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Local property

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and the line are very different objects. One cannot stretch the circle to look like the line, nor compress the line to fit on the circle without gaps or overlaps. However, a small piece of the circle can be stretched and flattened out to look like a small piece of the line. For this reason, one
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Here, note that condition (2) is for the most part stronger than condition (1), and that extra caution should be taken to distinguish between the two. For example, some variation in the definition of
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of points. This is to be contrasted with the idea of global minimum (or global maximum), which corresponds to the minimum (resp., maximum) of the function across its entire domain.
258:. In which case, a property is said to be local if it can be detected from the local subgroups. Global and local properties formed a significant portion of the early work on the 167:, two spaces are said to be locally equivalent if every point of the first space has a neighborhood which is equivalent to a neighborhood of the second space. 259: 220:
if every finitely generated subgroup is finite, and a group is locally soluble if every finitely generated subgroup is
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of a sphere (e.g., a person and the Earth) would find it indistinguishable from a plane.
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and the plane are locally equivalent. A small enough observer standing on the
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Perhaps the best-known example of the idea of locality lies in the concept of
409: 221: 152: 59: 55: 237: 233: 297: 293: 285: 236:, a "small neighborhood" is taken to be a subgroup defined in terms of a 28: 289: 271: 248: 105:
can arise as a result of the different choices of these conditions.
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make it natural to take a "small neighborhood" of a ring to be the
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may say that the circle and the line are locally equivalent.
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over a commutative ring is a local property, but being a
49: 31:, a mathematical object is said to satisfy a property 265: 146: 407: 189: 69: 338:"Definition of local-maximum | Dictionary.com" 227: 262:, which was carried out during the 1960s. 198:, a "small neighborhood" is taken to be a 212:if every finitely generated subgroup is 151:Given some notion of equivalence (e.g., 78:is sometimes said to exhibit a property 14: 408: 260:classification of finite simple groups 360: 387:"Maxima, minima, and saddle points" 205:. An infinite group is said to be 50:Properties of a point on a function 24: 25: 432: 276:For commutative rings, ideas of 97:of sets exhibiting the property. 266:Properties of commutative rings 379: 354: 330: 147:Properties of a pair of spaces 13: 1: 324: 190:Properties of infinite groups 216:. For instance, a group is 70:Properties of a single space 7: 307: 228:Properties of finite groups 108: 10: 437: 269: 292:. For instance, being a 314:Local path connectedness 302:Localization of a module 90:exhibiting the property; 319:Local-global principle 300:is not. For more, see 125:Locally path-connected 367:mathworld.wolfram.com 361:Weisstein, Eric W. 133:, Locally regular, 342:www.dictionary.com 278:algebraic geometry 251:of the nontrivial 200:finitely generated 170:For instance, the 165:topological spaces 141:Locally metrizable 127:topological spaces 117:topological spaces 37:sufficiently small 131:Locally Hausdorff 121:Locally connected 95:neighborhood base 93:Each point has a 86:Each point has a 76:topological space 41:arbitrarily small 16:(Redirected from 428: 416:General topology 401: 400: 398: 397: 383: 377: 376: 374: 373: 358: 352: 351: 349: 348: 334: 21: 436: 435: 431: 430: 429: 427: 426: 425: 406: 405: 404: 395: 393: 385: 384: 380: 371: 369: 363:"Local Minimum" 359: 355: 346: 344: 336: 335: 331: 327: 310: 274: 268: 245:local subgroups 230: 192: 178:Similarly, the 149: 115:Locally compact 111: 103:locally compact 72: 52: 23: 22: 15: 12: 11: 5: 434: 424: 423: 421:Homeomorphisms 418: 403: 402: 378: 353: 328: 326: 323: 322: 321: 316: 309: 306: 270:Main article: 267: 264: 243:, usually the 229: 226: 218:locally finite 196:infinite group 191: 188: 157:diffeomorphism 148: 145: 144: 143: 138: 135:Locally normal 128: 118: 110: 107: 99: 98: 91: 71: 68: 51: 48: 9: 6: 4: 3: 2: 433: 422: 419: 417: 414: 413: 411: 392: 388: 382: 368: 364: 357: 343: 339: 333: 329: 320: 317: 315: 312: 311: 305: 303: 299: 295: 291: 287: 283: 279: 273: 263: 261: 257: 255: 250: 246: 242: 239: 235: 234:finite groups 225: 223: 219: 215: 211: 210: 204: 201: 197: 187: 185: 181: 176: 173: 168: 166: 162: 158: 154: 153:homeomorphism 142: 139: 136: 132: 129: 126: 122: 119: 116: 113: 112: 106: 104: 96: 92: 89: 85: 84: 83: 81: 77: 67: 65: 61: 60:local maximum 57: 56:local minimum 47: 45: 44:neighborhoods 42: 38: 34: 30: 19: 394:. Retrieved 391:Khan Academy 390: 381: 370:. Retrieved 366: 356: 345:. Retrieved 341: 332: 282:localization 275: 253: 244: 240: 238:prime number 231: 213: 208: 206: 193: 177: 169: 150: 100: 88:neighborhood 79: 73: 64:neighborhood 53: 46:of points). 40: 36: 32: 26: 298:free module 294:flat module 290:local rings 286:prime ideal 249:normalizers 29:mathematics 410:Categories 396:2019-11-30 372:2019-11-30 347:2019-11-30 325:References 272:local ring 256:-subgroups 163:) between 308:See also 207:locally 203:subgroup 161:isometry 109:Examples 222:soluble 194:For an 184:surface 80:locally 33:locally 18:Locally 247:, the 180:sphere 172:circle 137:etc... 284:at a 232:For 123:and 58:(or 39:or 27:In 412:: 389:. 365:. 340:. 304:. 224:. 159:, 155:, 74:A 399:. 375:. 350:. 254:p 241:p 214:P 209:P 20:)

Index

Locally
mathematics
neighborhoods
local minimum
local maximum
neighborhood
topological space
neighborhood
neighborhood base
locally compact
Locally compact
Locally connected
Locally path-connected
Locally Hausdorff
Locally normal
Locally metrizable
homeomorphism
diffeomorphism
isometry
topological spaces
circle
sphere
surface
infinite group
finitely generated
subgroup
locally finite
soluble
finite groups
prime number

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