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Null set

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45: 645: 2031:. Any non-complete measure can be completed to form a complete measure by asserting that subsets of null sets have measure zero. Lebesgue measure is an example of a complete measure; in some constructions, it is defined as the completion of a non-complete 249:
Every finite or countably infinite subset of the real numbers is a null set. For example, the set of natural numbers and the set of rational numbers are both countably infinite and therefore are null sets when considered as subsets of the real numbers.
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zero, there are also non-empty sets which are null. For example, any non-empty countable set of real numbers has Lebesgue measure zero and therefore is null.
4320: 4398: 4415: 3347: 640:{\displaystyle A\subseteq \bigcup _{n=1}^{\infty }U_{n}\ ~{\textrm {and}}~\ \sum _{n=1}^{\infty }\operatorname {length} (U_{n})<\varepsilon \,,} 3439: 3723: 3582: 3339: 459: 392: 4238: 4069: 3551: 3532: 3513: 3277: 3140:
The term refers to the null invariance of the measures of translates, associating it with the complete invariance found with
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First, we have to know that every set of positive measure contains a nonmeasurable subset. Let
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have been related to the size of subsets and Haar null sets. Haar null sets have been used in
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however other constructions are possible which assign the Cantor set any measure whatsoever.
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which is closed hence Borel measurable, and which has measure zero, and to find a subset
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The Borel measure is not complete. One simple construction is to start with the standard
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which is not Borel measurable. (Since the Lebesgue measure is complete, this
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as sets of equivalence classes of functions which differ only on null sets.
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is, and their integrals are equal. This motivates the formal definition of
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instead of intervals. In fact, the idea can be made to make sense on any
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Dodos, Pandelis (2009). "The Steinhaus property and Haar-null sets".
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Solecki, S. (2005). "Sizes of subsets of groups and Haar null sets".
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In terms of null sets, the following equivalence has been styled a
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has null Lebesgue measure and is considered to be a null set in
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Any (measurable) subset of a null set is itself a null set (by
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van Douwen, Eric K. (1989). "Fubini's theorem for null sets".
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would also be Borel measurable (here we use the fact that the
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A measure in which all subsets of null sets are measurable is
3220: â€“ Continuous function that is not absolutely continuous 2327:
is countable, since it contains one point per component of
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is a null set. However, if it were Borel measurable, then
514:{\displaystyle \operatorname {length} (U_{n})=b_{n}-a_{n}} 449:{\displaystyle U_{n}=(a_{n},b_{n})\subseteq \mathbb {R} } 2039:
A subset of the Cantor set which is not Borel measurable
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For instance straight lines or circles are null sets in
3232: â€“ Generalization of mass, length, area and volume 2726:
of a Borel set by a continuous function is measurable;
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The notion of null set should not be confused with the
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is a null set, also known as a set of zero-content.
1908:Null sets play a key role in the definition of the 3260:. The Student Mathematical Library. Vol. 48. 3188: 3125: 3105: 3062: 3039: 3003: 2974: 2948: 2922: 2867: 2847: 2808: 2788: 2714: 2685: 2665: 2636: 2616: 2568: 2533: 2500: 2471: 2414: 2385: 2349: 2319: 2283: 2248: 2213: 2178: 2144: 2121: 2101: 2081: 2061: 2012: 1984: 1964: 1944: 1924: 1892: 1793: 1727: 1684: 1646: 1617: 1595: 1562: 1530: 1498: 1474: 1442: 1407: 1374: 1344: 1297: 1277: 1242: 1219: 1173: 1153: 1127: 1075: 1043: 1021: 999: 940: 913: 871: 844: 810: 786: 744: 694: 659: 639: 513: 448: 377: 331: 302: 277: 234: 199: 173: 104:. This can be characterized as a set that can be 73: 883:Together, these facts show that the null sets of 4468: 3348:Proceedings of the American Mathematical Society 3226: â€“ Mathematical set containing no elements 1227:and the total length of the union is less than 948:. Accordingly, null sets may be interpreted as 3258:A (Terse) Introduction to Lebesgue Integration 2508:is strictly monotonic and continuous, it is a 1313:, even if there is no Lebesgue measure there. 3576: 1685:{\displaystyle \lambda \times \lambda =\pi .} 4321:Riesz–Markov–Kakutani representation theorem 3503: 2911: 2905: 1785: 1755: 3440:Bulletin of the London Mathematical Society 674:, this definition requires that there be a 4416:Vitale's random Brunn–Minkowski inequality 3583: 3569: 3337: 3292: 1829: 1825: 952:, yielding a measure-theoretic notion of " 257:is an example of an uncountable null set. 3452: 3397: 3360: 2875:is a null, but non-Borel measurable set. 1728:{\displaystyle A\subset \mathbb {R} ^{2}} 1715: 1634: 1611: 1547: 1515: 1462: 1433: 1398: 1368: 1329: 1262: 1147: 1037: 1015: 633: 442: 296: 61: 52:is an example of a null set of points in 3525:Lebesgue Integration on Euclidean Spaces 3504:Capinski, Marek; Kopp, Ekkehard (2005). 43: 37:For the set of zeros of a function, see 3383: 1794:{\displaystyle A_{x}=\{y:(x,y)\in A\},} 14: 4469: 3541: 3255: 1579:of a smooth function has measure zero. 828:of null sets is itself a null set (by 706:of the lengths of the covers is zero. 3564: 3527:. Jones & Bartlett. p. 107. 3522: 3436: 3196:contains an open neighborhood of the 2789:{\displaystyle g(F)=(g^{-1})^{-1}(F)} 1952:are equal except on a null set, then 1253:This condition can be generalised to 4429:Applications & related 2422:has measure one. We need a strictly 787:{\displaystyle \mu (\varnothing )=0} 116:of arbitrarily small total length. 27:Measurable set whose measure is zero 2129:is of course Lebesgue measurable.) 1220:{\displaystyle I_{1},I_{2},\ldots } 1128:{\displaystyle I_{1},I_{2},\ldots } 968:is the standard way of assigning a 959: 378:{\displaystyle U_{1},U_{2},\ldots } 24: 3590: 3497: 3204:since it is the conclusion of the 935: 899: 730: 600: 550: 332:{\displaystyle \varepsilon >0,} 194: 174:{\displaystyle M=(X,\Sigma ,\mu )} 159: 30:For the set with no elements, see 25: 4493: 3506:Measure, Integral and Probability 3386:Geometric and Functional Analysis 1563:{\displaystyle \mathbb {R} ^{2}.} 1531:{\displaystyle \mathbb {R} ^{n}.} 1417:The standard construction of the 1360:are null. In particular, the set 1345:{\displaystyle \mathbb {R} ^{n},} 1278:{\displaystyle \mathbb {R} ^{n},} 1181:is contained in the union of the 772: 4358:Lebesgue differentiation theorem 4239:CarathĂ©odory's extension theorem 2816:through the continuous function 2186:and monotonically increasing on 1647:{\displaystyle \mathbb {R} ^{2}} 1475:{\displaystyle \mathbb {R} ^{n}} 914:{\displaystyle (X,\Sigma ,\mu )} 745:{\displaystyle (X,\Sigma ,\mu )} 74:{\displaystyle \mathbb {R} ^{2}} 2923:{\displaystyle (X,\|\cdot \|).} 2569:{\displaystyle E\subseteq g(K)} 3546:. Springer-Verlag. p. 3. 3430: 3377: 3340:"Convexity and Haar Null Sets" 3331: 3309:10.1080/00029890.1989.11972270 3286: 3249: 3091: 3079: 2914: 2896: 2783: 2777: 2765: 2748: 2742: 2736: 2709: 2703: 2608: 2602: 2563: 2557: 2528: 2522: 2495: 2489: 2457: 2451: 2442: 2436: 2409: 2403: 2380: 2367: 2314: 2301: 2272: 2266: 2237: 2231: 2205: 2193: 1826: 1816: 1810: 1776: 1764: 1625:and π is Lebesgue measure for 1506:have null Lebesgue measure in 908: 890: 775: 769: 739: 721: 624: 611: 482: 469: 435: 409: 223: 217: 168: 150: 13: 1: 3362:10.1090/S0002-9939-97-03776-3 3296:American Mathematical Monthly 3262:American Mathematical Society 3242: 3200:. This property is named for 3147:Some algebraic properties of 2666:{\displaystyle F\subseteq K,} 1972:is integrable if and only if 1443:{\displaystyle \mathbb {R} ;} 1408:{\displaystyle \mathbb {R} .} 1386:is a null set, despite being 1243:{\displaystyle \varepsilon .} 1076:{\displaystyle \varepsilon ,} 709: 260: 127:. Although the empty set has 3106:{\displaystyle \mu (A+x)=0,} 2949:{\displaystyle A\subseteq X} 2878: 2617:{\displaystyle F=g^{-1}(E).} 2472:{\displaystyle g(x)=f(x)+x.} 1618:{\displaystyle \mathbb {R} } 1375:{\displaystyle \mathbb {Q} } 1356:are null, and therefore all 1154:{\displaystyle \mathbb {R} } 1044:{\displaystyle \mathbb {R} } 1022:{\displaystyle \mathbb {R} } 303:{\displaystyle \mathbb {R} } 200:{\displaystyle S\in \Sigma } 7: 4411:PrĂ©kopa–Leindler inequality 3211: 2644:is injective, we have that 2576:be non-measurable, and let 244: 134:More generally, on a given 10: 4498: 4353:Lebesgue's density theorem 2930:addition moves any subset 235:{\displaystyle \mu (S)=0.} 36: 29: 4428: 4406:Minkowski–Steiner formula 4376: 4336: 4329: 4229: 4221:Projection-valued measure 4122: 4015: 3784: 3657: 3598: 3408:10.1007/s00039-005-0505-z 2848:{\displaystyle h=g^{-1}.} 97:of real numbers that has 4389:Isoperimetric inequality 4368:Vitali–Hahn–Saks theorem 3697:CarathĂ©odory's criterion 3542:Oxtoby, John C. (1971). 3508:. Springer. p. 16. 3338:Matouskova, Eva (1997). 2386:{\displaystyle f(K^{c})} 2320:{\displaystyle f(K^{c})} 1603:is Lebesgue measure for 1596:{\displaystyle \lambda } 1421:is an example of a null 339:there exists a sequence 4394:Brunn–Minkowski theorem 4263:Decomposition theorems 3189:{\displaystyle A^{-1}A} 3004:{\displaystyle x\in X.} 2284:{\displaystyle f(1)=1.} 1903: 941:{\displaystyle \Sigma } 830:countable subadditivity 95:Lebesgue measurable set 4441:Descriptive set theory 4341:Disintegration theorem 3776:Universally measurable 3190: 3127: 3107: 3064: 3041: 3005: 2976: 2950: 2924: 2869: 2849: 2810: 2790: 2716: 2687: 2667: 2638: 2618: 2570: 2535: 2502: 2473: 2416: 2387: 2351: 2350:{\displaystyle K^{c}.} 2321: 2285: 2250: 2249:{\displaystyle f(0)=0} 2215: 2180: 2179:{\displaystyle K^{c},} 2146: 2123: 2103: 2083: 2063: 2014: 1986: 1966: 1946: 1926: 1894: 1795: 1729: 1686: 1648: 1619: 1597: 1564: 1532: 1500: 1476: 1444: 1409: 1376: 1346: 1299: 1279: 1244: 1221: 1175: 1155: 1129: 1077: 1045: 1023: 1001: 942: 915: 873: 846: 812: 788: 746: 696: 661: 641: 604: 554: 515: 450: 379: 333: 304: 279: 236: 201: 175: 82: 75: 4243:Convergence theorems 3702:Cylindrical σ-algebra 3523:Jones, Frank (1993). 3256:Franks, John (2009). 3230:Measure (mathematics) 3191: 3128: 3108: 3065: 3042: 3006: 2977: 2951: 2925: 2870: 2850: 2811: 2791: 2717: 2688: 2668: 2639: 2619: 2571: 2541:has measure one. Let 2536: 2503: 2474: 2417: 2393:has measure zero, so 2388: 2352: 2322: 2286: 2251: 2216: 2181: 2147: 2124: 2104: 2084: 2064: 2015: 2013:{\displaystyle L^{p}} 1987: 1967: 1947: 1927: 1895: 1796: 1730: 1687: 1649: 1620: 1598: 1565: 1533: 1501: 1477: 1445: 1410: 1377: 1347: 1300: 1280: 1245: 1222: 1176: 1156: 1130: 1078: 1046: 1024: 1002: 943: 916: 874: 847: 813: 789: 747: 697: 672:mathematical analysis 662: 642: 584: 534: 516: 451: 380: 334: 305: 280: 237: 202: 176: 87:mathematical analysis 76: 47: 4311:Minkowski inequality 4185:Cylinder set measure 4070:Infinite-dimensional 3685:equivalence relation 3615:Lebesgue integration 3544:Measure and Category 3167: 3117: 3073: 3051: 3028: 3020:on the σ-algebra of 2986: 2960: 2934: 2893: 2859: 2820: 2800: 2730: 2715:{\displaystyle f(F)} 2697: 2677: 2648: 2628: 2580: 2545: 2534:{\displaystyle g(K)} 2516: 2501:{\displaystyle f(x)} 2483: 2430: 2415:{\displaystyle f(K)} 2397: 2361: 2331: 2295: 2260: 2225: 2190: 2160: 2136: 2113: 2093: 2073: 2050: 1997: 1976: 1956: 1936: 1916: 1804: 1739: 1704: 1661: 1629: 1607: 1587: 1542: 1510: 1490: 1457: 1429: 1394: 1364: 1324: 1289: 1257: 1231: 1185: 1165: 1143: 1093: 1064: 1033: 1011: 991: 932: 887: 872:{\displaystyle \mu } 863: 845:{\displaystyle \mu } 836: 811:{\displaystyle \mu } 802: 763: 718: 686: 651: 525: 460: 393: 343: 314: 310:such that for every 292: 269: 211: 185: 181:a null set is a set 141: 56: 4306:Hölder's inequality 4168:of random variables 4130:Measurable function 4017:Particular measures 3606:Absolute continuity 3471:10.1112/blms/bdp014 3463:2010arXiv1006.2675D 3013:probability measure 2975:{\displaystyle A+x} 2796:is the preimage of 1453:All the subsets of 285:is a subset of the 50:SierpiƄski triangle 4446:Probability theory 3771:Transverse measure 3749:Non-measurable set 3731:Locally measurable 3186: 3155:to show that when 3149:topological groups 3123: 3103: 3063:{\displaystyle x,} 3060: 3047:such that for all 3040:{\displaystyle X,} 3037: 3001: 2972: 2956:to the translates 2946: 2920: 2865: 2845: 2806: 2786: 2712: 2683: 2663: 2634: 2614: 2566: 2531: 2498: 2469: 2424:monotonic function 2412: 2383: 2347: 2317: 2281: 2246: 2211: 2176: 2142: 2119: 2099: 2079: 2062:{\displaystyle K,} 2059: 2010: 1982: 1962: 1942: 1922: 1890: 1791: 1725: 1682: 1644: 1615: 1593: 1560: 1528: 1496: 1472: 1440: 1405: 1372: 1342: 1295: 1275: 1240: 1217: 1171: 1151: 1125: 1073: 1041: 1019: 997: 938: 911: 869: 842: 808: 784: 742: 692: 670:In terminology of 657: 637: 511: 446: 375: 329: 300: 275: 232: 197: 171: 83: 71: 4464: 4463: 4424: 4423: 4153:almost everywhere 4099:Spherical measure 3997:Strictly positive 3925:Projection-valued 3665:Almost everywhere 3638:Probability space 3553:978-0-387-05349-3 3534:978-0-86720-203-8 3515:978-1-85233-781-0 3279:978-0-8218-4862-3 3206:Steinhaus theorem 3126:{\displaystyle A} 2868:{\displaystyle F} 2809:{\displaystyle F} 2686:{\displaystyle F} 2637:{\displaystyle g} 2214:{\displaystyle ,} 2145:{\displaystyle f} 2122:{\displaystyle F} 2102:{\displaystyle K} 2082:{\displaystyle F} 1985:{\displaystyle g} 1965:{\displaystyle f} 1945:{\displaystyle g} 1925:{\displaystyle f} 1910:Lebesgue integral 1499:{\displaystyle n} 1298:{\displaystyle n} 1174:{\displaystyle N} 1000:{\displaystyle N} 954:almost everywhere 695:{\displaystyle A} 660:{\displaystyle A} 583: 580: 575: 570: 567: 278:{\displaystyle A} 16:(Redirected from 4489: 4399:Milman's reverse 4382: 4380:Lebesgue measure 4334: 4333: 3738: 3724:infimum/supremum 3645:Measurable space 3585: 3578: 3571: 3562: 3561: 3557: 3538: 3519: 3491: 3490: 3456: 3434: 3428: 3427: 3401: 3381: 3375: 3374: 3364: 3355:(6): 1793–1799. 3344: 3335: 3329: 3328: 3290: 3284: 3283: 3270:10.1090/stml/048 3253: 3198:identity element 3195: 3193: 3192: 3187: 3182: 3181: 3158: 3132: 3130: 3129: 3124: 3112: 3110: 3109: 3104: 3069: 3067: 3066: 3061: 3046: 3044: 3043: 3038: 3019: 3011:When there is a 3010: 3008: 3007: 3002: 2981: 2979: 2978: 2973: 2955: 2953: 2952: 2947: 2929: 2927: 2926: 2921: 2874: 2872: 2871: 2866: 2854: 2852: 2851: 2846: 2841: 2840: 2815: 2813: 2812: 2807: 2795: 2793: 2792: 2787: 2776: 2775: 2763: 2762: 2721: 2719: 2718: 2713: 2692: 2690: 2689: 2684: 2672: 2670: 2669: 2664: 2643: 2641: 2640: 2635: 2623: 2621: 2620: 2615: 2601: 2600: 2575: 2573: 2572: 2567: 2540: 2538: 2537: 2532: 2507: 2505: 2504: 2499: 2478: 2476: 2475: 2470: 2421: 2419: 2418: 2413: 2392: 2390: 2389: 2384: 2379: 2378: 2356: 2354: 2353: 2348: 2343: 2342: 2326: 2324: 2323: 2318: 2313: 2312: 2290: 2288: 2287: 2282: 2255: 2253: 2252: 2247: 2220: 2218: 2217: 2212: 2185: 2183: 2182: 2177: 2172: 2171: 2151: 2149: 2148: 2143: 2128: 2126: 2125: 2120: 2108: 2106: 2105: 2100: 2088: 2086: 2085: 2080: 2068: 2066: 2065: 2060: 2019: 2017: 2016: 2011: 2009: 2008: 1991: 1989: 1988: 1983: 1971: 1969: 1968: 1963: 1951: 1949: 1948: 1943: 1931: 1929: 1928: 1923: 1899: 1897: 1896: 1891: 1883: 1879: 1875: 1868: 1864: 1863: 1800: 1798: 1797: 1792: 1751: 1750: 1734: 1732: 1731: 1726: 1724: 1723: 1718: 1694:Fubini's theorem 1691: 1689: 1688: 1683: 1653: 1651: 1650: 1645: 1643: 1642: 1637: 1624: 1622: 1621: 1616: 1614: 1602: 1600: 1599: 1594: 1569: 1567: 1566: 1561: 1556: 1555: 1550: 1537: 1535: 1534: 1529: 1524: 1523: 1518: 1505: 1503: 1502: 1497: 1486:is smaller than 1481: 1479: 1478: 1473: 1471: 1470: 1465: 1449: 1447: 1446: 1441: 1436: 1414: 1412: 1411: 1406: 1401: 1384:rational numbers 1381: 1379: 1378: 1373: 1371: 1351: 1349: 1348: 1343: 1338: 1337: 1332: 1320:With respect to 1304: 1302: 1301: 1296: 1284: 1282: 1281: 1276: 1271: 1270: 1265: 1249: 1247: 1246: 1241: 1226: 1224: 1223: 1218: 1210: 1209: 1197: 1196: 1180: 1178: 1177: 1172: 1160: 1158: 1157: 1152: 1150: 1134: 1132: 1131: 1126: 1118: 1117: 1105: 1104: 1082: 1080: 1079: 1074: 1051:if and only if: 1050: 1048: 1047: 1042: 1040: 1028: 1026: 1025: 1020: 1018: 1006: 1004: 1003: 998: 966:Lebesgue measure 960:Lebesgue measure 947: 945: 944: 939: 920: 918: 917: 912: 878: 876: 875: 870: 851: 849: 848: 843: 817: 815: 814: 809: 793: 791: 790: 785: 751: 749: 748: 743: 701: 699: 698: 693: 666: 664: 663: 658: 646: 644: 643: 638: 623: 622: 603: 598: 581: 578: 577: 576: 573: 568: 565: 564: 563: 553: 548: 520: 518: 517: 512: 510: 509: 497: 496: 481: 480: 455: 453: 452: 447: 445: 434: 433: 421: 420: 405: 404: 389:(where interval 384: 382: 381: 376: 368: 367: 355: 354: 338: 336: 335: 330: 309: 307: 306: 301: 299: 284: 282: 281: 276: 241: 239: 238: 233: 206: 204: 203: 198: 180: 178: 177: 172: 129:Lebesgue measure 80: 78: 77: 72: 70: 69: 64: 21: 4497: 4496: 4492: 4491: 4490: 4488: 4487: 4486: 4467: 4466: 4465: 4460: 4456:Spectral theory 4436:Convex analysis 4420: 4377: 4372: 4325: 4225: 4173:in distribution 4118: 4011: 3841:Logarithmically 3780: 3736: 3719:Essential range 3653: 3594: 3589: 3554: 3535: 3516: 3500: 3498:Further reading 3495: 3494: 3435: 3431: 3399:10.1.1.133.7074 3382: 3378: 3342: 3336: 3332: 3291: 3287: 3280: 3254: 3250: 3245: 3218:Cantor function 3214: 3174: 3170: 3168: 3165: 3164: 3156: 3118: 3115: 3114: 3074: 3071: 3070: 3052: 3049: 3048: 3029: 3026: 3025: 3015: 2987: 2984: 2983: 2961: 2958: 2957: 2935: 2932: 2931: 2894: 2891: 2890: 2881: 2860: 2857: 2856: 2833: 2829: 2821: 2818: 2817: 2801: 2798: 2797: 2768: 2764: 2755: 2751: 2731: 2728: 2727: 2698: 2695: 2694: 2678: 2675: 2674: 2649: 2646: 2645: 2629: 2626: 2625: 2593: 2589: 2581: 2578: 2577: 2546: 2543: 2542: 2517: 2514: 2513: 2512:. Furthermore, 2484: 2481: 2480: 2431: 2428: 2427: 2398: 2395: 2394: 2374: 2370: 2362: 2359: 2358: 2338: 2334: 2332: 2329: 2328: 2308: 2304: 2296: 2293: 2292: 2261: 2258: 2257: 2226: 2223: 2222: 2191: 2188: 2187: 2167: 2163: 2161: 2158: 2157: 2154:Cantor function 2137: 2134: 2133: 2114: 2111: 2110: 2094: 2091: 2090: 2074: 2071: 2070: 2051: 2048: 2047: 2041: 2004: 2000: 1998: 1995: 1994: 1977: 1974: 1973: 1957: 1954: 1953: 1937: 1934: 1933: 1917: 1914: 1913: 1912:: if functions 1906: 1859: 1855: 1851: 1841: 1837: 1833: 1805: 1802: 1801: 1746: 1742: 1740: 1737: 1736: 1719: 1714: 1713: 1705: 1702: 1701: 1662: 1659: 1658: 1656:product measure 1638: 1633: 1632: 1630: 1627: 1626: 1610: 1608: 1605: 1604: 1588: 1585: 1584: 1577:critical values 1551: 1546: 1545: 1543: 1540: 1539: 1519: 1514: 1513: 1511: 1508: 1507: 1491: 1488: 1487: 1466: 1461: 1460: 1458: 1455: 1454: 1432: 1430: 1427: 1426: 1423:uncountable set 1397: 1395: 1392: 1391: 1367: 1365: 1362: 1361: 1333: 1328: 1327: 1325: 1322: 1321: 1290: 1287: 1286: 1266: 1261: 1260: 1258: 1255: 1254: 1232: 1229: 1228: 1205: 1201: 1192: 1188: 1186: 1183: 1182: 1166: 1163: 1162: 1146: 1144: 1141: 1140: 1113: 1109: 1100: 1096: 1094: 1091: 1090: 1065: 1062: 1061: 1059:positive number 1036: 1034: 1031: 1030: 1014: 1012: 1009: 1008: 992: 989: 988: 982:Euclidean space 962: 950:negligible sets 933: 930: 929: 888: 885: 884: 864: 861: 860: 837: 834: 833: 803: 800: 799: 764: 761: 760: 719: 716: 715: 712: 687: 684: 683: 652: 649: 648: 618: 614: 599: 588: 572: 571: 559: 555: 549: 538: 526: 523: 522: 505: 501: 492: 488: 476: 472: 461: 458: 457: 441: 429: 425: 416: 412: 400: 396: 394: 391: 390: 363: 359: 350: 346: 344: 341: 340: 315: 312: 311: 295: 293: 290: 289: 270: 267: 266: 263: 247: 212: 209: 208: 186: 183: 182: 142: 139: 138: 65: 60: 59: 57: 54: 53: 42: 35: 28: 23: 22: 15: 12: 11: 5: 4495: 4485: 4484: 4479: 4477:Measure theory 4462: 4461: 4459: 4458: 4453: 4448: 4443: 4438: 4432: 4430: 4426: 4425: 4422: 4421: 4419: 4418: 4413: 4408: 4403: 4402: 4401: 4391: 4385: 4383: 4374: 4373: 4371: 4370: 4365: 4363:Sard's theorem 4360: 4355: 4350: 4349: 4348: 4346:Lifting theory 4337: 4331: 4327: 4326: 4324: 4323: 4318: 4313: 4308: 4303: 4302: 4301: 4299:Fubini–Tonelli 4291: 4286: 4281: 4280: 4279: 4274: 4269: 4261: 4260: 4259: 4254: 4249: 4241: 4235: 4233: 4227: 4226: 4224: 4223: 4218: 4213: 4208: 4203: 4198: 4193: 4187: 4182: 4181: 4180: 4178:in probability 4175: 4165: 4160: 4155: 4149: 4148: 4147: 4142: 4137: 4126: 4124: 4120: 4119: 4117: 4116: 4111: 4106: 4101: 4096: 4091: 4090: 4089: 4079: 4074: 4073: 4072: 4062: 4057: 4052: 4047: 4042: 4037: 4032: 4027: 4021: 4019: 4013: 4012: 4010: 4009: 4004: 3999: 3994: 3989: 3984: 3979: 3974: 3969: 3964: 3959: 3958: 3957: 3952: 3947: 3937: 3932: 3927: 3922: 3912: 3907: 3902: 3897: 3892: 3887: 3885:Locally finite 3882: 3872: 3867: 3862: 3857: 3852: 3847: 3837: 3832: 3827: 3822: 3817: 3812: 3807: 3802: 3797: 3791: 3789: 3782: 3781: 3779: 3778: 3773: 3768: 3763: 3758: 3757: 3756: 3746: 3741: 3733: 3728: 3727: 3726: 3716: 3711: 3710: 3709: 3699: 3694: 3689: 3688: 3687: 3677: 3672: 3667: 3661: 3659: 3655: 3654: 3652: 3651: 3642: 3641: 3640: 3630: 3625: 3617: 3612: 3602: 3600: 3599:Basic concepts 3596: 3595: 3592:Measure theory 3588: 3587: 3580: 3573: 3565: 3559: 3558: 3552: 3539: 3533: 3520: 3514: 3499: 3496: 3493: 3492: 3429: 3376: 3330: 3285: 3278: 3264:. p. 28. 3247: 3246: 3244: 3241: 3240: 3239: 3233: 3227: 3221: 3213: 3210: 3202:Hugo Steinhaus 3185: 3180: 3177: 3173: 3122: 3102: 3099: 3096: 3093: 3090: 3087: 3084: 3081: 3078: 3059: 3056: 3036: 3033: 3000: 2997: 2994: 2991: 2971: 2968: 2965: 2945: 2942: 2939: 2919: 2916: 2913: 2910: 2907: 2904: 2901: 2898: 2880: 2877: 2864: 2844: 2839: 2836: 2832: 2828: 2825: 2805: 2785: 2782: 2779: 2774: 2771: 2767: 2761: 2758: 2754: 2750: 2747: 2744: 2741: 2738: 2735: 2711: 2708: 2705: 2702: 2682: 2662: 2659: 2656: 2653: 2633: 2613: 2610: 2607: 2604: 2599: 2596: 2592: 2588: 2585: 2565: 2562: 2559: 2556: 2553: 2550: 2530: 2527: 2524: 2521: 2497: 2494: 2491: 2488: 2468: 2465: 2462: 2459: 2456: 2453: 2450: 2447: 2444: 2441: 2438: 2435: 2426:, so consider 2411: 2408: 2405: 2402: 2382: 2377: 2373: 2369: 2366: 2346: 2341: 2337: 2316: 2311: 2307: 2303: 2300: 2280: 2277: 2274: 2271: 2268: 2265: 2245: 2242: 2239: 2236: 2233: 2230: 2210: 2207: 2204: 2201: 2198: 2195: 2175: 2170: 2166: 2141: 2118: 2098: 2078: 2058: 2055: 2040: 2037: 2007: 2003: 1981: 1961: 1941: 1921: 1905: 1902: 1901: 1900: 1889: 1886: 1882: 1878: 1874: 1871: 1867: 1862: 1858: 1854: 1850: 1847: 1844: 1840: 1836: 1832: 1828: 1824: 1821: 1818: 1815: 1812: 1809: 1790: 1787: 1784: 1781: 1778: 1775: 1772: 1769: 1766: 1763: 1760: 1757: 1754: 1749: 1745: 1722: 1717: 1712: 1709: 1681: 1678: 1675: 1672: 1669: 1666: 1641: 1636: 1613: 1592: 1581: 1580: 1570: 1559: 1554: 1549: 1527: 1522: 1517: 1495: 1469: 1464: 1451: 1439: 1435: 1415: 1404: 1400: 1370: 1358:countable sets 1354:singleton sets 1341: 1336: 1331: 1316:For instance: 1294: 1274: 1269: 1264: 1251: 1250: 1239: 1236: 1216: 1213: 1208: 1204: 1200: 1195: 1191: 1170: 1149: 1124: 1121: 1116: 1112: 1108: 1103: 1099: 1072: 1069: 1039: 1017: 996: 980:to subsets of 961: 958: 937: 910: 907: 904: 901: 898: 895: 892: 881: 880: 868: 853: 841: 819: 807: 783: 780: 777: 774: 771: 768: 741: 738: 735: 732: 729: 726: 723: 711: 708: 702:for which the 691: 656: 636: 632: 629: 626: 621: 617: 613: 610: 607: 602: 597: 594: 591: 587: 562: 558: 552: 547: 544: 541: 537: 533: 530: 508: 504: 500: 495: 491: 487: 484: 479: 475: 471: 468: 465: 444: 440: 437: 432: 428: 424: 419: 415: 411: 408: 403: 399: 374: 371: 366: 362: 358: 353: 349: 328: 325: 322: 319: 298: 274: 262: 259: 246: 243: 231: 228: 225: 222: 219: 216: 196: 193: 190: 170: 167: 164: 161: 158: 155: 152: 149: 146: 123:as defined in 68: 63: 26: 9: 6: 4: 3: 2: 4494: 4483: 4480: 4478: 4475: 4474: 4472: 4457: 4454: 4452: 4451:Real analysis 4449: 4447: 4444: 4442: 4439: 4437: 4434: 4433: 4431: 4427: 4417: 4414: 4412: 4409: 4407: 4404: 4400: 4397: 4396: 4395: 4392: 4390: 4387: 4386: 4384: 4381: 4375: 4369: 4366: 4364: 4361: 4359: 4356: 4354: 4351: 4347: 4344: 4343: 4342: 4339: 4338: 4335: 4332: 4330:Other results 4328: 4322: 4319: 4317: 4316:Radon–Nikodym 4314: 4312: 4309: 4307: 4304: 4300: 4297: 4296: 4295: 4292: 4290: 4289:Fatou's lemma 4287: 4285: 4282: 4278: 4275: 4273: 4270: 4268: 4265: 4264: 4262: 4258: 4255: 4253: 4250: 4248: 4245: 4244: 4242: 4240: 4237: 4236: 4234: 4232: 4228: 4222: 4219: 4217: 4214: 4212: 4209: 4207: 4204: 4202: 4199: 4197: 4194: 4192: 4188: 4186: 4183: 4179: 4176: 4174: 4171: 4170: 4169: 4166: 4164: 4161: 4159: 4156: 4154: 4151:Convergence: 4150: 4146: 4143: 4141: 4138: 4136: 4133: 4132: 4131: 4128: 4127: 4125: 4121: 4115: 4112: 4110: 4107: 4105: 4102: 4100: 4097: 4095: 4092: 4088: 4085: 4084: 4083: 4080: 4078: 4075: 4071: 4068: 4067: 4066: 4063: 4061: 4058: 4056: 4053: 4051: 4048: 4046: 4043: 4041: 4038: 4036: 4033: 4031: 4028: 4026: 4023: 4022: 4020: 4018: 4014: 4008: 4005: 4003: 4000: 3998: 3995: 3993: 3990: 3988: 3985: 3983: 3980: 3978: 3975: 3973: 3970: 3968: 3965: 3963: 3960: 3956: 3955:Outer regular 3953: 3951: 3950:Inner regular 3948: 3946: 3945:Borel regular 3943: 3942: 3941: 3938: 3936: 3933: 3931: 3928: 3926: 3923: 3921: 3917: 3913: 3911: 3908: 3906: 3903: 3901: 3898: 3896: 3893: 3891: 3888: 3886: 3883: 3881: 3877: 3873: 3871: 3868: 3866: 3863: 3861: 3858: 3856: 3853: 3851: 3848: 3846: 3842: 3838: 3836: 3833: 3831: 3828: 3826: 3823: 3821: 3818: 3816: 3813: 3811: 3808: 3806: 3803: 3801: 3798: 3796: 3793: 3792: 3790: 3788: 3783: 3777: 3774: 3772: 3769: 3767: 3764: 3762: 3759: 3755: 3752: 3751: 3750: 3747: 3745: 3742: 3740: 3734: 3732: 3729: 3725: 3722: 3721: 3720: 3717: 3715: 3712: 3708: 3705: 3704: 3703: 3700: 3698: 3695: 3693: 3690: 3686: 3683: 3682: 3681: 3678: 3676: 3673: 3671: 3668: 3666: 3663: 3662: 3660: 3656: 3650: 3646: 3643: 3639: 3636: 3635: 3634: 3633:Measure space 3631: 3629: 3626: 3624: 3622: 3618: 3616: 3613: 3611: 3607: 3604: 3603: 3601: 3597: 3593: 3586: 3581: 3579: 3574: 3572: 3567: 3566: 3563: 3555: 3549: 3545: 3540: 3536: 3530: 3526: 3521: 3517: 3511: 3507: 3502: 3501: 3488: 3484: 3480: 3476: 3472: 3468: 3464: 3460: 3455: 3450: 3447:(2): 377–44. 3446: 3442: 3441: 3433: 3425: 3421: 3417: 3413: 3409: 3405: 3400: 3395: 3391: 3387: 3380: 3372: 3368: 3363: 3358: 3354: 3350: 3349: 3341: 3334: 3326: 3322: 3318: 3314: 3310: 3306: 3303:(8): 718–21. 3302: 3298: 3297: 3289: 3281: 3275: 3271: 3267: 3263: 3259: 3252: 3248: 3237: 3234: 3231: 3228: 3225: 3222: 3219: 3216: 3215: 3209: 3207: 3203: 3199: 3183: 3178: 3175: 3171: 3162: 3154: 3153:Polish groups 3150: 3145: 3143: 3138: 3136: 3135:Haar null set 3120: 3100: 3097: 3094: 3088: 3085: 3082: 3076: 3057: 3054: 3034: 3031: 3023: 3022:Borel subsets 3018: 3014: 2998: 2995: 2992: 2989: 2969: 2966: 2963: 2943: 2940: 2937: 2917: 2908: 2902: 2899: 2889: 2886: 2876: 2862: 2855:) Therefore, 2842: 2837: 2834: 2830: 2826: 2823: 2803: 2780: 2772: 2769: 2759: 2756: 2752: 2745: 2739: 2733: 2725: 2706: 2700: 2680: 2660: 2657: 2654: 2651: 2631: 2611: 2605: 2597: 2594: 2590: 2586: 2583: 2560: 2554: 2551: 2548: 2525: 2519: 2511: 2510:homeomorphism 2492: 2486: 2466: 2463: 2460: 2454: 2448: 2445: 2439: 2433: 2425: 2406: 2400: 2375: 2371: 2364: 2344: 2339: 2335: 2309: 2305: 2298: 2278: 2275: 2269: 2263: 2243: 2240: 2234: 2228: 2208: 2202: 2199: 2196: 2173: 2168: 2164: 2155: 2139: 2130: 2116: 2096: 2076: 2056: 2053: 2046: 2036: 2034: 2033:Borel measure 2030: 2029: 2023: 2021: 2005: 2001: 1979: 1959: 1939: 1919: 1911: 1887: 1884: 1880: 1876: 1872: 1869: 1865: 1860: 1856: 1852: 1848: 1845: 1842: 1838: 1834: 1830: 1822: 1819: 1813: 1807: 1788: 1782: 1779: 1773: 1770: 1767: 1761: 1758: 1752: 1747: 1743: 1720: 1710: 1707: 1699: 1698: 1697: 1695: 1679: 1676: 1673: 1670: 1667: 1664: 1657: 1639: 1590: 1578: 1575:: the set of 1574: 1571: 1557: 1552: 1525: 1520: 1493: 1485: 1467: 1452: 1437: 1424: 1420: 1416: 1402: 1389: 1385: 1359: 1355: 1339: 1334: 1319: 1318: 1317: 1314: 1312: 1308: 1292: 1272: 1267: 1237: 1234: 1214: 1211: 1206: 1202: 1198: 1193: 1189: 1168: 1138: 1122: 1119: 1114: 1110: 1106: 1101: 1097: 1089: 1085: 1070: 1067: 1060: 1057: 1054: 1053: 1052: 994: 985: 983: 979: 975: 971: 967: 957: 955: 951: 928: 924: 905: 902: 896: 893: 866: 858: 854: 839: 831: 827: 824: 820: 805: 797: 781: 778: 766: 759: 758: 757: 755: 754:measure space 736: 733: 727: 724: 707: 705: 689: 681: 677: 673: 668: 654: 634: 630: 627: 619: 615: 608: 605: 595: 592: 589: 585: 560: 556: 545: 542: 539: 535: 531: 528: 506: 502: 498: 493: 489: 485: 477: 473: 466: 463: 438: 430: 426: 422: 417: 413: 406: 401: 397: 388: 372: 369: 364: 360: 356: 351: 347: 326: 323: 320: 317: 288: 272: 258: 256: 251: 242: 229: 226: 220: 214: 191: 188: 165: 162: 156: 153: 147: 144: 137: 136:measure space 132: 130: 126: 122: 117: 115: 111: 107: 103: 101: 96: 92: 88: 66: 51: 46: 40: 33: 19: 4231:Main results 3967:Set function 3895:Metric outer 3850:Decomposable 3760: 3707:Cylinder set 3620: 3543: 3524: 3505: 3444: 3438: 3432: 3389: 3385: 3379: 3352: 3346: 3333: 3300: 3294: 3288: 3257: 3251: 3146: 3142:Haar measure 3139: 3134: 3016: 2888:Banach space 2882: 2131: 2042: 2026: 2024: 1907: 1582: 1576: 1573:Sard's lemma 1315: 1252: 986: 963: 882: 857:monotonicity 713: 669: 264: 252: 248: 133: 118: 98: 90: 84: 18:Measure zero 4191:compact set 4158:of measures 4094:Pushforward 4087:Projections 4077:Logarithmic 3920:Probability 3910:Pre-measure 3692:Borel space 3610:of measures 2291:Obviously, 1654:, then the 756:. We have: 680:open covers 456:has length 4482:Set theory 4471:Categories 4163:in measure 3890:Maximising 3860:Equivalent 3754:Vitali set 3392:: 246–73. 3243:References 3161:meagre set 2045:Cantor set 1419:Cantor set 1161:such that 927:𝜎-algebra 796:definition 710:Properties 521:such that 261:Definition 255:Cantor set 207:such that 125:set theory 4277:Maharam's 4247:Dominated 4060:Intensity 4055:Hausdorff 3962:Saturated 3880:Invariant 3785:Types of 3744:σ-algebra 3714:𝜆-system 3680:Borel set 3675:Baire set 3487:119174196 3454:1006.2675 3394:CiteSeerX 3224:Empty set 3176:− 3159:is not a 3077:μ 2993:∈ 2941:⊆ 2912:‖ 2909:⋅ 2906:‖ 2885:separable 2879:Haar null 2835:− 2770:− 2757:− 2655:⊆ 2595:− 2552:⊆ 1849:λ 1831:λ 1827:⟺ 1808:π 1780:∈ 1711:⊂ 1677:π 1671:λ 1668:× 1665:λ 1591:λ 1484:dimension 1235:ε 1215:… 1137:intervals 1123:… 1068:ε 1056:Given any 987:A subset 936:Σ 906:μ 900:Σ 867:μ 840:μ 823:countable 806:μ 773:∅ 767:μ 737:μ 731:Σ 631:ε 609:⁡ 601:∞ 586:∑ 551:∞ 536:⋃ 532:⊆ 499:− 467:⁡ 439:⊆ 387:intervals 373:… 318:ε 287:real line 215:μ 195:Σ 192:∈ 166:μ 160:Σ 121:empty set 114:intervals 112:union of 110:countable 32:Empty set 4294:Fubini's 4284:Egorov's 4252:Monotone 4211:variable 4189:Random: 4140:Strongly 4065:Lebesgue 4050:Harmonic 4040:Gaussian 4025:Counting 3992:Spectral 3987:Singular 3977:s-finite 3972:σ-finite 3855:Discrete 3830:Complete 3787:Measures 3761:Null set 3649:function 3424:11511821 3212:See also 2982:for any 2724:preimage 2624:Because 2028:complete 1311:manifold 1088:sequence 1084:there is 923:𝜎-ideal 676:sequence 385:of open 265:Suppose 245:Examples 91:null set 39:Zero set 4206:process 4201:measure 4196:element 4135:Bochner 4109:Trivial 4104:Tangent 4082:Product 3940:Regular 3918:)  3905:Perfect 3878:)  3843:)  3835:Content 3825:Complex 3766:Support 3739:-system 3628:Measure 3479:4296513 3459:Bibcode 3416:2140632 3371:2162223 3325:1019152 3317:2324722 3236:Nothing 2673:and so 2152:be the 925:of the 921:form a 106:covered 100:measure 4272:Jordan 4257:Vitali 4216:vector 4145:Weakly 4007:Vector 3982:Signed 3935:Random 3876:Quasi- 3865:Finite 3845:Convex 3805:Banach 3795:Atomic 3623:spaces 3608:  3550:  3531:  3512:  3485:  3477:  3422:  3414:  3396:  3369:  3323:  3315:  3276:  2479:Since 2357:Hence 2020:spaces 1482:whose 1285:using 978:volume 970:length 606:length 582:  579:  569:  566:  464:length 4114:Young 4035:Euler 4030:Dirac 4002:Tight 3930:Radon 3900:Outer 3870:Inner 3820:Brown 3815:Borel 3810:Besov 3800:Baire 3483:S2CID 3449:arXiv 3420:S2CID 3367:JSTOR 3343:(PDF) 3313:JSTOR 3163:then 3133:is a 3113:then 2883:In a 2221:with 1388:dense 1307:cubes 826:union 752:be a 704:limit 647:then 108:by a 93:is a 4378:For 4267:Hahn 4123:Maps 4045:Haar 3916:Sub- 3670:Atom 3658:Sets 3548:ISBN 3529:ISBN 3510:ISBN 3274:ISBN 2256:and 1932:and 1904:Uses 1870:> 1735:and 1700:For 1352:all 974:area 964:The 821:Any 794:(by 714:Let 628:< 321:> 253:The 102:zero 89:, a 48:The 3467:doi 3404:doi 3357:doi 3353:125 3305:doi 3266:doi 3024:of 2089:of 1696:: 1583:If 1425:in 1390:in 1382:of 1139:in 1135:of 1007:of 976:or 956:". 859:of 832:of 798:of 682:of 678:of 574:and 85:In 4473:: 3481:. 3475:MR 3473:. 3465:. 3457:. 3445:41 3443:. 3418:. 3412:MR 3410:. 3402:. 3390:15 3388:. 3365:. 3351:. 3345:. 3321:MR 3319:. 3311:. 3301:96 3299:. 3272:. 3208:. 3144:. 3137:. 2279:1. 2035:. 1888:0. 1086:a 984:. 972:, 879:). 852:). 818:). 230:0. 3914:( 3874:( 3839:( 3737:π 3647:/ 3621:L 3584:e 3577:t 3570:v 3556:. 3537:. 3518:. 3489:. 3469:: 3461:: 3451:: 3426:. 3406:: 3373:. 3359:: 3327:. 3307:: 3282:. 3268:: 3184:A 3179:1 3172:A 3157:A 3121:A 3101:, 3098:0 3095:= 3092:) 3089:x 3086:+ 3083:A 3080:( 3058:, 3055:x 3035:, 3032:X 3017:ÎŒ 2999:. 2996:X 2990:x 2970:x 2967:+ 2964:A 2944:X 2938:A 2918:. 2915:) 2903:, 2900:X 2897:( 2863:F 2843:. 2838:1 2831:g 2827:= 2824:h 2804:F 2784:) 2781:F 2778:( 2773:1 2766:) 2760:1 2753:g 2749:( 2746:= 2743:) 2740:F 2737:( 2734:g 2710:) 2707:F 2704:( 2701:f 2681:F 2661:, 2658:K 2652:F 2632:g 2612:. 2609:) 2606:E 2603:( 2598:1 2591:g 2587:= 2584:F 2564:) 2561:K 2558:( 2555:g 2549:E 2529:) 2526:K 2523:( 2520:g 2496:) 2493:x 2490:( 2487:f 2467:. 2464:x 2461:+ 2458:) 2455:x 2452:( 2449:f 2446:= 2443:) 2440:x 2437:( 2434:g 2410:) 2407:K 2404:( 2401:f 2381:) 2376:c 2372:K 2368:( 2365:f 2345:. 2340:c 2336:K 2315:) 2310:c 2306:K 2302:( 2299:f 2276:= 2273:) 2270:1 2267:( 2264:f 2244:0 2241:= 2238:) 2235:0 2232:( 2229:f 2209:, 2206:] 2203:1 2200:, 2197:0 2194:[ 2174:, 2169:c 2165:K 2140:f 2117:F 2097:K 2077:F 2057:, 2054:K 2006:p 2002:L 1980:g 1960:f 1940:g 1920:f 1885:= 1881:) 1877:} 1873:0 1866:) 1861:x 1857:A 1853:( 1846:: 1843:x 1839:{ 1835:( 1823:0 1820:= 1817:) 1814:A 1811:( 1789:, 1786:} 1783:A 1777:) 1774:y 1771:, 1768:x 1765:( 1762:: 1759:y 1756:{ 1753:= 1748:x 1744:A 1721:2 1716:R 1708:A 1680:. 1674:= 1640:2 1635:R 1612:R 1558:. 1553:2 1548:R 1526:. 1521:n 1516:R 1494:n 1468:n 1463:R 1438:; 1434:R 1403:. 1399:R 1369:Q 1340:, 1335:n 1330:R 1305:- 1293:n 1273:, 1268:n 1263:R 1238:. 1212:, 1207:2 1203:I 1199:, 1194:1 1190:I 1169:N 1148:R 1120:, 1115:2 1111:I 1107:, 1102:1 1098:I 1071:, 1038:R 1016:R 995:N 909:) 903:, 897:, 894:X 891:( 782:0 779:= 776:) 770:( 740:) 734:, 728:, 725:X 722:( 690:A 655:A 635:, 625:) 620:n 616:U 612:( 596:1 593:= 590:n 561:n 557:U 546:1 543:= 540:n 529:A 507:n 503:a 494:n 490:b 486:= 483:) 478:n 474:U 470:( 443:R 436:) 431:n 427:b 423:, 418:n 414:a 410:( 407:= 402:n 398:U 370:, 365:2 361:U 357:, 352:1 348:U 327:, 324:0 297:R 273:A 227:= 224:) 221:S 218:( 189:S 169:) 163:, 157:, 154:X 151:( 148:= 145:M 81:. 67:2 62:R 41:. 34:. 20:)

Index

Measure zero
Empty set
Zero set

SierpiƄski triangle
mathematical analysis
Lebesgue measurable set
measure
covered
countable
intervals
empty set
set theory
Lebesgue measure
measure space
Cantor set
real line
intervals
mathematical analysis
sequence
open covers
limit
measure space
definition
countable
union
countable subadditivity
monotonicity
𝜎-ideal
𝜎-algebra

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