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Function space

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Kolmogorov, A. N., & Fomin, S. V. (1967). Elements of the theory of functions and functional analysis. Courier Dover Publications.
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Stein, Elias; Shakarchi, R. (2011). Functional Analysis: An Introduction to Further Topics in Analysis. Princeton University Press.
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of finite dimension. Here we use the real line as an example domain, but the spaces below exist on suitable open subsets
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addition and scalar multiplication. In other scenarios, the function space might inherit a
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which is inherited by the function space. For example, the set of functions from any set
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on the space of set theoretic functions (i.e. not necessarily continuous functions)
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in the above, and many of the major examples are function spaces carrying a
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is organized around adequate techniques to bring function spaces as
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of a function space with no extra structure can be found by the
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is essentially that of discrete invariants of function spaces;
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where the operations are defined pointwise, that is, for any
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that can model lambda calculus, by creating a well-behaved
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with addition and scalar multiplication defined pointwise.
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has additional structure, one might consider instead the
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Function spaces appear in various areas of mathematics:
1658: 1103:; but as (single) functor, of type , it appears as an 2699: 2258: 2190: 2156: 2094: 2057: 2013: 1948: 1920: 1876: 1843: 1799: 1753: 1614: 1576: 1534: 1483: 1441: 1397: 1357: 1322: 1279: 1243: 1206: 936: 909:
may be identified with the set of all functions from
651: 2452:. Springer Science & Business Media. p. 4. 1076:, the basic technical problem is how to construct a 3888: 3836: 3789: 3689: 3582: 3475: 3244: 3117: 3058: 2955: 2903: 2865: 2809: 2758: 2692: 2636: 2605: 2541: 116: 2712: 2364: 2215: 2175: 2119: 2065: 2039: 1965: 1933: 1895: 1860: 1825: 1774: 1737: 1632: 1600: 1558: 1512: 1465: 1421: 1381: 1339: 1303: 1260: 1227: 948: 773: 609:can be given the structure of a vector space over 1228:{\displaystyle \Omega \subseteq \mathbb {R} ^{n}} 112: 2279: 1429:continuous functions that have continuous first 232: 1152:, given two finite-dimensional representations 1137:, the basic idea is to find constructions from 960:! may be used for permutations of a single set 2040:{\displaystyle {\text{Lip}}_{0}(\mathbb {R} )} 1196:within reach of the ideas that would apply to 1099:. It appears in one way as the representation 3036: 2519: 1985:all functions, space of pointwise convergence 1826:{\displaystyle {\mathcal {S}}'(\mathbb {R} )} 1513:{\displaystyle C_{c}^{\infty }(\mathbb {R} )} 1389:continuous functions which vanish at infinity 434: 8: 3781:Riesz–Markov–Kakutani representation theorem 2266: 2259: 2164: 2157: 1775:{\displaystyle {\mathcal {S}}(\mathbb {R} )} 1666: 1659: 88: 1982:continuous functions, compact open topology 557:. Unsourced material may be challenged and 3876:Vitale's random Brunn–Minkowski inequality 3793: 3043: 3029: 3021: 2943:Vitale's random Brunn–Minkowski inequality 2900: 2526: 2512: 2504: 441: 427: 97: 29: 2704: 2698: 2341: 2340: 2323: 2317: 2300: 2282: 2269: 2257: 2192: 2191: 2189: 2167: 2155: 2096: 2095: 2093: 2059: 2058: 2056: 2030: 2029: 2020: 2015: 2012: 1957: 1951: 1950: 1947: 1925: 1919: 1881: 1875: 1851: 1850: 1842: 1816: 1815: 1802: 1801: 1798: 1765: 1764: 1755: 1754: 1752: 1725: 1721: 1710: 1705: 1696: 1690: 1689: 1688: 1669: 1657: 1613: 1591: 1590: 1581: 1575: 1559:{\displaystyle C^{\omega }(\mathbb {R} )} 1549: 1548: 1539: 1533: 1503: 1502: 1493: 1488: 1482: 1466:{\displaystyle C^{\infty }(\mathbb {R} )} 1456: 1455: 1446: 1440: 1412: 1411: 1402: 1396: 1372: 1371: 1362: 1356: 1330: 1329: 1321: 1294: 1293: 1284: 1278: 1251: 1250: 1242: 1219: 1215: 1214: 1205: 1168:over the vector space of linear maps Hom( 1012:. It consists of the set of all possible 935: 820:with pointwise operations (often denoted 652: 650: 577:Learn how and when to remove this message 2438: 415: 362: 329: 249: 217: 208: 64: 57: 32: 27:Set of functions between two fixed sets 1271:endowed with the uniform norm topology 1150:representation theory of finite groups 2480:(2000). Silverman, Richard A. (ed.). 2449:Representation Theory: A First Course 2446:Fulton, William; Harris, Joe (1991). 236: 221: 202: 191: 176: 157: 146: 127: 101: 82: 7: 3889:Applications & related 2956:Applications & related 2088:is an element of the function space 998:, the set of all functions from the 555:adding citations to reliable sources 172: 163: 2875:Marcinkiewicz interpolation theorem 2216:{\displaystyle {\mathcal {C}}(a,b)} 2120:{\displaystyle {\mathcal {C}}(a,b)} 1633:{\displaystyle 1\leq p\leq \infty } 1601:{\displaystyle L^{p}(\mathbb {R} )} 1422:{\displaystyle C^{r}(\mathbb {R} )} 1382:{\displaystyle C_{0}(\mathbb {R} )} 1304:{\displaystyle C_{c}(\mathbb {R} )} 1164:, one can form a representation of 519:Vector space § Function spaces 505:structure, hence the name function 469:between two fixed sets. Often, the 2801:Symmetric decreasing rearrangement 2705: 2270: 2168: 1966:{\displaystyle {\mathcal {O}}_{U}} 1627: 1494: 1447: 1207: 1091:, the function space is called an 983:; the best known examples include 975:linear transformations, including 949:{\displaystyle X\leftrightarrow Y} 25: 1868:compact support in limit topology 1056:topology of pointwise convergence 3818:Lebesgue differentiation theorem 3699:CarathĂ©odory's extension theorem 1126:are used to express the idea of 527: 493:vector space structure given by 142: 133: 2322: 2176:{\displaystyle \|y\|_{\infty }} 1861:{\displaystyle D(\mathbb {R} )} 1340:{\displaystyle B(\mathbb {R} )} 1261:{\displaystyle C(\mathbb {R} )} 977:topologies on the vector spaces 59:History of the function concept 2407:List of mathematical functions 2359: 2347: 2318: 2314: 2308: 2301: 2210: 2198: 2114: 2102: 2034: 2026: 1855: 1847: 1820: 1812: 1769: 1761: 1706: 1697: 1595: 1587: 1553: 1545: 1507: 1499: 1460: 1452: 1416: 1408: 1376: 1368: 1334: 1326: 1298: 1290: 1255: 1247: 940: 801:itself are vector spaces over 764: 758: 739: 733: 730: 718: 711: 705: 696: 690: 677: 671: 668: 656: 1: 2771:Convergence almost everywhere 2001:functions, also known as the 1107:to a functor of type (-× 2066:{\displaystyle \mathbb {R} } 878:, the set of functions from 3942:Topology of function spaces 3871:PrĂ©kopa–Leindler inequality 2938:PrĂ©kopa–Leindler inequality 2791:Locally integrable function 2713:{\displaystyle L^{\infty }} 3963: 3813:Lebesgue's density theorem 2684:Square-integrable function 1979:piecewise linear functions 1311:continuous functions with 956:. The factorial notation 832:)). One such space is the 601:be any set. The functions 516: 417:List of specific functions 3866:Minkowski–Steiner formula 3796: 3681:Projection-valued measure 2933:Minkowski–Steiner formula 1793:and its continuous dual, 1194:topological vector spaces 1143:Cartesian closed category 1046:. Also available is the 816:form a vector space over 3849:Isoperimetric inequality 3828:Vitali–Hahn–Saks theorem 3157:CarathĂ©odory's criterion 2916:Isoperimetric inequality 3854:Brunn–Minkowski theorem 3723:Decomposition theorems 2921:Brunn–Minkowski theorem 1896:{\displaystyle W^{k,p}} 1567:real analytic functions 1080:on a function space of 971:, the same is seen for 901:As a special case, the 860:ErdƑs–Kaplansky theorem 3901:Descriptive set theory 3801:Disintegration theorem 3236:Universally measurable 2776:Convergence in measure 2714: 2483:Calculus of variations 2427:Functional determinant 2366: 2217: 2177: 2131:that are defined on a 2121: 2067: 2041: 1967: 1935: 1897: 1862: 1834:tempered distributions 1827: 1776: 1739: 1634: 1602: 1560: 1514: 1467: 1423: 1383: 1341: 1305: 1262: 1229: 1128:higher-order functions 1116:functional programming 950: 775: 3703:Convergence theorems 3162:Cylindrical σ-algebra 2890:Riesz–Fischer theorem 2715: 2674:Polarization identity 2367: 2218: 2178: 2122: 2068: 2042: 1973:holomorphic functions 1968: 1936: 1934:{\displaystyle L^{p}} 1898: 1863: 1828: 1777: 1740: 1635: 1603: 1561: 1515: 1468: 1424: 1384: 1342: 1306: 1263: 1230: 1040:compact-open topology 951: 913:to {0, 1}, denoted 2. 776: 477:will have additional 3771:Minkowski inequality 3645:Cylinder set measure 3530:Infinite-dimensional 3145:equivalence relation 3075:Lebesgue integration 2895:Riesz–Thorin theorem 2738:Infimum and supremum 2697: 2623:Lebesgue integration 2256: 2188: 2154: 2129:continuous functions 2092: 2073:that vanish at zero. 2055: 2011: 1946: 1918: 1874: 1841: 1797: 1751: 1656: 1612: 1574: 1532: 1481: 1439: 1395: 1355: 1320: 1277: 1269:continuous functions 1241: 1204: 1084:(functions of time); 1082:paths of the process 1074:stochastic processes 934: 649: 551:improve this section 3766:Hölder's inequality 3628:of random variables 3590:Measurable function 3477:Particular measures 3066:Absolute continuity 2857:Young's convolution 2796:Measurable function 2679:Pythagorean theorem 2669:Parseval's identity 2618:Integrable function 2047:, the space of all 1906:of functions whose 1498: 1190:Functional analysis 1185:Functional analysis 1101:canonical bifunctor 1078:probability measure 996:functional analysis 969:functional analysis 3906:Probability theory 3231:Transverse measure 3209:Non-measurable set 3191:Locally measurable 2978:Probability theory 2880:Plancherel theorem 2786:Integral transform 2733:Chebyshev distance 2710: 2659:Euclidean distance 2592:Minkowski distance 2362: 2299: 2213: 2173: 2117: 2063: 2037: 1963: 1931: 1893: 1858: 1823: 1788:rapidly decreasing 1772: 1735: 1630: 1598: 1556: 1510: 1484: 1463: 1419: 1379: 1337: 1301: 1258: 1225: 1178:Hom representation 1093:exponential object 1063:algebraic topology 946: 842:linear functionals 771: 769: 251:Classes/properties 3924: 3923: 3884: 3883: 3613:almost everywhere 3559:Spherical measure 3457:Strictly positive 3385:Projection-valued 3125:Almost everywhere 3098:Probability space 3018: 3017: 2951: 2950: 2766:Almost everywhere 2551: &  2333: 2330: 2326: 2278: 2018: 1348:bounded functions 1072:In the theory of 1029:topological space 587: 586: 579: 513:In linear algebra 451: 450: 363:Generalizations 16:(Redirected from 3954: 3859:Milman's reverse 3842: 3840:Lebesgue measure 3794: 3198: 3184:infimum/supremum 3105:Measurable space 3045: 3038: 3031: 3022: 2968:Fourier analysis 2926:Milman's reverse 2909: 2907:Lebesgue measure 2901: 2885:Riemann–Lebesgue 2728:Bounded function 2719: 2717: 2716: 2711: 2709: 2708: 2628:Taxicab geometry 2583:Measurable space 2528: 2521: 2514: 2505: 2498: 2497: 2470: 2464: 2463: 2443: 2412:Clifford algebra 2371: 2369: 2368: 2363: 2346: 2345: 2331: 2328: 2327: 2324: 2321: 2304: 2298: 2274: 2273: 2251: 2237: 2222: 2220: 2219: 2214: 2197: 2196: 2182: 2180: 2179: 2174: 2172: 2171: 2145: 2126: 2124: 2123: 2118: 2101: 2100: 2087: 2072: 2070: 2069: 2064: 2062: 2046: 2044: 2043: 2038: 2033: 2025: 2024: 2019: 2016: 1976:linear functions 1972: 1970: 1969: 1964: 1962: 1961: 1956: 1955: 1940: 1938: 1937: 1932: 1930: 1929: 1908:weak derivatives 1902: 1900: 1899: 1894: 1892: 1891: 1867: 1865: 1864: 1859: 1854: 1832: 1830: 1829: 1824: 1819: 1811: 1807: 1806: 1791:smooth functions 1781: 1779: 1778: 1773: 1768: 1760: 1759: 1744: 1742: 1741: 1736: 1734: 1733: 1729: 1720: 1716: 1715: 1714: 1709: 1700: 1695: 1694: 1693: 1674: 1673: 1648:functions whose 1639: 1637: 1636: 1631: 1607: 1605: 1604: 1599: 1594: 1586: 1585: 1565: 1563: 1562: 1557: 1552: 1544: 1543: 1521:smooth functions 1519: 1517: 1516: 1511: 1506: 1497: 1492: 1474:smooth functions 1472: 1470: 1469: 1464: 1459: 1451: 1450: 1428: 1426: 1425: 1420: 1415: 1407: 1406: 1388: 1386: 1385: 1380: 1375: 1367: 1366: 1346: 1344: 1343: 1338: 1333: 1310: 1308: 1307: 1302: 1297: 1289: 1288: 1267: 1265: 1264: 1259: 1254: 1234: 1232: 1231: 1226: 1224: 1223: 1218: 1048:product topology 955: 953: 952: 947: 886:may be denoted { 781:When the domain 780: 778: 777: 772: 770: 582: 575: 571: 568: 562: 531: 523: 443: 436: 429: 241: 240: 234: 226: 225: 219: 211: 210: 206: 196: 195: 189: 181: 180: 174: 166: 165: 161: 151: 150: 144: 136: 135: 131: 121: 120: 114: 106: 105: 99: 91: 90: 86: 53: 30: 21: 18:Functional space 3962: 3961: 3957: 3956: 3955: 3953: 3952: 3951: 3937:Function spaces 3927: 3926: 3925: 3920: 3916:Spectral theory 3896:Convex analysis 3880: 3837: 3832: 3785: 3685: 3633:in distribution 3578: 3471: 3301:Logarithmically 3240: 3196: 3179:Essential range 3113: 3054: 3049: 3019: 3014: 2947: 2904: 2899: 2861: 2837:Hausdorff–Young 2817:Babenko–Beckner 2805: 2754: 2700: 2695: 2694: 2688: 2632: 2601: 2597:Sequence spaces 2537: 2532: 2502: 2501: 2494: 2472: 2471: 2467: 2460: 2445: 2444: 2440: 2435: 2422:Spectral theory 2403: 2390: 2265: 2254: 2253: 2239: 2228: 2223:is the maximum 2186: 2185: 2163: 2152: 2151: 2135: 2133:closed interval 2090: 2089: 2083: 2080: 2053: 2052: 2014: 2009: 2008: 1949: 1944: 1943: 1921: 1916: 1915: 1877: 1872: 1871: 1839: 1838: 1800: 1795: 1794: 1749: 1748: 1704: 1684: 1683: 1679: 1678: 1665: 1654: 1653: 1610: 1609: 1577: 1572: 1571: 1535: 1530: 1529: 1525:compact support 1479: 1478: 1442: 1437: 1436: 1398: 1393: 1392: 1358: 1353: 1352: 1318: 1317: 1313:compact support 1280: 1275: 1274: 1239: 1238: 1213: 1202: 1201: 1187: 1175: 1171: 1167: 1163: 1159: 1155: 1120:lambda calculus 1105:adjoint functor 1089:category theory 1067:homotopy theory 1065:, the study of 1034:to another one 1016:of elements of 1000:natural numbers 932: 931: 868: 850: 846: 839: 831: 827: 819: 815: 811: 804: 800: 796: 784: 768: 767: 742: 715: 714: 680: 647: 646: 644: 640: 636: 632: 628: 624: 620: 616: 612: 608: 604: 600: 592: 583: 572: 566: 563: 548: 532: 521: 515: 484: 447: 411: 372:Binary relation 358: 325: 245: 239: 231: 224: 216: 205: 201: 194: 186: 179: 171: 160: 156: 149: 141: 130: 126: 119: 111: 104: 96: 85: 81: 40: 28: 23: 22: 15: 12: 11: 5: 3960: 3958: 3950: 3949: 3947:Linear algebra 3944: 3939: 3929: 3928: 3922: 3921: 3919: 3918: 3913: 3908: 3903: 3898: 3892: 3890: 3886: 3885: 3882: 3881: 3879: 3878: 3873: 3868: 3863: 3862: 3861: 3851: 3845: 3843: 3834: 3833: 3831: 3830: 3825: 3823:Sard's theorem 3820: 3815: 3810: 3809: 3808: 3806:Lifting theory 3797: 3791: 3787: 3786: 3784: 3783: 3778: 3773: 3768: 3763: 3762: 3761: 3759:Fubini–Tonelli 3751: 3746: 3741: 3740: 3739: 3734: 3729: 3721: 3720: 3719: 3714: 3709: 3701: 3695: 3693: 3687: 3686: 3684: 3683: 3678: 3673: 3668: 3663: 3658: 3653: 3647: 3642: 3641: 3640: 3638:in probability 3635: 3625: 3620: 3615: 3609: 3608: 3607: 3602: 3597: 3586: 3584: 3580: 3579: 3577: 3576: 3571: 3566: 3561: 3556: 3551: 3550: 3549: 3539: 3534: 3533: 3532: 3522: 3517: 3512: 3507: 3502: 3497: 3492: 3487: 3481: 3479: 3473: 3472: 3470: 3469: 3464: 3459: 3454: 3449: 3444: 3439: 3434: 3429: 3424: 3419: 3418: 3417: 3412: 3407: 3397: 3392: 3387: 3382: 3372: 3367: 3362: 3357: 3352: 3347: 3345:Locally finite 3342: 3332: 3327: 3322: 3317: 3312: 3307: 3297: 3292: 3287: 3282: 3277: 3272: 3267: 3262: 3257: 3251: 3249: 3242: 3241: 3239: 3238: 3233: 3228: 3223: 3218: 3217: 3216: 3206: 3201: 3193: 3188: 3187: 3186: 3176: 3171: 3170: 3169: 3159: 3154: 3149: 3148: 3147: 3137: 3132: 3127: 3121: 3119: 3115: 3114: 3112: 3111: 3102: 3101: 3100: 3090: 3085: 3077: 3072: 3062: 3060: 3059:Basic concepts 3056: 3055: 3052:Measure theory 3050: 3048: 3047: 3040: 3033: 3025: 3016: 3015: 3013: 3012: 3011: 3010: 3005: 2995: 2990: 2985: 2980: 2975: 2970: 2965: 2959: 2957: 2953: 2952: 2949: 2948: 2946: 2945: 2940: 2935: 2930: 2929: 2928: 2918: 2912: 2910: 2898: 2897: 2892: 2887: 2882: 2877: 2871: 2869: 2863: 2862: 2860: 2859: 2854: 2849: 2844: 2839: 2834: 2829: 2824: 2819: 2813: 2811: 2807: 2806: 2804: 2803: 2798: 2793: 2788: 2783: 2781:Function space 2778: 2773: 2768: 2762: 2760: 2756: 2755: 2753: 2752: 2747: 2746: 2745: 2735: 2730: 2724: 2722: 2707: 2703: 2690: 2689: 2687: 2686: 2681: 2676: 2671: 2666: 2661: 2656: 2654:Cauchy–Schwarz 2651: 2645: 2643: 2634: 2633: 2631: 2630: 2625: 2620: 2614: 2612: 2603: 2602: 2600: 2599: 2594: 2589: 2580: 2575: 2574: 2573: 2563: 2555: 2553:Hilbert spaces 2545: 2543: 2542:Basic concepts 2539: 2538: 2533: 2531: 2530: 2523: 2516: 2508: 2500: 2499: 2493:978-0486414485 2492: 2474:Gelfand, I. M. 2465: 2458: 2437: 2436: 2434: 2431: 2430: 2429: 2424: 2419: 2414: 2409: 2402: 2399: 2398: 2397: 2394: 2389: 2386: 2384:('sup norm'). 2374:is called the 2361: 2358: 2355: 2352: 2349: 2344: 2339: 2336: 2320: 2316: 2313: 2310: 2307: 2303: 2297: 2294: 2291: 2288: 2285: 2281: 2277: 2272: 2268: 2264: 2261: 2225:absolute value 2212: 2209: 2206: 2203: 2200: 2195: 2170: 2166: 2162: 2159: 2116: 2113: 2110: 2107: 2104: 2099: 2079: 2076: 2075: 2074: 2061: 2036: 2032: 2028: 2023: 2006: 1996: 1991: 1986: 1983: 1980: 1977: 1974: 1960: 1954: 1941: 1928: 1924: 1890: 1887: 1884: 1880: 1869: 1857: 1853: 1849: 1846: 1836: 1822: 1818: 1814: 1810: 1805: 1784:Schwartz space 1771: 1767: 1763: 1758: 1746: 1732: 1728: 1724: 1719: 1713: 1708: 1703: 1699: 1692: 1687: 1682: 1677: 1672: 1668: 1664: 1661: 1629: 1626: 1623: 1620: 1617: 1597: 1593: 1589: 1584: 1580: 1569: 1555: 1551: 1547: 1542: 1538: 1527: 1509: 1505: 1501: 1496: 1491: 1487: 1476: 1462: 1458: 1454: 1449: 1445: 1434: 1418: 1414: 1410: 1405: 1401: 1390: 1378: 1374: 1370: 1365: 1361: 1350: 1336: 1332: 1328: 1325: 1315: 1300: 1296: 1292: 1287: 1283: 1272: 1257: 1253: 1249: 1246: 1222: 1217: 1212: 1209: 1186: 1183: 1182: 1181: 1173: 1169: 1165: 1161: 1157: 1153: 1146: 1139:partial orders 1131: 1124:function types 1112: 1085: 1070: 1059: 1021: 1009:sequence space 992: 985:Hilbert spaces 965: 945: 942: 939: 916: 915: 914: 867: 864: 848: 844: 837: 829: 825: 817: 813: 809: 802: 798: 794: 782: 766: 763: 760: 757: 754: 751: 748: 745: 743: 741: 738: 735: 732: 729: 726: 723: 720: 717: 716: 713: 710: 707: 704: 701: 698: 695: 692: 689: 686: 683: 681: 679: 676: 673: 670: 667: 664: 661: 658: 655: 654: 642: 638: 634: 630: 626: 622: 618: 614: 610: 606: 602: 598: 590: 585: 584: 535: 533: 526: 514: 511: 482: 459:function space 449: 448: 446: 445: 438: 431: 423: 420: 419: 413: 412: 410: 409: 404: 399: 394: 389: 384: 379: 374: 368: 365: 364: 360: 359: 357: 356: 351: 346: 341: 335: 332: 331: 327: 326: 324: 323: 318: 313: 308: 303: 298: 293: 288: 283: 278: 273: 268: 263: 257: 254: 253: 247: 246: 244: 243: 237: 228: 222: 213: 203: 198: 192: 183: 177: 168: 158: 153: 147: 138: 128: 123: 117: 108: 102: 93: 83: 77: 74: 73: 62: 61: 55: 54: 37: 36: 26: 24: 14: 13: 10: 9: 6: 4: 3: 2: 3959: 3948: 3945: 3943: 3940: 3938: 3935: 3934: 3932: 3917: 3914: 3912: 3911:Real analysis 3909: 3907: 3904: 3902: 3899: 3897: 3894: 3893: 3891: 3887: 3877: 3874: 3872: 3869: 3867: 3864: 3860: 3857: 3856: 3855: 3852: 3850: 3847: 3846: 3844: 3841: 3835: 3829: 3826: 3824: 3821: 3819: 3816: 3814: 3811: 3807: 3804: 3803: 3802: 3799: 3798: 3795: 3792: 3790:Other results 3788: 3782: 3779: 3777: 3776:Radon–Nikodym 3774: 3772: 3769: 3767: 3764: 3760: 3757: 3756: 3755: 3752: 3750: 3749:Fatou's lemma 3747: 3745: 3742: 3738: 3735: 3733: 3730: 3728: 3725: 3724: 3722: 3718: 3715: 3713: 3710: 3708: 3705: 3704: 3702: 3700: 3697: 3696: 3694: 3692: 3688: 3682: 3679: 3677: 3674: 3672: 3669: 3667: 3664: 3662: 3659: 3657: 3654: 3652: 3648: 3646: 3643: 3639: 3636: 3634: 3631: 3630: 3629: 3626: 3624: 3621: 3619: 3616: 3614: 3611:Convergence: 3610: 3606: 3603: 3601: 3598: 3596: 3593: 3592: 3591: 3588: 3587: 3585: 3581: 3575: 3572: 3570: 3567: 3565: 3562: 3560: 3557: 3555: 3552: 3548: 3545: 3544: 3543: 3540: 3538: 3535: 3531: 3528: 3527: 3526: 3523: 3521: 3518: 3516: 3513: 3511: 3508: 3506: 3503: 3501: 3498: 3496: 3493: 3491: 3488: 3486: 3483: 3482: 3480: 3478: 3474: 3468: 3465: 3463: 3460: 3458: 3455: 3453: 3450: 3448: 3445: 3443: 3440: 3438: 3435: 3433: 3430: 3428: 3425: 3423: 3420: 3416: 3415:Outer regular 3413: 3411: 3410:Inner regular 3408: 3406: 3405:Borel regular 3403: 3402: 3401: 3398: 3396: 3393: 3391: 3388: 3386: 3383: 3381: 3377: 3373: 3371: 3368: 3366: 3363: 3361: 3358: 3356: 3353: 3351: 3348: 3346: 3343: 3341: 3337: 3333: 3331: 3328: 3326: 3323: 3321: 3318: 3316: 3313: 3311: 3308: 3306: 3302: 3298: 3296: 3293: 3291: 3288: 3286: 3283: 3281: 3278: 3276: 3273: 3271: 3268: 3266: 3263: 3261: 3258: 3256: 3253: 3252: 3250: 3248: 3243: 3237: 3234: 3232: 3229: 3227: 3224: 3222: 3219: 3215: 3212: 3211: 3210: 3207: 3205: 3202: 3200: 3194: 3192: 3189: 3185: 3182: 3181: 3180: 3177: 3175: 3172: 3168: 3165: 3164: 3163: 3160: 3158: 3155: 3153: 3150: 3146: 3143: 3142: 3141: 3138: 3136: 3133: 3131: 3128: 3126: 3123: 3122: 3120: 3116: 3110: 3106: 3103: 3099: 3096: 3095: 3094: 3093:Measure space 3091: 3089: 3086: 3084: 3082: 3078: 3076: 3073: 3071: 3067: 3064: 3063: 3061: 3057: 3053: 3046: 3041: 3039: 3034: 3032: 3027: 3026: 3023: 3009: 3006: 3004: 3001: 3000: 2999: 2996: 2994: 2993:Sobolev space 2991: 2989: 2988:Real analysis 2986: 2984: 2981: 2979: 2976: 2974: 2973:Lorentz space 2971: 2969: 2966: 2964: 2963:Bochner space 2961: 2960: 2958: 2954: 2944: 2941: 2939: 2936: 2934: 2931: 2927: 2924: 2923: 2922: 2919: 2917: 2914: 2913: 2911: 2908: 2902: 2896: 2893: 2891: 2888: 2886: 2883: 2881: 2878: 2876: 2873: 2872: 2870: 2868: 2864: 2858: 2855: 2853: 2850: 2848: 2845: 2843: 2840: 2838: 2835: 2833: 2830: 2828: 2825: 2823: 2820: 2818: 2815: 2814: 2812: 2808: 2802: 2799: 2797: 2794: 2792: 2789: 2787: 2784: 2782: 2779: 2777: 2774: 2772: 2769: 2767: 2764: 2763: 2761: 2757: 2751: 2748: 2744: 2741: 2740: 2739: 2736: 2734: 2731: 2729: 2726: 2725: 2723: 2721: 2701: 2691: 2685: 2682: 2680: 2677: 2675: 2672: 2670: 2667: 2665: 2664:Hilbert space 2662: 2660: 2657: 2655: 2652: 2650: 2647: 2646: 2644: 2642: 2640: 2635: 2629: 2626: 2624: 2621: 2619: 2616: 2615: 2613: 2611: 2609: 2604: 2598: 2595: 2593: 2590: 2588: 2584: 2581: 2579: 2578:Measure space 2576: 2572: 2569: 2568: 2567: 2564: 2562: 2560: 2556: 2554: 2550: 2547: 2546: 2544: 2540: 2536: 2529: 2524: 2522: 2517: 2515: 2510: 2509: 2506: 2495: 2489: 2485: 2484: 2479: 2475: 2469: 2466: 2461: 2459:9780387974958 2455: 2451: 2450: 2442: 2439: 2432: 2428: 2425: 2423: 2420: 2418: 2415: 2413: 2410: 2408: 2405: 2404: 2400: 2395: 2392: 2391: 2387: 2385: 2383: 2382:supremum norm 2379: 2378: 2372: 2356: 2353: 2350: 2337: 2334: 2311: 2305: 2295: 2292: 2289: 2286: 2283: 2275: 2262: 2250: 2246: 2242: 2235: 2231: 2226: 2207: 2204: 2201: 2183: 2160: 2150: 2143: 2139: 2134: 2130: 2111: 2108: 2105: 2086: 2077: 2051:functions on 2050: 2021: 2007: 2004: 2000: 1997: 1995: 1992: 1990: 1987: 1984: 1981: 1978: 1975: 1958: 1942: 1926: 1922: 1913: 1909: 1905: 1904:Sobolev space 1888: 1885: 1882: 1878: 1870: 1844: 1837: 1835: 1808: 1792: 1789: 1785: 1747: 1730: 1726: 1722: 1717: 1711: 1701: 1685: 1680: 1675: 1670: 1662: 1651: 1647: 1643: 1624: 1621: 1618: 1615: 1582: 1578: 1570: 1568: 1540: 1536: 1528: 1526: 1522: 1489: 1485: 1477: 1475: 1443: 1435: 1432: 1403: 1399: 1391: 1363: 1359: 1351: 1349: 1323: 1316: 1314: 1285: 1281: 1273: 1270: 1244: 1237: 1236: 1235: 1220: 1210: 1199: 1198:normed spaces 1195: 1191: 1184: 1179: 1176:) called the 1151: 1147: 1144: 1140: 1136: 1135:domain theory 1132: 1129: 1125: 1121: 1117: 1113: 1111:) on objects; 1110: 1106: 1102: 1098: 1094: 1090: 1086: 1083: 1079: 1075: 1071: 1068: 1064: 1060: 1057: 1053: 1049: 1045: 1041: 1037: 1033: 1030: 1026: 1022: 1019: 1015: 1011: 1010: 1005: 1001: 997: 993: 990: 989:Banach spaces 986: 982: 978: 974: 970: 966: 963: 959: 943: 937: 929: 925: 921: 917: 912: 908: 904: 900: 899: 897: 893: 889: 885: 881: 877: 873: 872: 871: 865: 863: 861: 857: 854:The cardinal 852: 843: 840:: the set of 835: 823: 808: 805:, the set of 792: 788: 761: 755: 752: 749: 746: 744: 736: 727: 724: 721: 708: 702: 699: 693: 687: 684: 682: 674: 665: 662: 659: 596: 581: 578: 570: 567:November 2017 560: 556: 552: 546: 545: 541: 536:This section 534: 530: 525: 524: 520: 512: 510: 508: 504: 500: 496: 492: 488: 480: 476: 472: 468: 464: 460: 456: 444: 439: 437: 432: 430: 425: 424: 422: 421: 418: 414: 408: 405: 403: 400: 398: 395: 393: 390: 388: 385: 383: 380: 378: 375: 373: 370: 369: 367: 366: 361: 355: 352: 350: 347: 345: 342: 340: 337: 336: 334: 333: 330:Constructions 328: 322: 319: 317: 314: 312: 309: 307: 304: 302: 299: 297: 294: 292: 289: 287: 284: 282: 279: 277: 274: 272: 269: 267: 264: 262: 259: 258: 256: 255: 252: 248: 242: 229: 227: 214: 212: 199: 197: 184: 182: 169: 167: 154: 152: 139: 137: 124: 122: 109: 107: 94: 92: 79: 78: 76: 75: 72: 68: 63: 60: 56: 51: 47: 43: 39: 38: 35: 31: 19: 3691:Main results 3427:Set function 3355:Metric outer 3310:Decomposable 3167:Cylinder set 3080: 2810:Inequalities 2780: 2750:Uniform norm 2638: 2607: 2558: 2482: 2478:Fomin, S. V. 2468: 2448: 2441: 2417:Tensor field 2388:Bibliography 2381: 2377:uniform norm 2375: 2373: 2248: 2244: 2240: 2233: 2229: 2147: 2141: 2137: 2084: 2081: 1994:Hölder space 1911: 1910:up to order 1649: 1433:derivatives. 1430: 1188: 1108: 1081: 1051: 1035: 1031: 1017: 1007: 1006:is called a 1003: 1002:to some set 961: 957: 927: 923: 910: 906: 895: 891: 887: 883: 879: 869: 853: 588: 573: 564: 549:Please help 537: 506: 487:vector space 458: 452: 397:Higher-order 391: 49: 45: 41: 3651:compact set 3618:of measures 3554:Pushforward 3547:Projections 3537:Logarithmic 3380:Probability 3370:Pre-measure 3152:Borel space 3070:of measures 3008:Von Neumann 2822:Chebyshev's 2184:defined on 1989:Hardy space 1160:of a group 930:is denoted 918:The set of 807:linear maps 499:topological 455:mathematics 382:Multivalued 344:Composition 339:Restriction 3931:Categories 3623:in measure 3350:Maximising 3320:Equivalent 3214:Vitali set 3003:C*-algebra 2827:Clarkson's 2433:References 1646:measurable 1097:map object 1044:loop space 973:continuous 920:bijections 876:set theory 834:dual space 637:, and any 517:See also: 316:Surjective 306:Measurable 301:Continuous 276:Polynomial 3737:Maharam's 3707:Dominated 3520:Intensity 3515:Hausdorff 3422:Saturated 3340:Invariant 3245:Types of 3204:σ-algebra 3174:𝜆-system 3140:Borel set 3135:Baire set 2998:*-algebra 2983:Quasinorm 2852:Minkowski 2743:Essential 2706:∞ 2535:Lp spaces 2338:∈ 2293:≤ 2287:≤ 2276:≡ 2271:∞ 2267:‖ 2260:‖ 2169:∞ 2165:‖ 2158:‖ 2049:Lipschitz 2003:Skorokhod 1745:is finite 1686:∫ 1667:‖ 1660:‖ 1640:, is the 1628:∞ 1625:≤ 1619:≤ 1541:ω 1495:∞ 1448:∞ 1211:⊆ 1208:Ω 1014:sequences 941:↔ 905:of a set 903:power set 856:dimension 797:and also 753:⋅ 725:⋅ 645:, define 538:does not 495:pointwise 479:structure 467:functions 321:Bijective 311:Injective 286:Algebraic 65:Types by 3754:Fubini's 3744:Egorov's 3712:Monotone 3671:variable 3649:Random: 3600:Strongly 3525:Lebesgue 3510:Harmonic 3500:Gaussian 3485:Counting 3452:Spectral 3447:Singular 3437:s-finite 3432:σ-finite 3315:Discrete 3290:Complete 3247:Measures 3221:Null set 3109:function 2847:Markov's 2842:Hölder's 2832:Hanner's 2649:Bessel's 2587:function 2571:Lebesgue 2401:See also 1809:′ 1025:topology 981:topology 866:Examples 791:subspace 621: : 597:and let 475:codomain 402:Morphism 387:Implicit 291:Analytic 281:Rational 266:Identity 261:Constant 71:codomain 48: ( 34:Function 3666:process 3661:measure 3656:element 3595:Bochner 3569:Trivial 3564:Tangent 3542:Product 3400:Regular 3378:)  3365:Perfect 3338:)  3303:)  3295:Content 3285:Complex 3226:Support 3199:-system 3088:Measure 2867:Results 2566:Measure 2127:of all 1914:are in 1642:L space 1148:In the 1042:, e.g. 559:removed 544:sources 491:natural 485:into a 473:and/or 407:Functor 377:Partial 354:Inverse 3732:Jordan 3717:Vitali 3676:vector 3605:Weakly 3467:Vector 3442:Signed 3395:Random 3336:Quasi- 3325:Finite 3305:Convex 3265:Banach 3255:Atomic 3083:spaces 3068:  2720:spaces 2641:spaces 2610:spaces 2561:spaces 2549:Banach 2490:  2456:  2332:  2329:  2146:, the 1999:CĂ dlĂ g 1782:, the 1652:-norm 1608:, for 787:subset 629:, any 503:metric 489:has a 471:domain 296:Smooth 271:Linear 67:domain 3574:Young 3495:Euler 3490:Dirac 3462:Tight 3390:Radon 3360:Outer 3330:Inner 3280:Brown 3275:Borel 3270:Besov 3260:Baire 2325:where 2144:] 2136:[ 2005:space 1523:with 922:from 894:} or 595:field 593:be a 507:space 461:is a 392:Space 3838:For 3727:Hahn 3583:Maps 3505:Haar 3376:Sub- 3130:Atom 3118:Sets 2905:For 2759:Maps 2488:ISBN 2454:ISBN 2238:for 2227:of 2149:norm 2078:Norm 1156:and 1118:and 987:and 789:(or 589:Let 542:any 540:cite 457:, a 69:and 2380:or 2280:max 2082:If 2017:Lip 1786:of 1644:of 1133:In 1114:In 1095:or 1087:In 1061:In 1023:In 994:In 967:In 926:to 882:to 874:In 836:of 822:Hom 641:in 633:in 553:by 501:or 465:of 463:set 453:In 3933:: 2476:; 2252:, 2247:≀ 2243:≀ 2140:, 1122:, 898:. 890:→ 862:. 847:→ 812:→ 625:→ 617:, 605:→ 509:. 235:→ 220:→ 207:→ 190:→ 175:→ 162:→ 145:→ 132:→ 115:→ 113:đ”č 100:→ 98:đ”č 89:đ”č 87:→ 44:↩ 3374:( 3334:( 3299:( 3197:π 3107:/ 3081:L 3044:e 3037:t 3030:v 2702:L 2639:L 2608:L 2585:/ 2559:L 2527:e 2520:t 2513:v 2496:. 2462:. 2360:) 2357:b 2354:, 2351:a 2348:( 2343:C 2335:y 2319:| 2315:) 2312:x 2309:( 2306:y 2302:| 2296:b 2290:x 2284:a 2263:y 2249:b 2245:x 2241:a 2236:) 2234:x 2232:( 2230:y 2211:) 2208:b 2205:, 2202:a 2199:( 2194:C 2161:y 2142:b 2138:a 2115:) 2112:b 2109:, 2106:a 2103:( 2098:C 2085:y 2060:R 2035:) 2031:R 2027:( 2022:0 1959:U 1953:O 1927:p 1923:L 1912:k 1889:p 1886:, 1883:k 1879:W 1856:) 1852:R 1848:( 1845:D 1821:) 1817:R 1813:( 1804:S 1770:) 1766:R 1762:( 1757:S 1731:p 1727:/ 1723:1 1718:) 1712:p 1707:| 1702:f 1698:| 1691:R 1681:( 1676:= 1671:p 1663:f 1650:p 1622:p 1616:1 1596:) 1592:R 1588:( 1583:p 1579:L 1554:) 1550:R 1546:( 1537:C 1508:) 1504:R 1500:( 1490:c 1486:C 1461:) 1457:R 1453:( 1444:C 1431:r 1417:) 1413:R 1409:( 1404:r 1400:C 1377:) 1373:R 1369:( 1364:0 1360:C 1335:) 1331:R 1327:( 1324:B 1299:) 1295:R 1291:( 1286:c 1282:C 1256:) 1252:R 1248:( 1245:C 1221:n 1216:R 1180:. 1174:W 1172:, 1170:V 1166:G 1162:G 1158:W 1154:V 1145:. 1130:. 1109:X 1058:. 1052:Y 1036:Y 1032:X 1020:. 1018:X 1004:X 991:. 964:. 962:X 958:X 944:Y 938:X 928:Y 924:X 911:X 907:X 896:Y 892:Y 888:X 884:Y 880:X 849:F 845:X 838:X 830:V 828:, 826:X 824:( 818:F 814:V 810:X 803:F 799:X 795:V 783:X 765:) 762:x 759:( 756:f 750:c 747:= 740:) 737:x 734:( 731:) 728:f 722:c 719:( 712:) 709:x 706:( 703:g 700:+ 697:) 694:x 691:( 688:f 685:= 678:) 675:x 672:( 669:) 666:g 663:+ 660:f 657:( 643:F 639:c 635:X 631:x 627:F 623:X 619:g 615:f 611:F 607:F 603:X 599:X 591:F 580:) 574:( 569:) 565:( 561:. 547:. 483:X 442:e 435:t 428:v 349:λ 238:X 233:ℂ 223:X 218:ℂ 209:ℂ 204:X 193:X 188:ℝ 178:X 173:ℝ 164:ℝ 159:X 148:X 143:â„€ 134:â„€ 129:X 118:X 103:X 84:X 52:) 50:x 46:f 42:x 20:)

Index

Functional space
Function
History of the function concept
domain
codomain
X → đ”č
đ”č → X
đ”č → X
X → â„€
â„€ → X
X → ℝ
ℝ → X
ℝ → X
X → ℂ
ℂ → X
ℂ → X
Classes/properties
Constant
Identity
Linear
Polynomial
Rational
Algebraic
Analytic
Smooth
Continuous
Measurable
Injective
Surjective
Bijective

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