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Talk:Tensor product of Hilbert spaces

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84: 74: 53: 22: 515:). It seems to require the Fubini theorem, which in turn requires Οƒ-finiteness. Now it may be that there is an entirely different sort of argument that there exists an isomorphism between these two spaces (e.g., by showing that they have the same cardinal as Hilbert dimension), but this seems to be a less natural sort of isomorphism. 2378: 736:
You can find it in Kadison and Ringrose (search Google books and then search inside for "weak Hilbert Schmidt"). Reducing the definition from multilinear to bilinear case and adapting a bit to the notation used in this article the definitions go something like
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for the completed tensor product. For the second issue you raise, the proof I know of this result uses Fubini's theorem, which I believe requires sigma-finite measures (does this imply separability of L^2?), although there are probably still better results.
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That's why I made the edits that I did, but any better fix would be fine with me. Anyway, the error is prehistoric; it was there when sillyrabbit copied it over in 2008 from another article. I'm surpirsed it hasn never been fixed.
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What happens I think is that any fixed element of the Hilbertian tensor product belongs to the product of separable subspaces on both sides, so that the general case should follow from the proof in the separable case.
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I've put the definition of weakly Hilbert Schmidt functional in this article, it has already bemoved from the Hilbert Schmidt operator article (probably because it was wrong). I hope that everything is correct now.
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In books they sometimes use a hat. And one cannot say that only the completed tensor product will appear in discussions: the space of simple functions is also important.
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of copies of the two-point space {-1, 1}, each copy equipped with the probability that gives mass 1/2 to each point. This is a probability but the
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I know what its trying to say, but, as a formula, the above just doesn't make sense. So, for example ... obviously, the intent is that
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What guarantees the function defined in the text will be an inner product? I don't see why it must be positive definite.
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I forgot to answer one of your questions: you may define the product probability measure on the uncountable product
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I find a little unsatisfactory that the completed tensor product is still denoted by
620:. Anyway this is a minor issue that can wait a few days to find a reference for... 102: 981:{\displaystyle \phi _{v}=(u_{1},u_{2})\mapsto \langle L(u_{1},u_{2}),v\rangle } 721:
what does that mean? It's not defined here, nor at Hilbert-Schmidt operator.--
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if it is a bounded bilinear functional (p. 127). A bounded linear mapping
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I am attempting to repair this problematic formula, which also occurs in
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I that's ok maybe somebody wants to put this into the article? (ezander)
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However it looks, it is wrong and also not what is written in the book.
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in the section "Examples and applications", giving the strange equation
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It turns out that the set of linear combinations is in fact dense in
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Also I am not sure that the restriction of separability is needed in
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mean? The intent seemed to be to use a \mapsto not a \to, so that
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First of all one has to make precise what Οƒ-field is taken on
15: 2064:{\displaystyle x_{1}\otimes x_{2}\mapsto x_{1}^{*}(-)x_{2}} 1788:{\displaystyle x_{1}\otimes x_{2}\mapsto x_{1}^{*}(-)x_{2}} 1987:{\displaystyle H_{1}\otimes H_{2}\to (H_{1}^{*}\to H_{2})} 255:{\displaystyle L^{2}(X)\otimes L^{2}(Y)=L^{2}(X\times Y).} 491:. What I'm a little unclear on is whether the products Ο† 2130:{\displaystyle x_{1}\otimes x_{2}\in H_{1}\otimes H_{2}} 1517:{\displaystyle x^{*}\in H_{1}^{*}\to x^{*}(x_{1})x_{2}} 1869:
but this doesn't make much sense either. By contrast,
2246: 2213:{\displaystyle x_{1}^{*}(-)x_{2}\in (H_{1}\to H_{2})} 2143: 2077: 2000: 1923: 1875: 1804: 1724: 1658: 1592: 1560: 1533: 1446: 1308: 1281: 1248: 1215: 1133: 1081: 1042: 994: 888: 862: 806: 750: 571: 439: 319: 179: 101:, a collaborative effort to improve the coverage of 1917:What we really want to write is that there's a map 1202:{\displaystyle \sum _{n,m}|\phi (e_{n},f_{m})|^{2}} 2372: 2212: 2129: 2063: 1986: 1906: 1861: 1787: 1710: 1644: 1578: 1546: 1516: 1321: 1294: 1267: 1234: 1201: 1119: 1054: 1028: 980: 874: 844: 788: 612: 483: 334: 254: 1127:need to be bounded and bilinear we require that 1862:{\displaystyle H_{1}^{*}\to x^{*}(x_{1})x_{2}} 1711:{\displaystyle x^{*}\mapsto x^{*}(x_{1})x_{2}} 8: 1120:{\displaystyle \phi :H_{1}\times H_{2}\to C} 1023: 1017: 1008: 995: 975: 934: 789:{\displaystyle \phi :H_{1}\times H_{2}\to C} 2238:Ohhhh. I get it it was trying to say this: 19: 1645:{\displaystyle x^{*}\to x^{*}(x_{1})x_{2}} 158:Notation for the Hilbertian tensor product 47: 2360: 2347: 2334: 2317: 2303: 2286: 2281: 2268: 2255: 2247: 2245: 2201: 2188: 2172: 2153: 2148: 2142: 2121: 2108: 2095: 2082: 2076: 2055: 2036: 2031: 2018: 2005: 1999: 1975: 1962: 1957: 1941: 1928: 1922: 1898: 1885: 1880: 1874: 1853: 1840: 1827: 1814: 1809: 1803: 1779: 1760: 1755: 1742: 1729: 1723: 1702: 1689: 1676: 1663: 1657: 1636: 1623: 1610: 1597: 1591: 1570: 1565: 1559: 1538: 1532: 1508: 1495: 1482: 1469: 1464: 1451: 1445: 1313: 1307: 1286: 1280: 1256: 1247: 1223: 1214: 1193: 1188: 1178: 1165: 1150: 1138: 1132: 1105: 1092: 1080: 1041: 1002: 993: 960: 947: 922: 909: 893: 887: 861: 830: 817: 805: 774: 761: 749: 595: 576: 570: 466: 444: 438: 321: 320: 318: 228: 206: 184: 178: 1029:{\displaystyle \|\phi _{v}\|\leq M\|v\|} 845:{\displaystyle L:H_{1}\times H_{2}\to K} 484:{\displaystyle L^{2}(X)\otimes L^{2}(Y)} 49: 988:is a Hilbert-Schmidt functional and 335:{\displaystyle {\widehat {\otimes }}} 7: 95:This article is within the scope of 38:It is of interest to the following 1907:{\displaystyle H_{1}^{*}\to H_{2}} 14: 2400:Mid-priority mathematics articles 115:Knowledge:WikiProject Mathematics 2395:Start-Class mathematics articles 1795:does make sense, notationally. 613:{\displaystyle 1_{A}(x)1_{B}(y)} 118:Template:WikiProject Mathematics 82: 72: 51: 20: 405:, is an orthonormal basis of L( 135:This article has been rated as 2353: 2340: 2327: 2296: 2207: 2194: 2181: 2165: 2159: 2048: 2042: 2024: 1981: 1968: 1950: 1947: 1891: 1846: 1833: 1820: 1798:The alternative parse is that 1772: 1766: 1748: 1695: 1682: 1669: 1629: 1616: 1603: 1501: 1488: 1475: 1262: 1249: 1229: 1216: 1189: 1184: 1158: 1151: 1111: 966: 940: 931: 928: 902: 836: 780: 607: 601: 588: 582: 478: 472: 456: 450: 313:It bothers me too. I suggest 246: 234: 218: 212: 196: 190: 1: 2233:14:06, 23 November 2013 (UTC) 1586:but then, what the heck does 1390:11:08, 27 November 2014 (UTC) 1368:12:38, 23 November 2013 (UTC) 1075:is incorrect. Not only does 688:22:22, 30 November 2008 (UTC) 654:22:13, 30 November 2008 (UTC) 630:22:06, 30 November 2008 (UTC) 531:21:57, 30 November 2008 (UTC) 507:) span a dense subspace of L( 421:is an orthonormal basis of L( 378:21:34, 30 November 2008 (UTC) 359:21:01, 30 November 2008 (UTC) 308:20:16, 30 November 2008 (UTC) 109:and see a list of open tasks. 1417:12:06, 8 December 2014 (UTC) 1346:13:00, 19 October 2011 (UTC) 731:14:20, 25 August 2011 (UTC) 712:14:09, 25 August 2010 (UTC) 433:is an orthonormal basis of 2416: 1073:Hilbert-Schmidt functional 798:Hilbert-Schmidt functional 1579:{\displaystyle H_{1}^{*}} 565:) will span the products 134: 67: 46: 1358:. It looks good to me. 1356:Hilbert-Schmidt operator 638:Yes, that makes sense. 141:project's priority scale 1268:{\displaystyle (f_{m})} 1235:{\displaystyle (e_{n})} 1055:{\displaystyle M\geq 0} 98:WikiProject Mathematics 2374: 2214: 2131: 2065: 1988: 1908: 1863: 1789: 1712: 1646: 1580: 1548: 1518: 1323: 1296: 1269: 1236: 1203: 1121: 1056: 1036:for some real number 1030: 982: 876: 875:{\displaystyle v\in K} 854:weakly Hilbert-Schmidt 846: 790: 717:weakly Hilbert Schmidt 614: 485: 336: 256: 28:This article is rated 2375: 2215: 2132: 2066: 1989: 1909: 1864: 1790: 1713: 1647: 1581: 1549: 1547:{\displaystyle x^{*}} 1519: 1324: 1322:{\displaystyle H_{2}} 1297: 1295:{\displaystyle H_{1}} 1270: 1237: 1204: 1122: 1057: 1031: 983: 877: 847: 791: 615: 486: 337: 257: 2244: 2141: 2075: 1998: 1921: 1873: 1802: 1722: 1656: 1590: 1558: 1531: 1444: 1306: 1279: 1246: 1213: 1131: 1079: 1071:The definition of a 1040: 992: 886: 860: 804: 748: 569: 437: 317: 177: 121:mathematics articles 2291: 2158: 2041: 1967: 1914:does make sense. 1890: 1819: 1765: 1575: 1474: 1429:Problematic formula 425:), then certainly Ο† 2370: 2368: 2277: 2210: 2144: 2127: 2061: 2027: 1984: 1953: 1904: 1876: 1859: 1805: 1785: 1751: 1708: 1642: 1576: 1561: 1544: 1514: 1460: 1319: 1292: 1265: 1232: 1199: 1149: 1117: 1052: 1026: 978: 872: 842: 786: 610: 481: 332: 290:and similarly for 252: 90:Mathematics portal 34:content assessment 1554:is an element of 1354:I copied it into 1209:be finite (where 1134: 329: 285:(Y) are separable 155: 154: 151: 150: 147: 146: 2407: 2379: 2377: 2376: 2371: 2369: 2365: 2364: 2352: 2351: 2339: 2338: 2322: 2321: 2308: 2307: 2290: 2285: 2273: 2272: 2260: 2259: 2219: 2217: 2216: 2211: 2206: 2205: 2193: 2192: 2177: 2176: 2157: 2152: 2136: 2134: 2133: 2128: 2126: 2125: 2113: 2112: 2100: 2099: 2087: 2086: 2070: 2068: 2067: 2062: 2060: 2059: 2040: 2035: 2023: 2022: 2010: 2009: 1993: 1991: 1990: 1985: 1980: 1979: 1966: 1961: 1946: 1945: 1933: 1932: 1913: 1911: 1910: 1905: 1903: 1902: 1889: 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937: 923: 919: 915: 910: 906: 899: 894: 890: 882:the mapping 869: 866: 863: 855: 839: 831: 827: 823: 818: 814: 810: 807: 799: 783: 775: 771: 767: 762: 758: 754: 751: 743: 742: 741: 740: 735: 734: 733: 732: 728: 724: 716: 714: 713: 709: 705: 697: 689: 685: 681: 677: 673: 669: 665: 664: 663: 662: 661: 660: 655: 651: 643: 637: 636: 635: 634: 631: 627: 623: 604: 596: 592: 585: 577: 573: 564: 556: 548: 544: 540: 539: 532: 528: 520: 514: 510: 506: 498: 475: 467: 463: 459: 453: 445: 441: 424: 420: 416: 408: 404: 400: 392: 391: 390: 389: 388: 387: 386: 379: 375: 371: 366: 365: 364: 363: 360: 356: 348: 326: 323: 312: 311: 310: 309: 305: 301: 297: 293: 286: 282: 278: 274: 271: 270: 269: 266: 249: 243: 240: 237: 229: 225: 221: 215: 207: 203: 199: 193: 185: 181: 173: 172: 171: 169: 165: 157: 142: 138: 132: 129: 128: 125: 108: 104: 100: 99: 91: 85: 80: 78: 75: 71: 70: 66: 60: 57: 54: 50: 45: 41: 35: 27: 23: 18: 17: 2221: 1916: 1797: 1526: 1432: 1072: 856:if for all 853: 797: 720: 704:94.21.187.19 701: 675: 671: 667: 641:siβ„“β„“y rabbit 562: 554: 546: 542: 518:siβ„“β„“y rabbit 512: 508: 504: 496: 422: 418: 414: 406: 402: 398: 384: 346:siβ„“β„“y rabbit 295: 291: 289: 284: 280: 277:(X Γ— Y), if 276: 272: 267: 264: 167: 163: 161: 137:Mid-priority 136: 96: 62:Mid‑priority 40:WikiProjects 112:Mathematics 103:mathematics 59:Mathematics 30:Start-class 2389:Categories 2225:User:Linas 1360:User:Linas 744:A mapping 393:Well, if Ο† 1062:(p. 131). 409:), and ψ 281:(X) and 139:on the 1994:which 36:scale. 796:is a 737:this: 2229:talk 2137:and 2071:for 1413:talk 1409:TSBM 1386:talk 1364:talk 1342:talk 1302:and 1242:and 727:talk 708:talk 684:talk 680:Bdmy 648:talk 626:talk 622:Bdmy 525:talk 374:talk 370:Bdmy 353:talk 304:talk 300:Bdmy 852:is 131:Mid 2391:: 2336:βˆ— 2328:↦ 2319:βˆ— 2297:β†’ 2288:βˆ— 2262:βŠ— 2231:) 2195:β†’ 2179:∈ 2163:βˆ’ 2155:βˆ— 2115:βŠ— 2102:∈ 2089:βŠ— 2046:βˆ’ 2038:βˆ— 2025:↦ 2012:βŠ— 1969:β†’ 1964:βˆ— 1948:β†’ 1935:βŠ— 1892:β†’ 1887:βˆ— 1829:βˆ— 1821:β†’ 1816:βˆ— 1770:βˆ’ 1762:βˆ— 1749:↦ 1736:βŠ— 1678:βˆ— 1670:↦ 1665:βˆ— 1612:βˆ— 1604:β†’ 1599:βˆ— 1572:βˆ— 1540:βˆ— 1484:βˆ— 1476:β†’ 1471:βˆ— 1458:∈ 1453:βˆ— 1437:: 1415:) 1388:) 1366:) 1344:) 1156:Ο• 1136:βˆ‘ 1112:β†’ 1099:Γ— 1083:Ο• 1047:β‰₯ 1024:β€– 1018:β€– 1012:≀ 1009:β€– 1000:Ο• 996:β€– 976:⟩ 935:⟨ 932:↦ 891:Ο• 867:∈ 837:β†’ 824:Γ— 781:β†’ 768:Γ— 752:Ο• 729:) 710:) 686:) 652:) 628:) 557:)ψ 529:) 499:)ψ 460:βŠ— 429:βŠ—Οˆ 413:, 397:, 376:) 357:) 327:^ 324:βŠ— 306:) 298:. 294:βŠ— 241:Γ— 200:βŠ— 166:βŠ— 2362:2 2358:x 2354:) 2349:1 2345:x 2341:( 2332:x 2315:x 2305:2 2301:H 2283:1 2279:H 2275:: 2270:2 2266:x 2257:1 2253:x 2227:( 2208:) 2203:2 2199:H 2190:1 2186:H 2182:( 2174:2 2170:x 2166:) 2160:( 2150:1 2146:x 2123:2 2119:H 2110:1 2106:H 2097:2 2093:x 2084:1 2080:x 2057:2 2053:x 2049:) 2043:( 2033:1 2029:x 2020:2 2016:x 2007:1 2003:x 1982:) 1977:2 1973:H 1959:1 1955:H 1951:( 1943:2 1939:H 1930:1 1926:H 1900:2 1896:H 1882:1 1878:H 1855:2 1851:x 1847:) 1842:1 1838:x 1834:( 1825:x 1811:1 1807:H 1781:2 1777:x 1773:) 1767:( 1757:1 1753:x 1744:2 1740:x 1731:1 1727:x 1704:2 1700:x 1696:) 1691:1 1687:x 1683:( 1674:x 1661:x 1638:2 1634:x 1630:) 1625:1 1621:x 1617:( 1608:x 1595:x 1567:1 1563:H 1536:x 1510:2 1506:x 1502:) 1497:1 1493:x 1489:( 1480:x 1466:1 1462:H 1449:x 1411:( 1384:( 1362:( 1340:( 1315:2 1311:H 1288:1 1284:H 1263:) 1258:m 1254:f 1250:( 1230:) 1225:n 1221:e 1217:( 1195:2 1190:| 1185:) 1180:m 1176:f 1172:, 1167:n 1163:e 1159:( 1152:| 1146:m 1143:, 1140:n 1115:C 1107:2 1103:H 1094:1 1090:H 1086:: 1050:0 1044:M 1021:v 1015:M 1004:v 973:v 970:, 967:) 962:2 958:u 954:, 949:1 945:u 941:( 938:L 929:) 924:2 920:u 916:, 911:1 907:u 903:( 900:= 895:v 870:K 864:v 840:K 832:2 828:H 819:1 815:H 811:: 808:L 784:C 776:2 772:H 763:1 759:H 755:: 725:( 706:( 682:( 676:P 674:( 672:L 668:P 644:( 624:( 608:) 605:y 602:( 597:B 593:1 589:) 586:x 583:( 578:A 574:1 563:y 561:( 559:j 555:x 553:( 551:i 547:Y 545:Γ— 543:X 521:( 513:Y 511:Γ— 509:X 505:y 503:( 501:j 497:x 495:( 493:i 479:) 476:Y 473:( 468:2 464:L 457:) 454:X 451:( 446:2 442:L 431:j 427:i 423:Y 419:J 417:∈ 415:j 411:j 407:X 403:I 401:∈ 399:i 395:i 372:( 349:( 302:( 296:H 292:L 283:L 279:L 275:L 250:. 247:) 244:Y 238:X 235:( 230:2 226:L 222:= 219:) 216:Y 213:( 208:2 204:L 197:) 194:X 191:( 186:2 182:L 168:L 164:L 143:. 42::

Index


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Bdmy
talk
20:16, 30 November 2008 (UTC)
siβ„“β„“y rabbit
talk
21:01, 30 November 2008 (UTC)
Bdmy
talk
21:34, 30 November 2008 (UTC)
siβ„“β„“y rabbit
talk
21:57, 30 November 2008 (UTC)
Bdmy
talk
22:06, 30 November 2008 (UTC)
siβ„“β„“y rabbit
talk

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