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Measurable function

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or the preimage of any open set being measurable. Continuous functions, monotone functions, step functions, semicontinuous functions, Riemann-integrable functions, and functions of bounded variation are all Lebesgue measurable. A function
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Real-valued functions encountered in applications tend to be measurable; however, it is not difficult to prove the existence of non-measurable functions. Such proofs rely on the
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is non-metrizable. The corresponding statement for continuous functions requires stronger conditions than pointwise convergence, such as uniform convergence.
3618: 976:. Continuous functions are Borel functions but not all Borel functions are continuous. However, a measurable function is nearly a continuous function; see 4186: 3696: 614: 4203: 3713: 422: 1520:
The sum and product of two complex-valued measurable functions are measurable. So is the quotient, so long as there is no division by zero.
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Indeed, two Lebesgue-measurable functions may be constructed in such a way as to make their composition non-Lebesgue-measurable.
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of a sequence (viz., countably many) of real-valued measurable functions are all measurable as well.
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Random variables are by definition measurable functions defined on probability spaces.
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is a metric space (endowed with the Borel algebra). This is not true in general if
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since the preimage of any point in the range is some proper, nonempty subset of
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without the axiom of choice does not prove the existence of such functions.
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is measurable if and only if the real and imaginary parts are measurable.
817:(generated by all the open sets) is a common choice. Some authors define 33: 4263: 3954: 3051: 56:
set is measurable. This is in direct analogy to the definition that a
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as exclusively real-valued ones with respect to the Borel algebra.
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Function for which the preimage of a measurable set is measurable
665:{\displaystyle f\colon (X,\Sigma )\rightarrow (Y,\mathrm {T} ).} 499:{\displaystyle f^{-1}(E):=\{x\in X\mid f(x)\in E\}\in \Sigma .} 828:, other non-equivalent definitions of measurability, such as 3764: 1735:{\displaystyle g\circ f:(X,\Sigma _{1})\to (Z,\Sigma _{3}).} 2354: 1346:{\displaystyle \{f>\alpha \}=\{x\in X:f(x)>\alpha \}} 839: 75:, measurable functions are used in the definition of the 980:. If a Borel function happens to be a section of a map 2739:
Real Analysis: Modern Techniques and their Applications
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are measurable functions, then so is their composition
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Infinite Dimensional Analysis, A Hitchhiker's Guide
2812:Aliprantis, Charalambos D.; Border, Kim C. (2006). 3973: 2709: 2680: 2629: 2579: 2556: 2533: 2492: 2472: 2435: 2412: 2382: 2360: 2222: 2194: 2161: 2108: 2088: 2068: 2003: 1960: 1914: 1876: 1806: 1734: 1655: 1585: 1502: 1467: 1444: 1376: 1345: 1274: 1255: 1214: 1182: 1149: 1129: 1105: 1014: 964: 904: 872: 805: 781: 756: 729: 704: 684: 664: 603: 567: 538: 498: 412: 384: 364: 344: 324: 296: 264: 239: 218: 197: 177: 157: 123: 2004:{\displaystyle \Sigma _{3}\subseteq \Sigma _{2}.} 1222:Lebesgue measurable functions are of interest in 44:is a function between the underlying sets of two 4283: 2811: 48:that preserves the structure of the spaces: the 67:the topological structure: the preimage of any 2480:is non-measurable with respect to the trivial 2446:As another example, any non-constant function 3780: 2874: 1183:{\displaystyle {\mathcal {B}}_{\mathbb {C} }} 3619:Riesz–Markov–Kakutani representation theorem 2674: 2672: 2670: 2668: 2525: 2513: 2407: 2401: 2037:limit of a sequence of measurable functions 1884:are measurable functions, their composition 1439: 1427: 1421: 1409: 1403: 1391: 1340: 1307: 1301: 1289: 1226:because they can be integrated. In the case 539:{\displaystyle \sigma (f)\subseteq \Sigma ,} 484: 451: 2534:{\displaystyle \Sigma =\{\varnothing ,X\},} 2120: 4204:Vitale's random Brunn–Minkowski inequality 3787: 3773: 3714:Vitale's random Brunn–Minkowski inequality 2881: 2867: 2791:(2 ed.). Cambridge University Press. 2678: 2644: â€“ Subject of study in ergodic theory 1157:-algebra of Lebesgue measurable sets, and 2805: 2707: 2665: 2466: 2376: 2275: 1961:{\displaystyle (\Sigma _{1},\Sigma _{4})} 1496: 1367: 1246: 1205: 1174: 1091: 1074: 1050: 1015:{\displaystyle Y\xrightarrow {~\pi ~} X,} 796: 772: 2701: 1377:{\displaystyle \alpha \in \mathbb {R} .} 824:If the values of the function lie in an 739: 2736: 2564:which is not an element of the trivial 2129:in an essential way, in the sense that 840:Notable classes of measurable functions 14: 4284: 2786: 2761: 2730: 1282:is Lebesgue measurable if and only if 965:{\displaystyle f:(X,\Sigma )\to (Y,T)} 304:is said to be measurable if for every 3768: 2862: 2780: 2755: 611:is a measurable function, one writes 4217:Applications & related 3727:Applications & related 1256:{\displaystyle f:X\to \mathbb {R} ,} 94: 4136:Marcinkiewicz interpolation theorem 2642:Measure-preserving dynamical system 2473:{\displaystyle f:X\to \mathbb {R} } 2230:one can construct a non-measurable 1503:{\displaystyle f:X\to \mathbb {C} } 672:to emphasize the dependency on the 165:be measurable spaces, meaning that 24: 4062:Symmetric decreasing rearrangement 3966: 2888: 2571: 2507: 2265: 2214: 2153: 1989: 1976: 1946: 1933: 1862: 1837: 1792: 1767: 1717: 1692: 1641: 1616: 1571: 1546: 1515:Properties of measurable functions 1384:This is also equivalent to any of 1167: 1122: 1084: 1059: 1033:function is a measurable function 938: 864: 720: 699: 652: 633: 530: 490: 406: 379: 318: 255: 234: 205:are sets equipped with respective 148: 115: 25: 4308: 2834: 2603: â€“ Type of topological space 2516: 826:infinite-dimensional vector space 813:or other topological spaces, the 413:{\displaystyle E\in \mathrm {T} } 325:{\displaystyle E\in \mathrm {T} } 3656:Lebesgue differentiation theorem 3537:CarathĂ©odory's extension theorem 2285: 2243: 2223:{\displaystyle A\notin \Sigma ,} 158:{\displaystyle (Y,\mathrm {T} )} 2282: 1915:{\displaystyle g\circ f:X\to Z} 2716:. Cambridge University Press. 2462: 2301: 2295: 2271: 2268: 2256: 2156: 2144: 2060: 1955: 1929: 1906: 1871: 1852: 1849: 1846: 1827: 1801: 1782: 1779: 1776: 1757: 1726: 1707: 1704: 1701: 1682: 1650: 1631: 1628: 1625: 1606: 1580: 1561: 1558: 1555: 1536: 1492: 1331: 1325: 1242: 1130:{\displaystyle {\mathcal {L}}} 1097: 1070: 1067: 1064: 1046: 959: 947: 944: 941: 929: 899: 887: 867: 855: 656: 642: 639: 636: 624: 595: 562: 556: 524: 518: 475: 469: 445: 439: 288: 152: 138: 118: 106: 13: 1: 4032:Convergence almost everywhere 3794: 2789:Real Analysis and Probability 1215:{\displaystyle \mathbb {C} .} 806:{\displaystyle \mathbb {C} ,} 782:{\displaystyle \mathbb {R} ,} 730:{\displaystyle \mathrm {T} .} 265:{\displaystyle \mathrm {T} .} 83:, a measurable function on a 2383:{\displaystyle \mathbb {R} } 2069:{\displaystyle f_{n}:X\to Y} 7: 4199:PrĂ©kopa–Leindler inequality 4052:Locally integrable function 3974:{\displaystyle L^{\infty }} 3709:PrĂ©kopa–Leindler inequality 2854:Encyclopedia of Mathematics 2845:Encyclopedia of Mathematics 2737:Folland, Gerald B. (1999). 2679:Strichartz, Robert (2000). 2596:Bochner measurable function 2589: 2390:is equipped with the usual 2195:{\displaystyle A\subset X,} 2162:{\displaystyle (X,\Sigma )} 2131:Zermelo–Fraenkel set theory 873:{\displaystyle (X,\Sigma )} 124:{\displaystyle (X,\Sigma )} 10: 4313: 3945:Square-integrable function 3651:Lebesgue's density theorem 2653:Weakly measurable function 568:{\displaystyle \sigma (f)} 4216: 4194:Minkowski–Steiner formula 4164: 4126: 4070: 4019: 3953: 3897: 3866: 3802: 3726: 3704:Minkowski–Steiner formula 3674: 3634: 3627: 3527: 3519:Projection-valued measure 3420: 3313: 3082: 2955: 2896: 2708:Carothers, N. L. (2000). 1452:being measurable for all 4177:Isoperimetric inequality 3687:Isoperimetric inequality 3666:Vitali–Hahn–Saks theorem 2995:CarathĂ©odory's criterion 2816:(3 ed.). Springer. 2658: 2580:{\displaystyle \Sigma .} 2121:Non-measurable functions 1468:{\displaystyle \alpha ,} 916:, a measurable function 604:{\displaystyle f:X\to Y} 577:σ-algebra generated by f 297:{\displaystyle f:X\to Y} 4182:Brunn–Minkowski theorem 3692:Brunn–Minkowski theorem 3561:Decomposition theorems 2493:{\displaystyle \sigma } 1150:{\displaystyle \sigma } 757:{\displaystyle \sigma } 705:{\displaystyle \Sigma } 685:{\displaystyle \sigma } 385:{\displaystyle \Sigma } 240:{\displaystyle \Sigma } 219:{\displaystyle \sigma } 4037:Convergence in measure 3975: 3739:Descriptive set theory 3639:Disintegration theorem 3074:Universally measurable 2787:Dudley, R. M. (2002). 2762:Royden, H. L. (1988). 2687:. Jones and Bartlett. 2631: 2581: 2558: 2535: 2494: 2474: 2437: 2420:is the non-measurable 2414: 2384: 2362: 2224: 2196: 2163: 2110: 2090: 2070: 2005: 1962: 1916: 1878: 1808: 1736: 1657: 1587: 1504: 1469: 1446: 1378: 1353:is measurable for all 1347: 1276: 1257: 1216: 1184: 1151: 1131: 1107: 1016: 966: 906: 874: 807: 783: 758: 731: 706: 686: 666: 605: 569: 540: 500: 414: 386: 366: 346: 326: 298: 266: 241: 220: 199: 179: 159: 125: 4151:Riesz–Fischer theorem 3976: 3935:Polarization identity 3541:Convergence theorems 3000:Cylindrical σ-algebra 2632: 2630:{\displaystyle L^{p}} 2582: 2559: 2536: 2495: 2475: 2438: 2415: 2413:{\displaystyle \{1\}} 2385: 2363: 2225: 2197: 2164: 2136:In any measure space 2111: 2091: 2076:is measurable, where 2071: 2006: 1963: 1917: 1879: 1809: 1737: 1658: 1588: 1505: 1470: 1447: 1379: 1348: 1277: 1258: 1224:mathematical analysis 1217: 1185: 1152: 1132: 1108: 1017: 967: 907: 905:{\displaystyle (Y,T)} 875: 834:Bochner measurability 808: 784: 759: 740:Term usage variations 732: 707: 687: 667: 606: 570: 541: 501: 415: 387: 367: 347: 327: 299: 267: 242: 221: 200: 180: 160: 126: 4156:Riesz–Thorin theorem 3999:Infimum and supremum 3958: 3884:Lebesgue integration 3609:Minkowski inequality 3483:Cylinder set measure 3368:Infinite-dimensional 2983:equivalence relation 2913:Lebesgue integration 2614: 2568: 2545: 2504: 2484: 2450: 2424: 2398: 2372: 2238: 2205: 2177: 2141: 2100: 2080: 2041: 1972: 1926: 1888: 1818: 1748: 1667: 1597: 1527: 1480: 1456: 1388: 1357: 1286: 1266: 1230: 1201: 1161: 1141: 1117: 1037: 984: 920: 884: 852: 819:measurable functions 792: 768: 748: 716: 696: 676: 615: 583: 550: 512: 423: 396: 376: 356: 336: 308: 276: 251: 231: 210: 189: 169: 135: 103: 36:, and in particular 4118:Young's convolution 4057:Measurable function 3940:Pythagorean theorem 3930:Parseval's identity 3879:Integrable function 3604:Hölder's inequality 3466:of random variables 3428:Measurable function 3315:Particular measures 2904:Absolute continuity 2841:Measurable function 2683:The Way of Analysis 1968:-measurable unless 1031:Lebesgue measurable 1004: 392:; that is, for all 42:measurable function 4297:Types of functions 4239:Probability theory 4141:Plancherel theorem 4047:Integral transform 3994:Chebyshev distance 3971: 3920:Euclidean distance 3853:Minkowski distance 3744:Probability theory 3069:Transverse measure 3047:Non-measurable set 3029:Locally measurable 2627: 2577: 2557:{\displaystyle X,} 2554: 2531: 2490: 2470: 2436:{\displaystyle A.} 2433: 2410: 2380: 2358: 2353: 2232:indicator function 2220: 2192: 2172:non-measurable set 2159: 2106: 2086: 2066: 2001: 1958: 1912: 1874: 1804: 1732: 1653: 1583: 1500: 1465: 1442: 1374: 1343: 1272: 1253: 1212: 1180: 1147: 1127: 1103: 1012: 962: 902: 870: 830:weak measurability 803: 779: 754: 727: 702: 682: 662: 601: 565: 536: 496: 410: 382: 362: 342: 322: 294: 262: 237: 216: 195: 175: 155: 121: 81:probability theory 62:topological spaces 4279: 4278: 4212: 4211: 4027:Almost everywhere 3812: &  3762: 3761: 3722: 3721: 3451:almost everywhere 3397:Spherical measure 3295:Strictly positive 3223:Projection-valued 2963:Almost everywhere 2936:Probability space 2823:978-3-540-29587-7 2766:. Prentice Hall. 2346: 2323: 2109:{\displaystyle Y} 2089:{\displaystyle Y} 1275:{\displaystyle f} 1005: 1003: 997: 972:is also called a 365:{\displaystyle f} 345:{\displaystyle E} 332:the pre-image of 198:{\displaystyle Y} 178:{\displaystyle X} 95:Formal definition 85:probability space 77:Lebesgue integral 60:function between 46:measurable spaces 16:(Redirected from 4304: 4229:Fourier analysis 4187:Milman's reverse 4170: 4168:Lebesgue measure 4162: 4161: 4146:Riemann–Lebesgue 3989:Bounded function 3980: 3978: 3977: 3972: 3970: 3969: 3889:Taxicab geometry 3844:Measurable space 3789: 3782: 3775: 3766: 3765: 3697:Milman's reverse 3680: 3678:Lebesgue measure 3632: 3631: 3036: 3022:infimum/supremum 2943:Measurable space 2883: 2876: 2869: 2860: 2859: 2828: 2827: 2809: 2803: 2802: 2784: 2778: 2777: 2759: 2753: 2752: 2734: 2728: 2727: 2715: 2705: 2699: 2698: 2686: 2676: 2636: 2634: 2633: 2628: 2626: 2625: 2586: 2584: 2583: 2578: 2563: 2561: 2560: 2555: 2540: 2538: 2537: 2532: 2499: 2497: 2496: 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3858:Sequence spaces 3798: 3793: 3763: 3758: 3754:Spectral theory 3734:Convex analysis 3718: 3675: 3670: 3623: 3523: 3471:in distribution 3416: 3309: 3139:Logarithmically 3078: 3034: 3017:Essential range 2951: 2892: 2887: 2837: 2832: 2831: 2824: 2810: 2806: 2799: 2785: 2781: 2774: 2760: 2756: 2749: 2735: 2731: 2724: 2706: 2702: 2695: 2677: 2666: 2661: 2621: 2617: 2615: 2612: 2611: 2592: 2569: 2566: 2565: 2546: 2543: 2542: 2505: 2502: 2501: 2485: 2482: 2481: 2465: 2451: 2448: 2447: 2425: 2422: 2421: 2399: 2396: 2395: 2375: 2373: 2370: 2369: 2352: 2351: 2345: otherwise 2343: 2341: 2335: 2334: 2320: 2318: 2308: 2307: 2289: 2284: 2283: 2274: 2247: 2242: 2241: 2239: 2236: 2235: 2206: 2203: 2202: 2178: 2175: 2174: 2142: 2139: 2138: 2127:axiom of choice 2123: 2101: 2098: 2097: 2081: 2078: 2077: 2048: 2044: 2042: 2039: 2038: 1992: 1988: 1979: 1975: 1973: 1970: 1969: 1949: 1945: 1936: 1932: 1927: 1924: 1923: 1889: 1886: 1885: 1865: 1861: 1840: 1836: 1819: 1816: 1815: 1795: 1791: 1770: 1766: 1749: 1746: 1745: 1720: 1716: 1695: 1691: 1668: 1665: 1664: 1644: 1640: 1619: 1615: 1598: 1595: 1594: 1574: 1570: 1549: 1545: 1528: 1525: 1524: 1517: 1495: 1481: 1478: 1477: 1457: 1454: 1453: 1389: 1386: 1385: 1366: 1358: 1355: 1354: 1287: 1284: 1283: 1267: 1264: 1263: 1245: 1231: 1228: 1227: 1204: 1202: 1199: 1198: 1196:complex numbers 1173: 1172: 1166: 1165: 1164: 1162: 1159: 1158: 1142: 1139: 1138: 1121: 1120: 1118: 1115: 1114: 1090: 1089: 1083: 1082: 1081: 1073: 1058: 1057: 1049: 1038: 1035: 1034: 1022:it is called a 985: 982: 981: 978:Luzin's theorem 921: 918: 917: 885: 882: 881: 853: 850: 849: 842: 795: 793: 790: 789: 771: 769: 766: 765: 749: 746: 745: 742: 719: 717: 714: 713: 697: 694: 693: 677: 674: 673: 651: 616: 613: 612: 584: 581: 580: 551: 548: 547: 513: 510: 509: 430: 426: 424: 421: 420: 405: 397: 394: 393: 377: 374: 373: 357: 354: 353: 337: 334: 333: 317: 309: 306: 305: 277: 274: 273: 254: 252: 249: 248: 232: 229: 228: 211: 208: 207: 190: 187: 186: 170: 167: 166: 147: 136: 133: 132: 104: 101: 100: 97: 89:random variable 28: 23: 22: 15: 12: 11: 5: 4310: 4300: 4299: 4294: 4292:Measure theory 4277: 4276: 4274: 4273: 4272: 4271: 4266: 4256: 4251: 4246: 4241: 4236: 4231: 4226: 4220: 4218: 4214: 4213: 4210: 4209: 4207: 4206: 4201: 4196: 4191: 4190: 4189: 4179: 4173: 4171: 4159: 4158: 4153: 4148: 4143: 4138: 4132: 4130: 4124: 4123: 4121: 4120: 4115: 4110: 4105: 4100: 4095: 4090: 4085: 4080: 4074: 4072: 4068: 4067: 4065: 4064: 4059: 4054: 4049: 4044: 4042:Function space 4039: 4034: 4029: 4023: 4021: 4017: 4016: 4014: 4013: 4008: 4007: 4006: 3996: 3991: 3985: 3983: 3968: 3964: 3951: 3950: 3948: 3947: 3942: 3937: 3932: 3927: 3922: 3917: 3915:Cauchy–Schwarz 3912: 3906: 3904: 3895: 3894: 3892: 3891: 3886: 3881: 3875: 3873: 3864: 3863: 3861: 3860: 3855: 3850: 3841: 3836: 3835: 3834: 3824: 3816: 3814:Hilbert spaces 3806: 3804: 3803:Basic concepts 3800: 3799: 3792: 3791: 3784: 3777: 3769: 3760: 3759: 3757: 3756: 3751: 3746: 3741: 3736: 3730: 3728: 3724: 3723: 3720: 3719: 3717: 3716: 3711: 3706: 3701: 3700: 3699: 3689: 3683: 3681: 3672: 3671: 3669: 3668: 3663: 3661:Sard's theorem 3658: 3653: 3648: 3647: 3646: 3644:Lifting theory 3635: 3629: 3625: 3624: 3622: 3621: 3616: 3611: 3606: 3601: 3600: 3599: 3597:Fubini–Tonelli 3589: 3584: 3579: 3578: 3577: 3572: 3567: 3559: 3558: 3557: 3552: 3547: 3539: 3533: 3531: 3525: 3524: 3522: 3521: 3516: 3511: 3506: 3501: 3496: 3491: 3485: 3480: 3479: 3478: 3476:in probability 3473: 3463: 3458: 3453: 3447: 3446: 3445: 3440: 3435: 3424: 3422: 3418: 3417: 3415: 3414: 3409: 3404: 3399: 3394: 3389: 3388: 3387: 3377: 3372: 3371: 3370: 3360: 3355: 3350: 3345: 3340: 3335: 3330: 3325: 3319: 3317: 3311: 3310: 3308: 3307: 3302: 3297: 3292: 3287: 3282: 3277: 3272: 3267: 3262: 3257: 3256: 3255: 3250: 3245: 3235: 3230: 3225: 3220: 3210: 3205: 3200: 3195: 3190: 3185: 3183:Locally finite 3180: 3170: 3165: 3160: 3155: 3150: 3145: 3135: 3130: 3125: 3120: 3115: 3110: 3105: 3100: 3095: 3089: 3087: 3080: 3079: 3077: 3076: 3071: 3066: 3061: 3056: 3055: 3054: 3044: 3039: 3031: 3026: 3025: 3024: 3014: 3009: 3008: 3007: 2997: 2992: 2987: 2986: 2985: 2975: 2970: 2965: 2959: 2957: 2953: 2952: 2950: 2949: 2940: 2939: 2938: 2928: 2923: 2915: 2910: 2900: 2898: 2897:Basic concepts 2894: 2893: 2890:Measure theory 2886: 2885: 2878: 2871: 2863: 2857: 2856: 2850:Borel function 2847: 2836: 2835:External links 2833: 2830: 2829: 2822: 2804: 2797: 2779: 2772: 2754: 2747: 2729: 2722: 2700: 2693: 2663: 2662: 2660: 2657: 2656: 2655: 2650: 2648:Vector measure 2645: 2639: 2624: 2620: 2604: 2598: 2591: 2588: 2576: 2573: 2553: 2550: 2530: 2527: 2524: 2521: 2518: 2515: 2512: 2509: 2489: 2468: 2464: 2461: 2458: 2455: 2432: 2429: 2409: 2406: 2403: 2378: 2355: 2350: 2342: 2340: 2337: 2336: 2333: 2330: 2327: 2322: if  2319: 2317: 2314: 2313: 2311: 2306: 2303: 2300: 2297: 2292: 2287: 2281: 2277: 2273: 2270: 2267: 2264: 2261: 2258: 2255: 2250: 2245: 2219: 2216: 2213: 2210: 2191: 2188: 2185: 2182: 2158: 2155: 2152: 2149: 2146: 2122: 2119: 2118: 2117: 2105: 2085: 2065: 2062: 2059: 2056: 2051: 2047: 2031: 2028:limit inferior 2024:limit superior 2012: 2000: 1995: 1991: 1987: 1982: 1978: 1957: 1952: 1948: 1944: 1939: 1935: 1931: 1911: 1908: 1905: 1902: 1899: 1896: 1893: 1873: 1868: 1864: 1860: 1857: 1854: 1851: 1848: 1843: 1839: 1835: 1832: 1829: 1826: 1823: 1803: 1798: 1794: 1790: 1787: 1784: 1781: 1778: 1773: 1769: 1765: 1762: 1759: 1756: 1753: 1742: 1731: 1728: 1723: 1719: 1715: 1712: 1709: 1706: 1703: 1698: 1694: 1690: 1687: 1684: 1681: 1678: 1675: 1672: 1652: 1647: 1643: 1639: 1636: 1633: 1630: 1627: 1622: 1618: 1614: 1611: 1608: 1605: 1602: 1582: 1577: 1573: 1569: 1566: 1563: 1560: 1557: 1552: 1548: 1544: 1541: 1538: 1535: 1532: 1521: 1516: 1513: 1512: 1511: 1498: 1494: 1491: 1488: 1485: 1464: 1461: 1441: 1438: 1435: 1432: 1429: 1426: 1423: 1420: 1417: 1414: 1411: 1408: 1405: 1402: 1399: 1396: 1393: 1373: 1369: 1365: 1362: 1342: 1339: 1336: 1333: 1330: 1327: 1324: 1321: 1318: 1315: 1312: 1309: 1306: 1303: 1300: 1297: 1294: 1291: 1271: 1252: 1248: 1244: 1241: 1238: 1235: 1211: 1207: 1176: 1169: 1146: 1124: 1102: 1099: 1093: 1086: 1080: 1076: 1072: 1069: 1066: 1061: 1056: 1052: 1048: 1045: 1042: 1027: 1011: 1008: 1000: 993: 989: 974:Borel function 961: 958: 955: 952: 949: 946: 943: 940: 937: 934: 931: 928: 925: 901: 898: 895: 892: 889: 869: 866: 863: 860: 857: 846: 841: 838: 802: 798: 778: 774: 753: 744:The choice of 741: 738: 726: 722: 701: 681: 661: 658: 654: 650: 647: 644: 641: 638: 635: 632: 629: 626: 623: 620: 600: 597: 594: 591: 588: 564: 561: 558: 555: 535: 532: 529: 526: 523: 520: 517: 495: 492: 489: 486: 483: 480: 477: 474: 471: 468: 465: 462: 459: 456: 453: 450: 447: 444: 441: 436: 433: 429: 408: 404: 401: 381: 361: 341: 320: 316: 313: 293: 290: 287: 284: 281: 261: 257: 236: 215: 194: 174: 154: 150: 146: 143: 140: 120: 117: 114: 111: 108: 96: 93: 87:is known as a 38:measure theory 26: 18:Borel function 9: 6: 4: 3: 2: 4309: 4298: 4295: 4293: 4290: 4289: 4287: 4270: 4267: 4265: 4262: 4261: 4260: 4257: 4255: 4254:Sobolev space 4252: 4250: 4249:Real analysis 4247: 4245: 4242: 4240: 4237: 4235: 4234:Lorentz space 4232: 4230: 4227: 4225: 4224:Bochner space 4222: 4221: 4219: 4215: 4205: 4202: 4200: 4197: 4195: 4192: 4188: 4185: 4184: 4183: 4180: 4178: 4175: 4174: 4172: 4169: 4163: 4157: 4154: 4152: 4149: 4147: 4144: 4142: 4139: 4137: 4134: 4133: 4131: 4129: 4125: 4119: 4116: 4114: 4111: 4109: 4106: 4104: 4101: 4099: 4096: 4094: 4091: 4089: 4086: 4084: 4081: 4079: 4076: 4075: 4073: 4069: 4063: 4060: 4058: 4055: 4053: 4050: 4048: 4045: 4043: 4040: 4038: 4035: 4033: 4030: 4028: 4025: 4024: 4022: 4018: 4012: 4009: 4005: 4002: 4001: 4000: 3997: 3995: 3992: 3990: 3987: 3986: 3984: 3982: 3962: 3952: 3946: 3943: 3941: 3938: 3936: 3933: 3931: 3928: 3926: 3925:Hilbert space 3923: 3921: 3918: 3916: 3913: 3911: 3908: 3907: 3905: 3903: 3901: 3896: 3890: 3887: 3885: 3882: 3880: 3877: 3876: 3874: 3872: 3870: 3865: 3859: 3856: 3854: 3851: 3849: 3845: 3842: 3840: 3839:Measure space 3837: 3833: 3830: 3829: 3828: 3825: 3823: 3821: 3817: 3815: 3811: 3808: 3807: 3805: 3801: 3797: 3790: 3785: 3783: 3778: 3776: 3771: 3770: 3767: 3755: 3752: 3750: 3749:Real analysis 3747: 3745: 3742: 3740: 3737: 3735: 3732: 3731: 3729: 3725: 3715: 3712: 3710: 3707: 3705: 3702: 3698: 3695: 3694: 3693: 3690: 3688: 3685: 3684: 3682: 3679: 3673: 3667: 3664: 3662: 3659: 3657: 3654: 3652: 3649: 3645: 3642: 3641: 3640: 3637: 3636: 3633: 3630: 3628:Other results 3626: 3620: 3617: 3615: 3614:Radon–Nikodym 3612: 3610: 3607: 3605: 3602: 3598: 3595: 3594: 3593: 3590: 3588: 3587:Fatou's lemma 3585: 3583: 3580: 3576: 3573: 3571: 3568: 3566: 3563: 3562: 3560: 3556: 3553: 3551: 3548: 3546: 3543: 3542: 3540: 3538: 3535: 3534: 3532: 3530: 3526: 3520: 3517: 3515: 3512: 3510: 3507: 3505: 3502: 3500: 3497: 3495: 3492: 3490: 3486: 3484: 3481: 3477: 3474: 3472: 3469: 3468: 3467: 3464: 3462: 3459: 3457: 3454: 3452: 3449:Convergence: 3448: 3444: 3441: 3439: 3436: 3434: 3431: 3430: 3429: 3426: 3425: 3423: 3419: 3413: 3410: 3408: 3405: 3403: 3400: 3398: 3395: 3393: 3390: 3386: 3383: 3382: 3381: 3378: 3376: 3373: 3369: 3366: 3365: 3364: 3361: 3359: 3356: 3354: 3351: 3349: 3346: 3344: 3341: 3339: 3336: 3334: 3331: 3329: 3326: 3324: 3321: 3320: 3318: 3316: 3312: 3306: 3303: 3301: 3298: 3296: 3293: 3291: 3288: 3286: 3283: 3281: 3278: 3276: 3273: 3271: 3268: 3266: 3263: 3261: 3258: 3254: 3253:Outer regular 3251: 3249: 3248:Inner regular 3246: 3244: 3243:Borel regular 3241: 3240: 3239: 3236: 3234: 3231: 3229: 3226: 3224: 3221: 3219: 3215: 3211: 3209: 3206: 3204: 3201: 3199: 3196: 3194: 3191: 3189: 3186: 3184: 3181: 3179: 3175: 3171: 3169: 3166: 3164: 3161: 3159: 3156: 3154: 3151: 3149: 3146: 3144: 3140: 3136: 3134: 3131: 3129: 3126: 3124: 3121: 3119: 3116: 3114: 3111: 3109: 3106: 3104: 3101: 3099: 3096: 3094: 3091: 3090: 3088: 3086: 3081: 3075: 3072: 3070: 3067: 3065: 3062: 3060: 3057: 3053: 3050: 3049: 3048: 3045: 3043: 3040: 3038: 3032: 3030: 3027: 3023: 3020: 3019: 3018: 3015: 3013: 3010: 3006: 3003: 3002: 3001: 2998: 2996: 2993: 2991: 2988: 2984: 2981: 2980: 2979: 2976: 2974: 2971: 2969: 2966: 2964: 2961: 2960: 2958: 2954: 2948: 2944: 2941: 2937: 2934: 2933: 2932: 2931:Measure space 2929: 2927: 2924: 2922: 2920: 2916: 2914: 2911: 2909: 2905: 2902: 2901: 2899: 2895: 2891: 2884: 2879: 2877: 2872: 2870: 2865: 2864: 2861: 2855: 2851: 2848: 2846: 2842: 2839: 2838: 2825: 2819: 2815: 2808: 2800: 2798:0-521-00754-2 2794: 2790: 2783: 2775: 2773:0-02-404151-3 2769: 2765: 2764:Real Analysis 2758: 2750: 2748:0-471-31716-0 2744: 2740: 2733: 2725: 2723:0-521-49756-6 2719: 2714: 2713: 2712:Real Analysis 2704: 2696: 2694:0-7637-1497-6 2690: 2685: 2684: 2675: 2673: 2671: 2669: 2664: 2654: 2651: 2649: 2646: 2643: 2640: 2638: 2622: 2618: 2608: 2605: 2602: 2601:Bochner space 2599: 2597: 2594: 2593: 2587: 2574: 2551: 2548: 2528: 2522: 2519: 2510: 2487: 2459: 2456: 2453: 2444: 2430: 2427: 2404: 2393: 2392:Borel algebra 2348: 2338: 2331: 2328: 2325: 2315: 2309: 2304: 2298: 2290: 2279: 2262: 2259: 2253: 2248: 2233: 2217: 2211: 2208: 2189: 2186: 2183: 2180: 2173: 2169: 2150: 2147: 2134: 2132: 2128: 2103: 2083: 2063: 2057: 2054: 2049: 2045: 2036: 2032: 2029: 2025: 2021: 2017: 2013: 1998: 1993: 1985: 1980: 1950: 1942: 1937: 1909: 1903: 1900: 1897: 1894: 1891: 1866: 1858: 1855: 1841: 1833: 1830: 1824: 1821: 1796: 1788: 1785: 1771: 1763: 1760: 1754: 1751: 1743: 1729: 1721: 1713: 1710: 1696: 1688: 1685: 1679: 1676: 1673: 1670: 1645: 1637: 1634: 1620: 1612: 1609: 1603: 1600: 1575: 1567: 1564: 1550: 1542: 1539: 1533: 1530: 1522: 1519: 1518: 1489: 1486: 1483: 1462: 1459: 1436: 1433: 1430: 1424: 1418: 1415: 1412: 1406: 1400: 1397: 1394: 1371: 1363: 1360: 1337: 1334: 1328: 1322: 1319: 1316: 1313: 1310: 1304: 1298: 1295: 1292: 1269: 1250: 1239: 1236: 1233: 1225: 1209: 1197: 1193: 1192:Borel algebra 1144: 1100: 1078: 1054: 1043: 1040: 1032: 1028: 1025: 1024:Borel section 1009: 1006: 998: 991: 987: 979: 975: 956: 953: 950: 935: 932: 926: 923: 915: 896: 893: 890: 861: 858: 847: 844: 843: 837: 835: 831: 827: 822: 820: 816: 815:Borel algebra 800: 776: 751: 737: 724: 679: 659: 648: 645: 630: 627: 621: 618: 598: 592: 589: 586: 578: 559: 553: 533: 527: 521: 515: 506: 493: 487: 481: 478: 472: 466: 463: 460: 457: 454: 448: 442: 434: 431: 427: 402: 399: 359: 339: 314: 311: 291: 285: 282: 279: 259: 227: 213: 192: 172: 144: 141: 112: 109: 92: 90: 86: 82: 78: 74: 73:real analysis 70: 66: 63: 59: 55: 51: 47: 43: 39: 35: 30: 19: 4071:Inequalities 4056: 4011:Uniform norm 3899: 3868: 3847: 3819: 3529:Main results 3427: 3265:Set function 3193:Metric outer 3148:Decomposable 3005:Cylinder set 2946: 2918: 2813: 2807: 2788: 2782: 2763: 2757: 2738: 2732: 2711: 2703: 2682: 2445: 2137: 2135: 2124: 1922:need not be 1023: 973: 914:Borel spaces 823: 818: 743: 507: 98: 71:is open. In 41: 31: 29: 4269:Von Neumann 4083:Chebyshev's 3489:compact set 3456:of measures 3392:Pushforward 3385:Projections 3375:Logarithmic 3218:Probability 3208:Pre-measure 2990:Borel space 2908:of measures 272:A function 34:mathematics 4286:Categories 4264:C*-algebra 4088:Clarkson's 3461:in measure 3188:Maximising 3158:Equivalent 3052:Vitali set 692:-algebras 58:continuous 54:measurable 4259:*-algebra 4244:Quasinorm 4113:Minkowski 4004:Essential 3967:∞ 3796:Lp spaces 3575:Maharam's 3545:Dominated 3358:Intensity 3353:Hausdorff 3260:Saturated 3178:Invariant 3083:Types of 3042:σ-algebra 3012:𝜆-system 2978:Borel set 2973:Baire set 2741:. Wiley. 2572:Σ 2517:∅ 2508:Σ 2500:-algebra 2488:σ 2463:→ 2329:∈ 2272:→ 2266:Σ 2215:Σ 2212:∉ 2184:⊂ 2154:Σ 2061:→ 2035:pointwise 1990:Σ 1986:⊆ 1977:Σ 1947:Σ 1934:Σ 1907:→ 1895:∘ 1863:Σ 1850:→ 1838:Σ 1793:Σ 1780:→ 1768:Σ 1718:Σ 1705:→ 1693:Σ 1674:∘ 1642:Σ 1629:→ 1617:Σ 1572:Σ 1559:→ 1547:Σ 1493:→ 1460:α 1437:α 1434:≤ 1419:α 1401:α 1398:≥ 1364:∈ 1361:α 1338:α 1314:∈ 1299:α 1243:→ 1145:σ 1068:→ 999:π 945:→ 939:Σ 865:Σ 836:, exist. 752:σ 700:Σ 680:σ 640:→ 634:Σ 622:: 596:→ 554:σ 531:Σ 528:⊆ 516:σ 508:That is, 491:Σ 488:∈ 479:∈ 464:∣ 458:∈ 432:− 403:∈ 380:Σ 315:∈ 289:→ 235:Σ 226:-algebras 214:σ 116:Σ 65:preserves 4108:Markov's 4103:Hölder's 4093:Hanner's 3910:Bessel's 3848:function 3832:Lebesgue 3592:Fubini's 3582:Egorov's 3550:Monotone 3509:variable 3487:Random: 3438:Strongly 3363:Lebesgue 3348:Harmonic 3338:Gaussian 3323:Counting 3290:Spectral 3285:Singular 3275:s-finite 3270:σ-finite 3153:Discrete 3128:Complete 3085:Measures 3059:Null set 2947:function 2607:Lp space 2590:See also 2016:supremum 992:→ 69:open set 50:preimage 4128:Results 3827:Measure 3504:process 3499:measure 3494:element 3433:Bochner 3407:Trivial 3402:Tangent 3380:Product 3238:Regular 3216:)  3203:Perfect 3176:)  3141:)  3133:Content 3123:Complex 3064:Support 3037:-system 2926:Measure 2443:  2170:with a 2020:infimum 1194:on the 1190:is the 1137:is the 575:is the 52:of any 3981:spaces 3902:spaces 3871:spaces 3822:spaces 3810:Banach 3570:Jordan 3555:Vitali 3514:vector 3443:Weakly 3305:Vector 3280:Signed 3233:Random 3174:Quasi- 3163:Finite 3143:Convex 3103:Banach 3093:Atomic 2921:spaces 2906:  2820:  2795:  2770:  2745:  2720:  2691:  2637:spaces 2368:where 2026:, and 1113:where 1002:  996:  546:where 372:is in 352:under 3412:Young 3333:Euler 3328:Dirac 3300:Tight 3228:Radon 3198:Outer 3168:Inner 3118:Brown 3113:Borel 3108:Besov 3098:Baire 2659:Notes 579:. If 79:. In 4166:For 4020:Maps 3676:For 3565:Hahn 3421:Maps 3343:Haar 3214:Sub- 2968:Atom 2956:Sets 2818:ISBN 2793:ISBN 2768:ISBN 2743:ISBN 2718:ISBN 2689:ISBN 2033:The 1814:and 1593:and 1416:< 1335:> 1296:> 912:are 880:and 832:and 712:and 247:and 185:and 131:and 99:Let 40:, a 2852:at 2843:at 2234:: 1744:If 1523:If 848:If 32:In 4288:: 2667:^ 2022:, 2018:, 1029:A 449::= 91:. 3963:L 3900:L 3869:L 3846:/ 3820:L 3788:e 3781:t 3774:v 3212:( 3172:( 3137:( 3035:π 2945:/ 2919:L 2882:e 2875:t 2868:v 2826:. 2801:. 2776:. 2751:. 2726:. 2697:. 2623:p 2619:L 2575:. 2552:, 2549:X 2529:, 2526:} 2523:X 2520:, 2514:{ 2511:= 2467:R 2460:X 2457:: 2454:f 2431:. 2428:A 2408:} 2405:1 2402:{ 2377:R 2349:, 2339:0 2332:A 2326:x 2316:1 2310:{ 2305:= 2302:) 2299:x 2296:( 2291:A 2286:1 2280:, 2276:R 2269:) 2263:, 2260:X 2257:( 2254:: 2249:A 2244:1 2218:, 2209:A 2190:, 2187:X 2181:A 2157:) 2151:, 2148:X 2145:( 2104:Y 2084:Y 2064:Y 2058:X 2055:: 2050:n 2046:f 1999:. 1994:2 1981:3 1956:) 1951:4 1943:, 1938:1 1930:( 1910:Z 1904:X 1901:: 1898:f 1892:g 1872:) 1867:4 1859:, 1856:Z 1853:( 1847:) 1842:3 1834:, 1831:Y 1828:( 1825:: 1822:g 1802:) 1797:2 1789:, 1786:Y 1783:( 1777:) 1772:1 1764:, 1761:X 1758:( 1755:: 1752:f 1730:. 1727:) 1722:3 1714:, 1711:Z 1708:( 1702:) 1697:1 1689:, 1686:X 1683:( 1680:: 1677:f 1671:g 1651:) 1646:3 1638:, 1635:Z 1632:( 1626:) 1621:2 1613:, 1610:Y 1607:( 1604:: 1601:g 1581:) 1576:2 1568:, 1565:Y 1562:( 1556:) 1551:1 1543:, 1540:X 1537:( 1534:: 1531:f 1497:C 1490:X 1487:: 1484:f 1463:, 1440:} 1431:f 1428:{ 1425:, 1422:} 1413:f 1410:{ 1407:, 1404:} 1395:f 1392:{ 1372:. 1368:R 1341:} 1332:) 1329:x 1326:( 1323:f 1320:: 1317:X 1311:x 1308:{ 1305:= 1302:} 1293:f 1290:{ 1270:f 1251:, 1247:R 1240:X 1237:: 1234:f 1210:. 1206:C 1175:C 1168:B 1123:L 1101:, 1098:) 1092:C 1085:B 1079:, 1075:C 1071:( 1065:) 1060:L 1055:, 1051:R 1047:( 1044:: 1041:f 1026:. 1010:, 1007:X 988:Y 960:) 957:T 954:, 951:Y 948:( 942:) 936:, 933:X 930:( 927:: 924:f 900:) 897:T 894:, 891:Y 888:( 868:) 862:, 859:X 856:( 801:, 797:C 777:, 773:R 725:. 721:T 660:. 657:) 653:T 649:, 646:Y 643:( 637:) 631:, 628:X 625:( 619:f 599:Y 593:X 590:: 587:f 563:) 560:f 557:( 534:, 525:) 522:f 519:( 494:. 485:} 482:E 476:) 473:x 470:( 467:f 461:X 455:x 452:{ 446:) 443:E 440:( 435:1 428:f 407:T 400:E 360:f 340:E 319:T 312:E 292:Y 286:X 283:: 280:f 260:. 256:T 193:Y 173:X 153:) 149:T 145:, 142:Y 139:( 119:) 113:, 110:X 107:( 20:)

Index

Borel function
mathematics
measure theory
measurable spaces
preimage
measurable
continuous
topological spaces
preserves
open set
real analysis
Lebesgue integral
probability theory
probability space
random variable
σ {\displaystyle \sigma } -algebras
σ-algebra generated by f
Borel algebra
infinite-dimensional vector space
weak measurability
Bochner measurability
Borel spaces
Luzin's theorem
Lebesgue measurable
Borel algebra
complex numbers
mathematical analysis
supremum
infimum
limit superior

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