960: 6957: 6954: 6951: 6948: 6945: 6940: 6936: 6930: 6927: 6922: 6917: 6915: 6913: 6908: 6903: 6899: 6896: 6892: 6888: 6885: 6880: 6876: 6871: 6866: 6863: 6860: 6856: 6850: 6846: 6842: 6839: 6836: 6831: 6827: 6823: 6820: 6818: 6814: 6813: 6810: 6807: 6803: 6797: 6793: 6789: 6786: 6783: 6780: 6777: 6772: 6768: 6762: 6759: 6754: 6750: 6745: 6741: 6737: 6734: 6733: 6719: 6718: 6707: 6703: 6699: 6696: 6693: 6690: 6684: 6681: 6676: 6673: 6666: 6662: 6659: 6656: 6625: 6622: 6619: 6616: 6605: 6604: 6593: 6590: 6587: 6583: 6580: 6577: 6574: 6571: 6568: 6565: 6562: 6559: 6556: 6553: 6548: 6544: 6538: 6534: 6530: 6527: 6524: 6521: 6518: 6515: 6503:is written as 6488: 6485: 6482: 6479: 6476: 6473: 6470: 6467: 6464: 6461: 6458: 6455: 6444: 6443: 6432: 6425: 6420: 6417: 6414: 6411: 6408: 6402: 6399: 6396: 6393: 6390: 6387: 6383: 6380: 6377: 6374: 6371: 6368: 6362: 6356: 6353: 6350: 6347: 6344: 6339: 6336: 6333: 6330: 6327: 6324: 6321: 6315: 6310: 6306: 6302: 6268: 6265: 6262: 6259: 6256: 6253: 6242: 6241: 6230: 6227: 6224: 6221: 6215: 6211: 6207: 6204: 6201: 6198: 6195: 6192: 6189: 6184: 6180: 6165: 6164: 6153: 6150: 6147: 6144: 6140: 6137: 6134: 6131: 6128: 6125: 6120: 6116: 6103:, namely that 6088: 6085: 6082: 6079: 6076: 6073: 6070: 6067: 6047: 6044: 6041: 6038: 6035: 6032: 6012: 6009: 6006: 6003: 6000: 5997: 5973: 5970: 5967: 5964: 5961: 5958: 5947: 5946: 5933: 5930: 5927: 5924: 5921: 5918: 5915: 5911: 5904: 5901: 5898: 5895: 5892: 5889: 5884: 5881: 5878: 5875: 5872: 5869: 5866: 5816: 5813: 5809:Hilbert spaces 5795:, is to use a 5779: 5756: 5745: 5744: 5733: 5728: 5725: 5721: 5717: 5713: 5705: 5701: 5697: 5693: 5688: 5682: 5678: 5674: 5660: 5659: 5643: 5634: 5630: 5626: 5621: 5618: 5615: 5610: 5606: 5602: 5599: 5596: 5584: 5580: 5576: 5571: 5568: 5565: 5560: 5556: 5552: 5549: 5546: 5539: 5534: 5530: 5527: 5525: 5523: 5515: 5511: 5507: 5502: 5499: 5496: 5491: 5487: 5483: 5480: 5477: 5465: 5461: 5457: 5452: 5449: 5446: 5441: 5437: 5433: 5430: 5427: 5420: 5417: 5414: 5409: 5405: 5399: 5395: 5391: 5388: 5386: 5384: 5380: 5371: 5367: 5363: 5359: 5354: 5346: 5342: 5338: 5334: 5328: 5324: 5321: 5318: 5315: 5313: 5308: 5305: 5302: 5299: 5296: 5293: 5287: 5284: 5280: 5276: 5273: 5270: 5267: 5264: 5259: 5256: 5252: 5248: 5247: 5233: 5232: 5215: 5211: 5207: 5202: 5198: 5194: 5186: 5182: 5178: 5173: 5170: 5167: 5162: 5158: 5154: 5151: 5148: 5137: 5133: 5129: 5124: 5121: 5118: 5113: 5109: 5105: 5102: 5099: 5092: 5089: 5086: 5081: 5077: 5071: 5067: 5061: 5058: 5054: 5048: 5045: 5040: 5037: 5035: 5033: 5030: 5027: 5024: 5021: 5016: 5012: 5008: 5005: 5002: 4999: 4995: 4992: 4989: 4986: 4981: 4977: 4973: 4970: 4967: 4964: 4960: 4957: 4954: 4949: 4945: 4939: 4935: 4929: 4926: 4921: 4918: 4916: 4914: 4911: 4910: 4887: 4884: 4881: 4876: 4872: 4868: 4863: 4859: 4838: 4827: 4826: 4811: 4806: 4802: 4798: 4795: 4792: 4789: 4785: 4780: 4776: 4772: 4769: 4766: 4763: 4757: 4753: 4747: 4743: 4737: 4734: 4729: 4722: 4718: 4711: 4707: 4703: 4697: 4693: 4689: 4681: 4677: 4671: 4668: 4663: 4660: 4658: 4656: 4649: 4645: 4639: 4631: 4627: 4621: 4616: 4612: 4608: 4603: 4599: 4595: 4589: 4585: 4581: 4576: 4572: 4568: 4565: 4563: 4561: 4558: 4557: 4543: 4542: 4531: 4528: 4523: 4519: 4513: 4509: 4483: 4478: 4474: 4470: 4465: 4461: 4441: 4440: 4429: 4426: 4421: 4416: 4412: 4406: 4401: 4398: 4395: 4391: 4356: 4345: 4344: 4331: 4328: 4324: 4320: 4316: 4307: 4303: 4299: 4295: 4290: 4282: 4278: 4274: 4270: 4264: 4260: 4257: 4251: 4248: 4245: 4242: 4236: 4233: 4229: 4214: 4213: 4199: 4196: 4192: 4188: 4184: 4176: 4172: 4168: 4164: 4159: 4153: 4149: 4145: 4112: 4108: 4104: 4100: 4066: 4062: 4058: 4046: 4045: 4032: 4028: 4024: 4018: 4014: 4010: 4005: 4000: 3997: 3994: 3990: 3986: 3983: 3960: 3955: 3951: 3947: 3944: 3941: 3936: 3932: 3928: 3925: 3922: 3890: 3886: 3861: 3858: 3854: 3853: 3840: 3837: 3834: 3831: 3824: 3819: 3815: 3809: 3804: 3801: 3798: 3789: 3786: 3779: 3775: 3771: 3763: 3760: 3756: 3749: 3746: 3739: 3735: 3731: 3721: 3716: 3712: 3689: 3688: 3677: 3674: 3671: 3668: 3663: 3658: 3654: 3650: 3647: 3644: 3641: 3634: 3631: 3624: 3620: 3616: 3608: 3605: 3601: 3594: 3591: 3584: 3580: 3576: 3568: 3563: 3559: 3555: 3552: 3549: 3546: 3543: 3524: 3521: 3501: 3500: 3488: 3485: 3482: 3479: 3476: 3473: 3470: 3467: 3464: 3434: 3433: 3422: 3419: 3413: 3410: 3403: 3399: 3395: 3389: 3386: 3383: 3378: 3375: 3371: 3364: 3361: 3354: 3350: 3346: 3338: 3333: 3329: 3323: 3320: 3315: 3312: 3289: 3286: 3269: 3266: 3251: 3247: 3226: 3223: 3220: 3213: 3209: 3204: 3192:Hessian matrix 3177: 3174: 3170: 3158: 3157: 3145: 3140: 3136: 3132: 3129: 3125: 3121: 3118: 3113: 3109: 3105: 3100: 3097: 3093: 3087: 3083: 3079: 3074: 3070: 3066: 3061: 3058: 3054: 3048: 3045: 3040: 3037: 3034: 3031: 3028: 3025: 3022: 3019: 3014: 3010: 3006: 3003: 3000: 2994: 2991: 2986: 2982: 2979: 2976: 2973: 2966: 2962: 2957: 2931: 2927: 2923: 2920: 2900: 2895: 2891: 2887: 2884: 2881: 2878: 2875: 2872: 2869: 2849: 2846: 2843: 2840: 2837: 2834: 2831: 2826: 2822: 2818: 2815: 2812: 2806: 2803: 2798: 2773: 2751: 2747: 2743: 2732: 2731: 2716: 2712: 2706: 2698: 2694: 2690: 2685: 2682: 2676: 2670: 2666: 2662: 2657: 2653: 2649: 2646: 2641: 2637: 2633: 2630: 2627: 2624: 2621: 2618: 2615: 2592: 2587: 2583: 2579: 2576: 2556: 2553: 2550: 2547: 2527: 2524: 2511: 2508: 2504: 2500: 2497: 2494: 2491: 2488: 2485: 2480: 2475: 2472: 2447: 2442: 2435: 2431: 2427: 2422: 2418: 2411: 2408: 2387: 2383: 2380: 2375: 2371: 2365: 2361: 2357: 2354: 2351: 2348: 2343: 2337: 2333: 2329: 2324: 2320: 2313: 2308: 2302: 2298: 2294: 2289: 2285: 2277: 2271: 2266: 2263: 2239: 2235: 2230: 2226: 2219: 2215: 2210: 2184: 2178: 2174: 2154: 2138:. This is the 2123: 2119: 2112: 2108: 2104: 2101: 2096: 2092: 2088: 2082: 2079: 2074: 2070: 2066: 2046: 2043: 2040: 2037: 2032: 2026: 2022: 2019: 2016: 1994: 1988: 1985: 1983: 1980: 1979: 1976: 1973: 1971: 1968: 1967: 1965: 1958: 1955: 1951: 1947: 1942: 1934: 1931: 1927: 1921: 1917: 1913: 1910: 1907: 1905: 1902: 1901: 1898: 1895: 1893: 1890: 1889: 1887: 1882: 1879: 1856: 1853: 1850: 1847: 1842: 1837: 1833: 1827: 1824: 1819: 1816: 1811: 1808: 1805: 1801: 1778: 1775: 1771: 1767: 1760: 1756: 1752: 1747: 1743: 1738: 1717: 1714: 1709: 1706: 1703: 1699: 1673: 1670: 1666: 1662: 1659: 1639: 1636: 1633: 1630: 1627: 1624: 1621: 1618: 1613: 1610: 1605: 1602: 1599: 1596: 1593: 1590: 1585: 1582: 1578: 1572: 1568: 1564: 1561: 1558: 1555: 1550: 1547: 1542: 1539: 1536: 1533: 1530: 1526: 1522: 1519: 1516: 1513: 1510: 1507: 1488: 1485: 1482: 1479: 1476: 1471: 1455: 1452: 1439: 1434: 1429: 1425: 1404: 1401: 1398: 1395: 1392: 1389: 1365: 1362: 1359: 1356: 1353: 1350: 1346: 1342: 1334: 1330: 1326: 1320: 1316: 1312: 1307: 1304: 1301: 1298: 1293: 1289: 1282: 1274: 1270: 1266: 1260: 1256: 1252: 1247: 1244: 1241: 1238: 1233: 1229: 1222: 1219: 1216: 1213: 1208: 1205: 1201: 1191:The metric is 1178: 1170: 1167: 1164: 1161: 1158: 1155: 1152: 1149: 1146: 1143: 1140: 1137: 1134: 1131: 1128: 1125: 1122: 1119: 1116: 1108: 1102: 1099: 1096: 1093: 1090: 1087: 1084: 1081: 1065: 1062: 1044: 1040: 1036: 1032: 1019: 1018: 1007: 1004: 1000: 992: 988: 984: 979: 976: 973: 970: 967: 964: 959: 956: 953: 947: 942: 927: 926: 915: 911: 903: 899: 895: 889: 885: 881: 876: 873: 870: 867: 864: 861: 856: 852: 845: 840: 836: 833: 830: 826: 823: 820: 817: 814: 811: 803: 799: 795: 789: 785: 781: 776: 773: 770: 767: 764: 761: 756: 752: 743: 739: 735: 732: 729: 726: 721: 718: 714: 686: 683: 680: 677: 674: 671: 666: 663: 660: 657: 654: 651: 648: 645: 642: 639: 592: 564:. The labels 549: 530: 529: 518: 515: 512: 508: 505: 502: 499: 496: 493: 485: 481: 477: 471: 467: 463: 458: 455: 452: 449: 446: 443: 440: 437: 432: 428: 419: 415: 411: 408: 405: 402: 399: 394: 391: 387: 360: 357: 354: 351: 347: 344: 341: 338: 335: 332: 327: 323: 302: 282: 251: 231: 211: 208: 205: 202: 199: 196: 176: 171: 167: 163: 160: 157: 152: 148: 144: 139: 135: 131: 128: 125: 113: 110: 15: 9: 6: 4: 3: 2: 9453: 9442: 9439: 9437: 9434: 9432: 9429: 9428: 9426: 9416: 9412: 9409: 9405: 9402: 9398: 9395: 9391: 9387: 9383: 9379: 9375: 9371: 9367: 9363: 9358: 9353: 9349: 9345: 9340: 9339: 9336: 9333: 9329: 9328: 9314: 9309: 9305: 9301: 9297: 9293: 9286: 9279: 9271: 9267: 9263: 9259: 9255: 9251: 9246: 9241: 9237: 9233: 9226: 9224: 9215: 9211: 9207: 9201: 9197: 9193: 9189: 9185: 9178: 9176: 9167: 9163: 9159: 9155: 9151: 9147: 9142: 9137: 9133: 9129: 9122: 9120: 9118: 9109: 9105: 9101: 9097: 9092: 9087: 9084:(2): 023001. 9083: 9079: 9072: 9064: 9062:0-471-24195-4 9058: 9054: 9047: 9039: 9035: 9031: 9027: 9022: 9017: 9013: 9009: 9002: 8994: 8992:0-8218-0531-2 8988: 8984: 8980: 8973: 8965: 8961: 8956: 8951: 8946: 8941: 8937: 8933: 8928: 8923: 8919: 8915: 8911: 8904: 8900: 8890: 8887: 8885: 8882: 8880: 8877: 8875: 8872: 8871: 8865: 8851: 8828: 8822: 8819: 8816: 8796: 8788: 8769: 8763: 8760: 8757: 8734: 8728: 8725: 8722: 8719: 8699: 8694: 8690: 8686: 8683: 8675: 8670: 8656: 8636: 8616: 8596: 8588: 8584: 8580: 8575: 8573: 8569: 8568:weak topology 8565: 8561: 8557: 8553: 8549: 8544: 8542: 8538: 8534: 8518: 8510: 8494: 8489: 8485: 8481: 8476: 8472: 8468: 8463: 8459: 8436: 8432: 8409: 8405: 8381: 8378: 8372: 8369: 8362: 8358: 8354: 8345: 8342: 8335: 8331: 8327: 8319: 8315: 8311: 8303: 8299: 8295: 8290: 8286: 8279: 8272: 8271: 8270: 8268: 8264: 8263:inner product 8248: 8243: 8239: 8231: 8230:tangent space 8212: 8206: 8203: 8200: 8193:Pick a point 8191: 8189: 8185: 8181: 8180:FrĂ©chet space 8157: 8141: 8133: 8129: 8125: 8122: 8117: 8103: 8100: 8097: 8074: 8060: 8059:sigma algebra 8044: 8041: 8030: 8011: 8008: 7998: 7984: 7980: 7961: 7958: 7952: 7949: 7938: 7934: 7929: 7921: 7907: 7904: 7901: 7873: 7864: 7860: 7851: 7848: 7845: 7831: 7827: 7818: 7809: 7801: 7797: 7788: 7774: 7770: 7761: 7758: 7755: 7745: 7734: 7731: 7726: 7722: 7713: 7705: 7701: 7692: 7683: 7673: 7665: 7661: 7652: 7643: 7634: 7630: 7621: 7617: 7608: 7594: 7590: 7581: 7571: 7562: 7560: 7548: 7539: 7535: 7526: 7523: 7520: 7506: 7502: 7493: 7490: 7487: 7477: 7466: 7463: 7454: 7446: 7437: 7433: 7420: 7412: 7408: 7394: 7390: 7383: 7378: 7375: 7371: 7359: 7358: 7357: 7355: 7351: 7347: 7323: 7319: 7316: 7313: 7310: 7307: 7304: 7301: 7297: 7286: 7283: 7278: 7276: 7263: 7258: 7253: 7249: 7246: 7242: 7232: 7227: 7223: 7217: 7209: 7206: 7199: 7190: 7186: 7180: 7172: 7169: 7166: 7163: 7156: 7145: 7142: 7133: 7130: 7119: 7118: 7117: 7103: 7095: 7091: 7087: 7067: 7061: 7053: 7052:tangent space 7049: 7032: 7029: 7026: 7023: 6996: 6993: 6989: 6982: 6979: 6976: 6973: 6970: 6967: 6964: 6961: 6958: 6955: 6952: 6949: 6946: 6938: 6934: 6928: 6925: 6920: 6916: 6906: 6901: 6897: 6894: 6890: 6886: 6883: 6878: 6874: 6869: 6864: 6861: 6858: 6854: 6848: 6840: 6837: 6829: 6825: 6821: 6819: 6808: 6805: 6801: 6795: 6787: 6784: 6781: 6778: 6770: 6766: 6760: 6757: 6748: 6743: 6739: 6735: 6724: 6723: 6722: 6705: 6701: 6697: 6694: 6691: 6688: 6682: 6679: 6674: 6671: 6664: 6660: 6657: 6654: 6647: 6646: 6645: 6643: 6639: 6620: 6617: 6591: 6588: 6585: 6578: 6575: 6572: 6566: 6560: 6557: 6554: 6546: 6542: 6536: 6532: 6528: 6522: 6519: 6516: 6506: 6505: 6504: 6502: 6483: 6480: 6477: 6471: 6468: 6462: 6459: 6456: 6430: 6423: 6415: 6412: 6409: 6397: 6394: 6391: 6388: 6378: 6375: 6372: 6369: 6360: 6351: 6348: 6345: 6334: 6331: 6328: 6325: 6322: 6313: 6308: 6304: 6300: 6293: 6292: 6291: 6289: 6285: 6280: 6263: 6260: 6257: 6251: 6228: 6225: 6222: 6219: 6213: 6202: 6199: 6196: 6190: 6182: 6178: 6170: 6169: 6168: 6151: 6148: 6145: 6142: 6135: 6132: 6129: 6123: 6118: 6114: 6106: 6105: 6104: 6102: 6086: 6083: 6077: 6074: 6071: 6065: 6042: 6039: 6036: 6030: 6007: 6004: 6001: 5995: 5987: 5968: 5965: 5962: 5956: 5928: 5925: 5922: 5916: 5913: 5909: 5899: 5896: 5893: 5887: 5882: 5876: 5873: 5870: 5864: 5857: 5856: 5855: 5853: 5850:, written in 5849: 5844: 5842: 5838: 5834: 5830: 5826: 5822: 5812: 5810: 5806: 5802: 5798: 5794: 5777: 5768: 5754: 5731: 5726: 5723: 5719: 5715: 5711: 5703: 5699: 5686: 5680: 5676: 5672: 5665: 5664: 5663: 5641: 5632: 5628: 5616: 5608: 5604: 5600: 5597: 5582: 5578: 5566: 5558: 5554: 5550: 5547: 5537: 5528: 5526: 5513: 5509: 5497: 5489: 5485: 5481: 5478: 5463: 5459: 5447: 5439: 5435: 5431: 5428: 5415: 5407: 5403: 5397: 5393: 5389: 5387: 5378: 5369: 5365: 5352: 5344: 5340: 5326: 5322: 5319: 5316: 5314: 5285: 5282: 5278: 5274: 5271: 5265: 5257: 5254: 5250: 5238: 5237: 5236: 5213: 5209: 5205: 5200: 5196: 5192: 5184: 5180: 5168: 5160: 5156: 5152: 5149: 5135: 5131: 5119: 5111: 5107: 5103: 5100: 5087: 5079: 5075: 5069: 5065: 5059: 5056: 5052: 5046: 5043: 5038: 5036: 5022: 5014: 5010: 5006: 5003: 4997: 4987: 4979: 4975: 4971: 4968: 4962: 4955: 4947: 4943: 4937: 4933: 4927: 4924: 4919: 4917: 4912: 4901: 4900: 4899: 4882: 4874: 4870: 4866: 4861: 4857: 4836: 4804: 4800: 4796: 4793: 4787: 4778: 4774: 4770: 4767: 4761: 4755: 4751: 4745: 4741: 4735: 4732: 4727: 4720: 4716: 4709: 4705: 4701: 4695: 4691: 4687: 4679: 4675: 4669: 4666: 4661: 4659: 4647: 4643: 4637: 4629: 4625: 4619: 4614: 4610: 4606: 4601: 4597: 4593: 4587: 4583: 4579: 4574: 4570: 4566: 4564: 4559: 4548: 4547: 4546: 4529: 4526: 4521: 4517: 4511: 4507: 4499: 4498: 4497: 4481: 4476: 4472: 4468: 4463: 4459: 4449: 4447: 4444:technique of 4427: 4424: 4419: 4414: 4410: 4404: 4399: 4396: 4393: 4389: 4381: 4380: 4379: 4377: 4373: 4368: 4354: 4329: 4326: 4322: 4318: 4314: 4305: 4301: 4288: 4280: 4276: 4262: 4258: 4255: 4234: 4231: 4227: 4219: 4218: 4217: 4197: 4194: 4190: 4186: 4182: 4174: 4170: 4157: 4151: 4147: 4143: 4136: 4135: 4134: 4132: 4131:tangent space 4110: 4106: 4087: 4083: 4064: 4060: 4056: 4030: 4026: 4022: 4016: 4012: 4008: 4003: 3998: 3995: 3992: 3988: 3984: 3981: 3974: 3973: 3972: 3953: 3949: 3945: 3942: 3939: 3934: 3930: 3923: 3920: 3910: 3904: 3888: 3884: 3875: 3871: 3867: 3857: 3838: 3835: 3832: 3829: 3822: 3817: 3813: 3807: 3802: 3799: 3796: 3787: 3777: 3773: 3761: 3758: 3754: 3747: 3737: 3733: 3719: 3714: 3710: 3702: 3701: 3700: 3698: 3694: 3675: 3672: 3669: 3666: 3661: 3656: 3652: 3648: 3645: 3642: 3639: 3632: 3622: 3618: 3606: 3603: 3599: 3592: 3582: 3578: 3566: 3561: 3557: 3550: 3547: 3544: 3534: 3533: 3532: 3530: 3520: 3518: 3514: 3510: 3506: 3486: 3480: 3477: 3474: 3468: 3465: 3455: 3454: 3453: 3451: 3447: 3443: 3439: 3420: 3417: 3411: 3401: 3397: 3384: 3376: 3373: 3369: 3362: 3352: 3348: 3336: 3331: 3327: 3321: 3318: 3313: 3310: 3303: 3302: 3301: 3299: 3295: 3285: 3283: 3279: 3275: 3265: 3249: 3245: 3221: 3211: 3207: 3202: 3193: 3175: 3172: 3168: 3138: 3134: 3119: 3111: 3107: 3098: 3095: 3091: 3085: 3081: 3072: 3068: 3059: 3056: 3052: 3046: 3043: 3038: 3029: 3023: 3012: 3008: 3001: 2984: 2980: 2974: 2964: 2960: 2955: 2947: 2946: 2945: 2929: 2925: 2921: 2918: 2893: 2889: 2882: 2879: 2873: 2867: 2841: 2835: 2824: 2820: 2813: 2796: 2787: 2771: 2749: 2745: 2714: 2710: 2704: 2696: 2692: 2683: 2668: 2664: 2655: 2651: 2647: 2639: 2635: 2628: 2625: 2619: 2613: 2606: 2605: 2604: 2585: 2581: 2574: 2551: 2545: 2537: 2533: 2523: 2506: 2502: 2498: 2492: 2489: 2486: 2483: 2478: 2473: 2470: 2445: 2440: 2433: 2429: 2425: 2420: 2416: 2409: 2406: 2385: 2381: 2378: 2373: 2369: 2363: 2359: 2355: 2352: 2349: 2346: 2341: 2335: 2331: 2327: 2322: 2318: 2311: 2306: 2300: 2296: 2292: 2287: 2283: 2275: 2261: 2237: 2233: 2228: 2224: 2217: 2213: 2208: 2198: 2182: 2176: 2172: 2152: 2143: 2141: 2121: 2117: 2110: 2106: 2102: 2099: 2094: 2090: 2086: 2080: 2077: 2072: 2068: 2064: 2044: 2041: 2038: 2035: 2030: 2024: 2020: 2017: 2014: 1992: 1986: 1981: 1974: 1969: 1963: 1956: 1953: 1949: 1945: 1940: 1932: 1929: 1919: 1915: 1911: 1903: 1896: 1891: 1885: 1880: 1877: 1868: 1854: 1848: 1845: 1840: 1835: 1825: 1822: 1817: 1814: 1809: 1806: 1803: 1799: 1776: 1773: 1769: 1765: 1758: 1754: 1750: 1745: 1741: 1736: 1715: 1712: 1704: 1701: 1697: 1687: 1671: 1668: 1660: 1657: 1637: 1634: 1619: 1616: 1611: 1608: 1603: 1597: 1594: 1591: 1583: 1580: 1570: 1562: 1559: 1556: 1548: 1545: 1540: 1531: 1528: 1520: 1514: 1511: 1508: 1505: 1480: 1477: 1460: 1451: 1437: 1432: 1427: 1402: 1399: 1393: 1387: 1379: 1357: 1351: 1340: 1332: 1328: 1318: 1314: 1302: 1296: 1291: 1280: 1272: 1268: 1258: 1254: 1242: 1236: 1231: 1220: 1214: 1206: 1203: 1199: 1165: 1159: 1156: 1150: 1144: 1141: 1135: 1129: 1126: 1120: 1114: 1100: 1097: 1091: 1088: 1085: 1079: 1071: 1061: 1042: 1038: 1005: 1002: 998: 990: 986: 974: 971: 968: 962: 957: 954: 945: 932: 931: 930: 913: 909: 901: 897: 887: 883: 871: 868: 865: 859: 854: 843: 834: 831: 828: 821: 818: 815: 809: 801: 797: 787: 783: 771: 768: 765: 759: 754: 741: 737: 733: 727: 719: 716: 712: 704: 703: 702: 700: 681: 678: 675: 669: 664: 661: 658: 655: 649: 646: 643: 637: 630:Substituting 628: 626: 622: 618: 614: 610: 606: 590: 582: 578: 577:Gibbs measure 573: 571: 567: 563: 547: 539: 535: 516: 513: 510: 503: 500: 497: 491: 483: 479: 469: 465: 453: 450: 447: 441: 438: 435: 430: 417: 413: 409: 406: 400: 392: 389: 385: 377: 376: 375: 372: 358: 355: 352: 349: 342: 339: 336: 330: 325: 321: 300: 280: 272: 269: 265: 249: 229: 206: 203: 200: 194: 187:, one writes 169: 165: 161: 158: 155: 150: 146: 142: 137: 133: 126: 123: 109: 107: 103: 98: 96: 92: 88: 84: 80: 76: 72: 68: 63: 61: 57: 52: 50: 46: 42: 38: 34: 30: 26: 22: 9414: 9407: 9400: 9347: 9343: 9331: 9295: 9291: 9278: 9235: 9231: 9187: 9131: 9127: 9081: 9077: 9071: 9052: 9046: 9011: 9007: 9001: 8982: 8972: 8917: 8913: 8903: 8671: 8629:. Then, if 8586: 8582: 8576: 8551: 8547: 8545: 8532: 8508: 8396: 8192: 8187: 8183: 8155: 8131: 8127: 8123: 8118: 7982: 7932: 7930: 7927: 7893: 7348:, it is the 7343: 7015: 6720: 6606: 6500: 6445: 6281: 6243: 6166: 5948: 5845: 5841:mixed states 5829:Bures metric 5818: 5769: 5746: 5661: 5234: 4828: 4544: 4450: 4442: 4375: 4371: 4369: 4346: 4215: 4047: 3908: 3905: 3863: 3855: 3697:curve length 3692: 3690: 3526: 3502: 3449: 3445: 3442:free entropy 3437: 3435: 3300:is given by 3291: 3271: 3159: 2944:of the form 2785: 2733: 2531: 2529: 2254:has formula 2199: 2144: 1869: 1688: 1457: 1072:, which has 1067: 1020: 928: 629: 620: 616: 612: 574: 569: 565: 537: 533: 531: 373: 270: 263: 115: 99: 95:Bures metric 91:mixed states 66: 64: 53: 36: 24: 18: 9313:2241/100265 8785:(after the 8579:submanifold 7350:Berry phase 5837:pure states 4088:. Writing 9425:Categories 9325:References 9021:1701.08895 8927:2302.08175 8920:(4): 654. 7939:, and let 4133:, so that 4048:where the 3699:, one has 1021:and apply 112:Definition 9357:0807.0621 9245:1009.5219 9141:0706.0559 9108:118311636 9091:0809.1166 8852:μ 8820:∈ 8797:μ 8761:∈ 8735:σ 8729:⁡ 8695:μ 8687:∈ 8684:σ 8657:θ 8637:θ 8617:θ 8597:μ 8519:μ 8490:μ 8482:∈ 8473:σ 8460:σ 8433:σ 8406:σ 8382:μ 8373:μ 8359:σ 8346:μ 8332:σ 8316:∫ 8300:σ 8287:σ 8244:μ 8204:∈ 8201:μ 8166:Σ 8142:μ 8104:μ 8078:Σ 8039:Ω 7996:Ω 7962:μ 7956:Σ 7902:α 7861:θ 7857:∂ 7849:⁡ 7843:∂ 7828:θ 7824:∂ 7819:α 7816:∂ 7810:− 7798:θ 7794:∂ 7789:α 7786:∂ 7771:θ 7767:∂ 7759:⁡ 7753:∂ 7702:θ 7698:∂ 7693:α 7690:∂ 7662:θ 7658:∂ 7653:α 7650:∂ 7635:− 7618:θ 7614:∂ 7609:α 7606:∂ 7591:θ 7587:∂ 7582:α 7579:∂ 7536:θ 7532:∂ 7524:⁡ 7518:∂ 7503:θ 7499:∂ 7491:⁡ 7485:∂ 7434:θ 7430:∂ 7426:∂ 7409:θ 7405:∂ 7401:∂ 7320:α 7314:∧ 7308:⁡ 7250:α 7228:− 7210:α 7170:⁡ 7101:→ 7065:→ 7062:δ 7027:α 7024:δ 6980:⁡ 6974:δ 6971:α 6968:δ 6965:− 6962:α 6959:δ 6953:⁡ 6947:δ 6935:∫ 6887:α 6884:δ 6875:∫ 6865:− 6841:α 6838:δ 6826:∫ 6785:⁡ 6779:δ 6767:∫ 6706:ψ 6698:α 6695:δ 6672:δ 6658:ψ 6655:δ 6624:⟩ 6621:ψ 6618:δ 6579:θ 6567:ψ 6561:θ 6547:∗ 6543:ϕ 6533:∫ 6526:⟩ 6523:ψ 6520:∣ 6517:ϕ 6514:⟨ 6484:θ 6472:ψ 6466:⟩ 6463:ψ 6460:∣ 6454:⟨ 6419:⟩ 6416:ψ 6413:∣ 6410:ψ 6407:⟨ 6401:⟩ 6398:ψ 6395:δ 6392:∣ 6389:ψ 6386:⟨ 6382:⟩ 6379:ψ 6376:∣ 6373:ψ 6370:δ 6367:⟨ 6361:− 6355:⟩ 6352:ψ 6349:∣ 6346:ψ 6343:⟨ 6338:⟩ 6335:ψ 6332:δ 6329:∣ 6326:ψ 6323:δ 6320:⟨ 6264:θ 6252:ψ 6203:θ 6191:ψ 6179:∫ 6136:θ 6115:∫ 6078:θ 6066:α 6043:θ 6031:α 6008:θ 5969:θ 5957:ψ 5929:θ 5917:α 5900:θ 5877:θ 5865:ψ 5755:θ 5720:δ 5700:θ 5696:∂ 5692:∂ 5677:θ 5629:θ 5625:∂ 5617:θ 5601:⁡ 5595:∂ 5579:θ 5575:∂ 5567:θ 5551:⁡ 5545:∂ 5510:θ 5506:∂ 5498:θ 5482:⁡ 5476:∂ 5460:θ 5456:∂ 5448:θ 5432:⁡ 5426:∂ 5416:θ 5394:∑ 5366:θ 5362:∂ 5358:∂ 5341:θ 5337:∂ 5333:∂ 5266:θ 5210:θ 5197:θ 5181:θ 5177:∂ 5169:θ 5153:⁡ 5147:∂ 5132:θ 5128:∂ 5120:θ 5104:⁡ 5098:∂ 5088:θ 5066:∑ 5053:∑ 5023:θ 5007:⁡ 4988:θ 4972:⁡ 4956:θ 4934:∑ 4883:θ 4837:θ 4797:⁡ 4771:⁡ 4742:∑ 4676:∑ 4611:∑ 4571:∑ 4508:∑ 4390:∑ 4323:δ 4298:∂ 4294:∂ 4273:∂ 4269:∂ 4191:δ 4167:∂ 4163:∂ 4103:∂ 4099:∂ 3989:∑ 3943:⋯ 3814:∫ 3785:∂ 3774:θ 3770:∂ 3745:∂ 3734:θ 3730:∂ 3711:∫ 3653:∫ 3630:∂ 3619:θ 3615:∂ 3590:∂ 3579:θ 3575:∂ 3558:∫ 3548:− 3478:− 3463:Δ 3409:∂ 3398:θ 3394:∂ 3385:θ 3360:∂ 3349:θ 3345:∂ 3328:∫ 3246:θ 3222:θ 3208:θ 3135:θ 3131:Δ 3108:θ 3082:θ 3078:Δ 3069:θ 3065:Δ 3053:∑ 3030:θ 3021:‖ 3009:θ 2975:θ 2961:θ 2926:θ 2919:θ 2890:θ 2874:θ 2842:θ 2833:‖ 2821:θ 2772:θ 2746:θ 2742:Δ 2711:θ 2693:θ 2689:∂ 2681:∂ 2665:θ 2661:Δ 2652:∑ 2636:θ 2620:θ 2582:θ 2552:θ 2499:ϕ 2493:⁡ 2487:⁡ 2430:μ 2426:− 2417:μ 2407:σ 2382:ϕ 2379:⁡ 2360:σ 2353:ϕ 2350:⁡ 2332:μ 2328:− 2319:μ 2297:μ 2284:μ 2265:↦ 2262:ϕ 2234:μ 2229:δ 2214:μ 2209:δ 2173:μ 2153:σ 2045:σ 2021:μ 1954:− 1950:σ 1930:− 1849:⁡ 1832:∇ 1818:− 1755:μ 1742:μ 1708:Σ 1702:μ 1669:− 1665:Σ 1629:Σ 1620:⁡ 1598:μ 1595:− 1581:− 1577:Σ 1563:μ 1560:− 1535:Σ 1529:μ 1512:⁡ 1506:− 1484:Σ 1478:μ 1428:θ 1424:∇ 1403:θ 1394:θ 1388:η 1341:⋅ 1329:θ 1325:∂ 1315:θ 1311:∂ 1303:θ 1297:η 1288:∂ 1281:− 1269:θ 1265:∂ 1255:θ 1251:∂ 1243:θ 1228:∂ 1215:θ 1151:θ 1142:− 1127:⋅ 1121:θ 1115:η 1092:θ 1089:∣ 1039:θ 1035:∂ 1031:∂ 987:θ 983:∂ 975:θ 972:∣ 958:⁡ 952:∂ 898:θ 894:∂ 884:θ 880:∂ 872:θ 869:∣ 851:∂ 822:θ 819:∣ 798:θ 794:∂ 784:θ 780:∂ 772:θ 769:∣ 751:∂ 738:∫ 728:θ 682:θ 679:∣ 665:⁡ 659:− 650:θ 647:∣ 591:θ 548:θ 504:θ 501:∣ 480:θ 476:∂ 466:θ 462:∂ 454:θ 451:∣ 439:⁡ 427:∂ 414:∫ 410:− 401:θ 343:θ 340:∣ 322:∫ 301:θ 230:θ 207:θ 204:∣ 166:θ 159:… 147:θ 134:θ 124:θ 9382:19257090 9270:55558124 9158:17930381 8964:37190442 8955:10137715 8868:See also 7016:Setting 3513:geodesic 3505:chemical 3448:to time 1064:Examples 293:but not 242:. Here 9399:(1985) 9390:8210246 9362:Bibcode 9250:Bibcode 9214:3469115 9166:7527491 9038:5954036 8932:Bibcode 8914:Entropy 8057:, with 7979:measure 6640:in the 6101:simplex 4082:1-forms 3874:orthant 2784:in the 2197:-axis. 2057:, then 583:, then 75:Hessian 9388:  9380:  9268:  9212:  9202:  9164:  9156:  9106:  9059:  9036:  8989:  8962:  8952:  8397:Here, 7935:be an 7048:2-form 6638:1-form 5949:Here, 5854:, so: 5793:Gromov 3864:For a 3294:action 2399:where 2007:. Let 1172:  1112:  69:, the 23:, the 9386:S2CID 9352:arXiv 9288:(PDF) 9266:S2CID 9240:arXiv 9162:S2CID 9136:arXiv 9104:S2CID 9086:arXiv 9034:S2CID 9016:arXiv 8922:arXiv 8895:Notes 8130:) of 8027:be a 7977:be a 6290:, is 6244:When 2734:with 697:from 9378:PMID 9200:ISBN 9154:PMID 9057:ISBN 8987:ISBN 8960:PMID 8424:and 8119:The 7931:Let 7080:and 6282:The 6023:and 4080:are 3693:dJSD 3507:and 3292:The 3276:and 3272:The 2567:and 1650:Let 568:and 67:i.e. 39:, a 37:i.e. 9370:doi 9308:hdl 9300:doi 9258:doi 9236:374 9192:doi 9146:doi 9096:doi 9026:doi 8950:PMC 8940:doi 8726:exp 8581:of 8154:on 8031:on 7981:on 7846:log 7756:log 7521:log 7488:log 7352:or 7305:log 7167:log 6977:log 6950:log 6782:log 5598:log 5548:log 5479:log 5429:log 5150:log 5101:log 5004:log 4969:log 4794:log 4768:log 4370:An 2534:or 2490:tan 2370:sin 2347:cos 1852:det 1623:det 1101:exp 955:log 662:log 536:in 436:log 313:: 19:In 9427:: 9384:. 9376:. 9368:. 9360:. 9348:79 9346:. 9306:. 9296:26 9294:. 9290:. 9264:. 9256:. 9248:. 9234:. 9222:^ 9210:MR 9208:. 9198:. 9186:. 9174:^ 9160:. 9152:. 9144:. 9132:99 9130:. 9116:^ 9102:. 9094:. 9082:42 9080:. 9032:. 9024:. 9010:. 8981:. 8958:. 8948:. 8938:. 8930:. 8918:25 8916:. 8912:. 8669:. 8543:. 8116:. 5988:; 4448:. 4367:. 3911:+1 2981::= 2522:. 2484:ln 2142:. 1867:. 1846:ln 1617:ln 1509:ln 1450:. 371:. 108:. 97:. 62:. 35:, 9392:. 9372:: 9364:: 9354:: 9316:. 9310:: 9302:: 9272:. 9260:: 9252:: 9242:: 9216:. 9194:: 9168:. 9148:: 9138:: 9110:. 9098:: 9088:: 9065:. 9040:. 9028:: 9018:: 9012:1 8995:. 8966:. 8942:: 8934:: 8924:: 8832:) 8829:X 8826:( 8823:S 8817:p 8773:) 8770:X 8767:( 8764:S 8758:p 8738:) 8732:( 8723:= 8720:p 8700:S 8691:T 8587:X 8585:( 8583:S 8552:X 8550:( 8548:S 8533:X 8509:d 8495:S 8486:T 8477:2 8469:, 8464:1 8437:2 8410:1 8379:d 8370:d 8363:2 8355:d 8343:d 8336:1 8328:d 8320:X 8312:= 8309:) 8304:2 8296:, 8291:1 8283:( 8280:g 8249:S 8240:T 8216:) 8213:X 8210:( 8207:S 8188:X 8186:( 8184:S 8156:X 8132:X 8128:X 8126:( 8124:S 8101:= 8098:P 8075:= 8070:F 8045:X 8042:= 8015:) 8012:P 8009:, 8004:F 7999:, 7993:( 7983:X 7965:) 7959:, 7953:, 7950:X 7947:( 7933:X 7908:0 7905:= 7874:] 7865:k 7852:p 7832:j 7802:k 7775:j 7762:p 7746:[ 7741:E 7735:2 7732:i 7727:+ 7714:] 7706:k 7684:[ 7679:E 7674:] 7666:j 7644:[ 7639:E 7631:] 7622:k 7595:j 7572:[ 7567:E 7563:+ 7549:] 7540:k 7527:p 7507:j 7494:p 7478:[ 7473:E 7467:4 7464:1 7455:= 7447:) 7438:k 7421:, 7413:j 7395:( 7391:h 7384:= 7379:k 7376:j 7372:h 7324:] 7317:d 7311:p 7302:d 7298:[ 7293:E 7287:2 7284:i 7279:+ 7264:2 7259:) 7254:] 7247:d 7243:[ 7238:E 7233:( 7224:] 7218:2 7214:) 7207:d 7204:( 7200:[ 7195:E 7191:+ 7187:] 7181:2 7177:) 7173:p 7164:d 7161:( 7157:[ 7152:E 7146:4 7143:1 7134:= 7131:h 7104:h 7096:2 7092:s 7088:d 7068:d 7033:0 7030:= 6997:x 6994:d 6990:p 6986:) 6983:p 6956:p 6944:( 6939:X 6929:2 6926:i 6921:+ 6907:2 6902:) 6898:x 6895:d 6891:p 6879:X 6870:( 6862:x 6859:d 6855:p 6849:2 6845:) 6835:( 6830:X 6822:+ 6809:x 6806:d 6802:p 6796:2 6792:) 6788:p 6776:( 6771:X 6761:4 6758:1 6749:= 6744:2 6740:s 6736:d 6702:) 6692:i 6689:+ 6683:p 6680:2 6675:p 6665:( 6661:= 6615:| 6592:. 6589:x 6586:d 6582:) 6576:; 6573:x 6570:( 6564:) 6558:; 6555:x 6552:( 6537:X 6529:= 6501:X 6487:) 6481:; 6478:x 6475:( 6469:= 6457:x 6431:. 6424:2 6314:= 6309:2 6305:s 6301:d 6267:) 6261:; 6258:x 6255:( 6229:1 6226:= 6223:x 6220:d 6214:2 6210:| 6206:) 6200:; 6197:x 6194:( 6188:| 6183:X 6152:1 6149:= 6146:x 6143:d 6139:) 6133:; 6130:x 6127:( 6124:p 6119:X 6087:0 6084:= 6081:) 6075:; 6072:x 6069:( 6046:) 6040:; 6037:x 6034:( 6011:) 6005:; 6002:x 5999:( 5996:p 5972:) 5966:; 5963:x 5960:( 5932:) 5926:; 5923:x 5920:( 5914:i 5910:e 5903:) 5897:; 5894:x 5891:( 5888:p 5883:= 5880:) 5874:; 5871:x 5868:( 5778:p 5732:. 5727:k 5724:j 5716:= 5712:) 5704:k 5687:( 5681:j 5673:d 5642:] 5633:k 5620:) 5614:( 5609:i 5605:p 5583:j 5570:) 5564:( 5559:i 5555:p 5538:[ 5533:E 5529:= 5514:k 5501:) 5495:( 5490:i 5486:p 5464:j 5451:) 5445:( 5440:i 5436:p 5419:) 5413:( 5408:i 5404:p 5398:i 5390:= 5379:) 5370:k 5353:, 5345:j 5327:( 5323:h 5320:4 5317:= 5307:r 5304:e 5301:h 5298:s 5295:i 5292:f 5286:k 5283:j 5279:h 5275:4 5272:= 5269:) 5263:( 5258:k 5255:j 5251:g 5214:k 5206:d 5201:j 5193:d 5185:k 5172:) 5166:( 5161:i 5157:p 5136:j 5123:) 5117:( 5112:i 5108:p 5091:) 5085:( 5080:i 5076:p 5070:i 5060:k 5057:j 5047:4 5044:1 5039:= 5029:) 5026:) 5020:( 5015:i 5011:p 5001:( 4998:d 4994:) 4991:) 4985:( 4980:i 4976:p 4966:( 4963:d 4959:) 4953:( 4948:i 4944:p 4938:i 4928:4 4925:1 4920:= 4913:h 4886:) 4880:( 4875:i 4871:p 4867:= 4862:i 4858:p 4810:) 4805:i 4801:p 4791:( 4788:d 4784:) 4779:i 4775:p 4765:( 4762:d 4756:i 4752:p 4746:i 4736:4 4733:1 4728:= 4721:i 4717:p 4710:i 4706:p 4702:d 4696:i 4692:p 4688:d 4680:i 4670:4 4667:1 4662:= 4648:i 4644:p 4638:d 4630:i 4626:p 4620:d 4615:i 4607:= 4602:i 4598:y 4594:d 4588:i 4584:y 4580:d 4575:i 4567:= 4560:h 4530:1 4527:= 4522:i 4518:p 4512:i 4482:2 4477:i 4473:y 4469:= 4464:i 4460:p 4428:1 4425:= 4420:2 4415:i 4411:y 4405:N 4400:0 4397:= 4394:i 4376:N 4372:N 4355:y 4330:k 4327:j 4319:= 4315:) 4306:k 4302:y 4289:, 4281:j 4277:y 4263:( 4259:h 4256:= 4250:t 4247:a 4244:l 4241:f 4235:k 4232:j 4228:h 4212:, 4198:k 4195:j 4187:= 4183:) 4175:k 4171:y 4158:( 4152:j 4148:y 4144:d 4111:j 4107:y 4065:i 4061:y 4057:d 4031:i 4027:y 4023:d 4017:i 4013:y 4009:d 4004:N 3999:0 3996:= 3993:i 3985:= 3982:h 3959:) 3954:n 3950:y 3946:, 3940:, 3935:0 3931:y 3927:( 3924:= 3921:y 3909:N 3889:2 3885:R 3839:D 3836:S 3833:J 3830:d 3823:b 3818:a 3808:8 3803:= 3800:t 3797:d 3788:t 3778:k 3762:k 3759:j 3755:g 3748:t 3738:j 3720:b 3715:a 3676:D 3673:S 3670:J 3667:d 3662:b 3657:a 3649:8 3646:= 3643:t 3640:d 3633:t 3623:k 3607:k 3604:j 3600:g 3593:t 3583:j 3567:b 3562:a 3554:) 3551:a 3545:b 3542:( 3487:A 3484:) 3481:a 3475:b 3472:( 3469:= 3466:S 3450:b 3446:a 3438:t 3421:t 3418:d 3412:t 3402:k 3388:) 3382:( 3377:k 3374:j 3370:g 3363:t 3353:j 3337:b 3332:a 3322:2 3319:1 3314:= 3311:A 3250:0 3225:) 3219:( 3212:0 3203:f 3176:k 3173:j 3169:g 3156:. 3144:) 3139:3 3128:( 3124:O 3120:+ 3117:) 3112:0 3104:( 3099:k 3096:j 3092:g 3086:k 3073:j 3060:k 3057:j 3047:2 3044:1 3039:= 3036:] 3033:) 3027:( 3024:P 3018:) 3013:0 3005:( 3002:P 2999:[ 2993:L 2990:K 2985:D 2978:) 2972:( 2965:0 2956:f 2930:0 2922:= 2899:) 2894:0 2886:( 2883:P 2880:= 2877:) 2871:( 2868:P 2848:] 2845:) 2839:( 2836:P 2830:) 2825:0 2817:( 2814:P 2811:[ 2805:L 2802:K 2797:D 2786:j 2750:j 2715:0 2705:| 2697:j 2684:P 2669:j 2656:j 2648:+ 2645:) 2640:0 2632:( 2629:P 2626:= 2623:) 2617:( 2614:P 2591:) 2586:0 2578:( 2575:P 2555:) 2549:( 2546:P 2510:) 2507:2 2503:/ 2496:( 2479:2 2474:= 2471:s 2446:2 2441:2 2434:0 2421:1 2410:= 2386:) 2374:2 2364:2 2356:, 2342:2 2336:0 2323:1 2312:+ 2307:2 2301:1 2293:+ 2288:0 2276:( 2270:N 2238:1 2225:, 2218:0 2183:2 2177:/ 2122:2 2118:y 2111:2 2107:y 2103:d 2100:+ 2095:2 2091:x 2087:d 2081:2 2078:= 2073:2 2069:s 2065:d 2042:= 2039:y 2036:, 2031:2 2025:/ 2018:= 2015:x 1993:] 1987:2 1982:0 1975:0 1970:1 1964:[ 1957:2 1946:= 1941:] 1933:1 1926:) 1920:2 1916:t 1912:2 1909:( 1904:0 1897:0 1892:t 1886:[ 1881:= 1878:g 1855:T 1841:2 1836:T 1826:2 1823:1 1815:= 1810:T 1807:, 1804:T 1800:g 1777:j 1774:i 1770:T 1766:= 1759:j 1751:, 1746:i 1737:g 1716:0 1713:= 1705:, 1698:g 1672:1 1661:= 1658:T 1638:C 1635:+ 1632:) 1626:( 1612:2 1609:1 1604:+ 1601:) 1592:x 1589:( 1584:1 1571:T 1567:) 1557:x 1554:( 1549:2 1546:1 1541:= 1538:) 1532:, 1525:| 1521:x 1518:( 1515:p 1487:) 1481:, 1475:( 1470:N 1438:A 1433:2 1400:= 1397:) 1391:( 1364:] 1361:) 1358:x 1355:( 1352:T 1349:[ 1345:E 1333:k 1319:j 1306:) 1300:( 1292:2 1273:k 1259:j 1246:) 1240:( 1237:A 1232:2 1221:= 1218:) 1212:( 1207:k 1204:j 1200:g 1177:] 1169:) 1166:x 1163:( 1160:B 1157:+ 1154:) 1148:( 1145:A 1139:) 1136:x 1133:( 1130:T 1124:) 1118:( 1107:[ 1098:= 1095:) 1086:x 1083:( 1080:p 1043:k 1006:0 1003:= 999:] 991:j 978:) 969:x 966:( 963:p 946:[ 941:E 914:. 910:] 902:k 888:j 875:) 866:x 863:( 860:i 855:2 844:[ 839:E 835:= 832:x 829:d 825:) 816:x 813:( 810:p 802:k 788:j 775:) 766:x 763:( 760:i 755:2 742:R 734:= 731:) 725:( 720:k 717:j 713:g 685:) 676:x 673:( 670:p 656:= 653:) 644:x 641:( 638:i 621:n 617:n 613:n 570:k 566:j 538:R 534:x 517:. 514:x 511:d 507:) 498:x 495:( 492:p 484:k 470:j 457:) 448:x 445:( 442:p 431:2 418:R 407:= 404:) 398:( 393:k 390:j 386:g 359:1 356:= 353:x 350:d 346:) 337:x 334:( 331:p 326:R 281:x 271:X 264:R 250:x 210:) 201:x 198:( 195:p 175:) 170:n 162:, 156:, 151:2 143:, 138:1 130:( 127:=

Index

information geometry
Riemannian metric
statistical manifold
smooth manifold
probability measures
probability space
Chentsov’s theorem
sufficient statistics
Kullback–Leibler divergence
Hessian
Euclidean metric
projective Hilbert space
Fubini–Study metric
mixed states
Bures metric
Fisher information matrix
observed information
random variable
Riemann manifold
Gibbs measure
Markovian process
Lagrange multiplier
expectation value
partition function
information theory
exponential family
natural parameters
Multivariate normal distribution
Poincaré half-plane model
Kullback–Leibler divergence

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