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Paul Cohn

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in 1933, his father's business was confiscated and his mother dismissed. He moved to the Talmud-Tora-Schule, a Jewish school. In mid-1937, the family moved to Klosterallee. This was nearer the school, the synagogue and other pupils, being in the Jewish area. His German teacher was Dr. Ernst
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quarter. He attended a kindergarten then, in April 1930, moved to Alsterdorfer Straße School. After a while, he had a new teacher, a National Socialist, who picked on him and punished him without cause. Thus in 1931, he moved to the Meerweinstraße School where his mother taught.
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In all, Cohn wrote nearly 200 mathematical papers. He worked in many areas of algebra, mainly in non-commutative ring theory. His first papers, covering many topics, were published in 1952. He generalised a theorem due to
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in 1977. The second edition, in three volumes, was published by Wiley between 1982 and 1991. These volumes were in line with the British (rather than American) curricula at the time and include both
413:, 1982–1984, having been its secretary, 1965–1967 and a council member in 1968–1971, 1972–1975 and 1979–1982. He was editor of the society's monographs in 1968–1977 and 1980–1993. He was elected a 250:
When he was born, his parents were living with his mother's mother in Isestraße. After her death in October 1925, the family moved to a rented flat in a new building in Lattenkamp, in the
1832: 1523: 943: 556:(Wiley, 2000) as a more "user friendly" version for undergraduates (according to its preface); this book also includes a few selected topics from volumes II and III of 239:
Both of his parents were born in Hamburg, as were three of his grandparents. His ancestors came from various parts of Germany. His father fought in the German army in
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to work on a chicken farm, and never saw his parents again. He corresponded regularly with them until late 1941. At the end of
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His recreation was etymology and language in all its forms. He married Deirdre Sharon in 1958, and they had two daughters.
296:, acquired a work permit and worked in a factory for 4½ years. He passed the Cambridge Scholarship Examination, and won an 975: 579:, assumes knowledge of linear algebra. The material on basic theories (groups, rings, fields) is pursued in more depth in 1566: 1537: 1401: 1515: 479: 414: 410: 380: 201: 134: 1812: 451: 301: 209: 166: 1433: 1021: 518: 418: 352: 297: 1725: 1647: 690: 171: 95: 1154: 509:
appeared in 1965 (second edition 1981). After that, he concentrated on non-commutative ring theory and the
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Cohn was the only child of Jewish parents, James (or Jakob) Cohn, owner of an import business, and Julia (
1637: 1337: 1300: 1263: 1225: 395: 341: 325: 293: 264: 1787: 1782: 1777: 1576: 1571: 1461: 510: 390:. Cohn moved to University College London in 1984, together with the two other experts at Bedford on 387: 313: 128: 1720: 1556: 1159: 1007: 399: 321: 221: 109: 278:. He was released after four months but told to emigrate. Cohn went to Britain in May 1939 on the 1756: 1176: 934: 403: 417:
in 1980 and was on its council, 1985–1987. He was a member of the Mathematical Committee of the
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on 6 December 1941 and never returned. At the end of 1941, the farm closed. He trained as a
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The final incarnation of Cohn's algebra textbooks appeared in 2003 as two Springer volumes
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is (according to its preface) rather more concise and, while corresponding roughly with
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In the early 1980s, funding cuts caused the closure of the small colleges of the
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in 1967. By then, he was regarded as one of the world's leading algebraists.
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of rings into skew fields. The second, enlarged edition appeared in 1985.
533: 455: 1180: 217: 213: 105: 64: 355:, London. He held several visiting professorships, in America, Paris, 435: 1172: 1462:"Professor Paul Cohn: Mathematician who devoted himself to algebra" 552:. Cohn wrote a subsequent revised iteration of the first volume as 360: 356: 351:
Also in 1967, he became head of the Department of Mathematics at
320:) in 1951. He then spent a year as a Chargé de Recherches at the 595:, but reflects the shift of some material from these volumes to 289: 259: 1488: 1377:
Cohn, Paul; Struan Robertson (website owner) (February 2003).
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appeared in 1971. It covered the work of Cohn and others on
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on pseudo-valuations and in 1954 he published a work on
324:. On his return, he became a lecturer in mathematics at 247:. A street in Hamburg is named in memory of his mother. 754:
1995: "Skew Fields, Theory of General Division Rings",
446:. Papers over the next few years covered areas such as 525:. He included all of his own published results on the 944:
Biographical Memoirs of Fellows of the Royal Society
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in 1987. He retired in 1989, but remained active as
1744: 1530: 180: 159: 151: 115: 101: 91: 75: 46: 27: 1386:A History of Jews in Hamburg: The Kindertransports 906:Free Ideal Rings and Localization in General Rings 939:"Paul Moritz Cohn 8 January 1924 — 20 April 2006" 756:Encyclopedia of Mathematics and its Applications 438:spaces. In 1953 he published a joint paper with 1127: 1125: 1123: 1121: 1119: 243:; he was wounded several times and awarded the 1206:Bill Stephenson, ed. (July 2006). "Obituary". 406:and honorary research fellow until his death. 332:in 1961–1962, and for part of 1962 was at the 1500: 1073: 1071: 1069: 1067: 1065: 686:"Noncommutative unique factorization domains" 591:roughly corresponds to volumes II and III of 212:, 1986–1989, and author of many textbooks on 8: 1833:Academics of Queen Mary University of London 1139: 1137: 346:State University of New York at Stony Brook 1507: 1493: 1485: 1036: 1034: 1032: 1030: 1001: 999: 997: 995: 993: 991: 989: 987: 985: 983: 24: 1357: 1320: 1283: 1246: 1087: 1085: 1083: 956: 863:Algebraic Numbers and Algebraic Functions 779: 764:"From Hermite rings to Sylvester domains" 737: 702: 666: 521:and related classes of rings, especially 470:. After that, he moved into the areas of 1192: 1190: 288:, he learned that they were deported to 1017:MacTutor History of Mathematics Archive 917: 485:In 1957 Cohn published his first book, 274:), his father was arrested and sent to 1843:German emigrants to the United Kingdom 1828:Academics of University College London 1379:"Paul M. Cohn, (Childhood in Hamburg)" 312:He received a B.A in Mathematics from 1410:Council for the Mathematical Sciences 925: 923: 921: 340:. He was a visiting professor at the 336:. On his return, he became Reader at 216:. His work was mostly in the area of 204:(8 January 1924 – 20 April 2006) was 7: 1823:Alumni of Trinity College, Cambridge 334:University of California at Berkeley 270:On the night of 9/10 November 1938 ( 1803:21st-century British mathematicians 1798:20th-century British mathematicians 373:Mathematical Association of America 316:in 1948 and a Ph.D. (supervised by 1808:20th-century German mathematicians 1432:Schofield, Aidan (8 August 2006). 501:, appeared in 1958 and his third, 14: 1048:. United Kingdom: Debrett's Ltd. 739:10.1090/s0002-9947-1963-0153696-8 704:10.1090/s0002-9947-1963-0155851-x 668:10.1090/s0002-9939-1958-0103202-2 434:, and worked on the structure of 328:. He was a visiting professor at 1092:A & C Black (January 2006). 899:Dictionary of National Biography 893:Further Algebra and Applications 617: 589:Further Algebra and Applications 569:Further Algebra and Applications 276:Sachsenhausen concentration camp 263:Loewenberg, the son of the poet 35: 1359:10.1090/s0273-0979-1979-14622-6 1322:10.1090/S0273-0979-1989-15793-5 1285:10.1090/s0002-9904-1973-13243-4 1248:10.1090/S0002-9904-1959-10358-X 1303:Free rings and their relations 1266:Free rings and their relations 1046:Debrett's People of Today 2006 830:Free Rings and Their Relations 532:Cohn also wrote undergraduate 515:Free Rings and their Relations 1: 1309:Bull. Amer. Math. Soc. (N.S.) 976:Mathematics Genealogy Project 781:10.1090/s0002-9939-99-05189-8 722:"Rings with a weak algorithm" 1838:Fellows of the Royal Society 1208:De Morgan Society Newsletter 480:unique factorisation domains 208:Professor of Mathematics at 1406:London Mathematical Society 1262:Czerniakiewicz, A. (1973). 875:Introduction to Ring Theory 415:Fellow of the Royal Society 411:London Mathematical Society 381:London Mathematical Society 135:Fellow of the Royal Society 1859: 1305:, 2nd edn., by P. M. Cohn" 869:Elements of Linear Algebra 302:Trinity College, Cambridge 258:Following the rise of the 15: 519:free associative algebras 236:Cohen), a schoolteacher. 210:University College London 192: 167:University College London 144: 34: 1818:Kindertransport refugees 1793:People from Hamburg-Nord 1340:Skew field constructions 1022:University of St Andrews 851:Skew Field Constructions 650:"Rings of zero-divisors" 419:Science Research Council 409:He was president of the 16:Not to be confused with 1726:Walter Thompson Welford 1336:Bergman, G. M. (1979). 1299:Lewin, Jacques (1989). 691:Trans. Amer. Math. Soc. 478:, and non-commutative 172:Bedford College, London 96:University of Cambridge 1235:Bull. Amer. Math. Soc. 1153:Cohn, Paul M. (1971). 958:10.1098/rsbm.2014.0016 726:Trans. Amer. Math. Soc 655:Proc. Amer. Math. Soc. 1583:F. Gerard Friedlander 1434:"Professor Paul Cohn" 1400:Cooper, P. R. (ed.). 1346:Bull. Amer. Math. Soc 1272:Bull. Amer. Math. Soc 846:, second edition 1989 839:, second edition 1982 825:, second edition 1981 768:Proc. Amer. Math. Soc 540:appeared in 1974 and 489:, on groups that are 396:University of Alberta 367:. He was awarded the 342:University of Chicago 326:Manchester University 222:non-commutative rings 110:non-commutative rings 1465:(Newspaper obituary) 1437:(Newspaper obituary) 1155:"Rings of fractions" 1008:Robertson, Edmund F. 762:Cohn, P. M. (2000). 720:Cohn, P. M. (1963). 684:Cohn, P. M. (1963). 648:Cohn, P. M. (1958). 388:University of London 377:Senior Berwick Prize 369:Lester R. Ford Award 314:Cambridge University 129:Senior Berwick Prize 123:Lester R. Ford Award 1721:Lawrence Weiskrantz 1419:on 23 December 2012 1160:Amer. Math. Monthly 1006:O'Connor, John J.; 832:second edition 1985 497:. His second book, 400:Bar Ilan University 344:in 1964 and at the 322:University of Nancy 108:, concentrating in 1757:Philip W. Anderson 1544:Zbigniew Basinski 1098:. United Kingdom: 1012:"Paul Moritz Cohn" 627:has a profile for 571:. The material in 511:theory of algebras 491:analytic manifolds 404:professor emeritus 338:Queen Mary College 294:precision engineer 1813:Jewish scientists 1765: 1764: 1699:Louis Siminovitch 1222:Nijenhuis, Albert 1044:(November 2005). 823:Universal Algebra 633: 554:Classical Algebra 507:Universal algebra 425:Mathematical work 196: 195: 146:Scientific career 41:Paul Cohn in 1989 1850: 1716:Grenville Turner 1664:Montague Pennell 1627:Anthony Laughton 1509: 1502: 1495: 1486: 1481: 1479: 1477: 1466: 1460:(29 June 2006). 1453: 1451: 1449: 1438: 1428: 1426: 1424: 1418: 1412:. Archived from 1396: 1394: 1392: 1383: 1364: 1363: 1361: 1342:, by P. M. Cohn" 1333: 1327: 1326: 1324: 1296: 1290: 1289: 1287: 1268:, by P. M. Cohn" 1259: 1253: 1252: 1250: 1230:, by P. M. Cohn" 1218: 1212: 1211: 1203: 1197: 1194: 1185: 1184: 1150: 1144: 1141: 1132: 1129: 1114: 1113: 1089: 1078: 1075: 1060: 1059: 1038: 1025: 1024: 1003: 978: 969: 963: 962: 960: 927: 811:Linear Equations 793: 783: 774:(7): 1899–1904. 751: 741: 716: 706: 680: 670: 631: 621: 620: 550:abstract algebra 523:free ideal rings 513:. His monograph 499:Linear Equations 375:in 1972 and the 265:Jakob Loewenberg 199:Paul Moritz Cohn 182:Doctoral advisor 82: 60: 58: 51:Paul Moritz Cohn 39: 25: 1858: 1857: 1853: 1852: 1851: 1849: 1848: 1847: 1768: 1767: 1766: 1761: 1740: 1638:Anthony Leggett 1616:William Jarrett 1538:Muhammad Akhtar 1526: 1513: 1475: 1473: 1464: 1456: 1447: 1445: 1442:The Independent 1436: 1431: 1422: 1420: 1416: 1399: 1390: 1388: 1382:(Autobiography) 1381: 1376: 1373: 1368: 1367: 1335: 1334: 1330: 1298: 1297: 1293: 1261: 1260: 1256: 1220: 1219: 1215: 1205: 1204: 1200: 1195: 1188: 1173:10.2307/2316568 1152: 1151: 1147: 1142: 1135: 1130: 1117: 1110: 1100:A & C Black 1091: 1090: 1081: 1076: 1063: 1056: 1040: 1039: 1028: 1005: 1004: 981: 970: 966: 931:Bergman, George 929: 928: 919: 914: 881:Classic Algebra 800: 761: 719: 683: 647: 644: 639: 638: 637: 622: 618: 613: 605: 472:Jordan algebras 427: 398:in 1986 and to 353:Bedford College 330:Yale University 310: 281:Kindertransport 230: 176: 140: 92:Alma mater 87: 86:London, England 84: 80: 71: 62: 56: 54: 53: 52: 42: 30: 21: 12: 11: 5: 1856: 1854: 1846: 1845: 1840: 1835: 1830: 1825: 1820: 1815: 1810: 1805: 1800: 1795: 1790: 1785: 1780: 1770: 1769: 1763: 1762: 1760: 1759: 1754: 1748: 1746: 1742: 1741: 1739: 1738: 1733: 1728: 1723: 1718: 1713: 1708: 1701: 1696: 1693:John Shercliff 1689: 1684: 1679: 1672: 1667: 1660: 1655: 1653:Alan Muir Wood 1650: 1645: 1643:Graham Liggins 1640: 1635: 1630: 1623: 1618: 1613: 1606: 1604:Leslie Iversen 1601: 1599:Marshall Hatch 1596: 1594:W. D. Hamilton 1591: 1586: 1579: 1574: 1569: 1564: 1559: 1554: 1547: 1540: 1534: 1532: 1528: 1527: 1514: 1512: 1511: 1504: 1497: 1489: 1483: 1482: 1454: 1429: 1402:"Paul M. Cohn" 1397: 1372: 1369: 1366: 1365: 1352:(2): 414–420. 1328: 1315:(1): 139–142. 1291: 1278:(5): 873–878. 1254: 1241:(6): 338–341. 1213: 1198: 1186: 1167:(6): 596–615. 1145: 1133: 1115: 1108: 1079: 1061: 1054: 1026: 979: 964: 935:Stuart, Trevor 916: 915: 913: 910: 909: 908: 902: 895: 889: 883: 877: 871: 865: 859: 853: 847: 840: 833: 826: 819: 817:Solid Geometry 813: 807: 799: 796: 795: 794: 759: 752: 732:(2): 332–356. 717: 697:(2): 313–331. 681: 661:(6): 909–914. 643: 640: 623: 616: 615: 614: 612: 609: 604: 601: 546:linear algebra 503:Solid geometry 464:abelian groups 432:Wilhelm Magnus 426: 423: 309: 306: 229: 226: 194: 193: 190: 189: 184: 178: 177: 175: 174: 169: 163: 161: 157: 156: 153: 149: 148: 142: 141: 139: 138: 132: 126: 119: 117: 113: 112: 103: 102:Known for 99: 98: 93: 89: 88: 85: 83:(aged 82) 77: 73: 72: 63: 61:8 January 1924 50: 48: 44: 43: 40: 32: 31: 28: 13: 10: 9: 6: 4: 3: 2: 1855: 1844: 1841: 1839: 1836: 1834: 1831: 1829: 1826: 1824: 1821: 1819: 1816: 1814: 1811: 1809: 1806: 1804: 1801: 1799: 1796: 1794: 1791: 1789: 1786: 1784: 1781: 1779: 1776: 1775: 1773: 1758: 1755: 1753: 1752:Hannes Alfvén 1750: 1749: 1747: 1743: 1737: 1736:Lewis Wolpert 1734: 1732: 1731:Bill Wittrick 1729: 1727: 1724: 1722: 1719: 1717: 1714: 1712: 1709: 1707: 1706: 1705:Herbert Smith 1702: 1700: 1697: 1695: 1694: 1690: 1688: 1687:Derek Roberts 1685: 1683: 1682:Mark Richmond 1680: 1678: 1677: 1676:Humphrey Rang 1673: 1671: 1668: 1666: 1665: 1661: 1659: 1658:Roger Parsons 1656: 1654: 1651: 1649: 1646: 1644: 1641: 1639: 1636: 1634: 1631: 1629: 1628: 1624: 1622: 1619: 1617: 1614: 1612: 1611: 1607: 1605: 1602: 1600: 1597: 1595: 1592: 1590: 1589:Brian Gunning 1587: 1585: 1584: 1580: 1578: 1577:D. H. Everett 1575: 1573: 1570: 1568: 1567:Henry Daniels 1565: 1563: 1560: 1558: 1557:John Brooksby 1555: 1553: 1552: 1548: 1546: 1545: 1541: 1539: 1536: 1535: 1533: 1529: 1525: 1521: 1520:Royal Society 1517: 1510: 1505: 1503: 1498: 1496: 1491: 1490: 1487: 1472: 1471: 1463: 1459: 1455: 1444: 1443: 1435: 1430: 1415: 1411: 1407: 1403: 1398: 1387: 1380: 1375: 1374: 1370: 1360: 1355: 1351: 1347: 1343: 1341: 1332: 1329: 1323: 1318: 1314: 1310: 1306: 1304: 1295: 1292: 1286: 1281: 1277: 1273: 1269: 1267: 1258: 1255: 1249: 1244: 1240: 1237: 1236: 1231: 1229: 1223: 1217: 1214: 1209: 1202: 1199: 1193: 1191: 1187: 1182: 1178: 1174: 1170: 1166: 1162: 1161: 1156: 1149: 1146: 1140: 1138: 1134: 1131:Autobiography 1128: 1126: 1124: 1122: 1120: 1116: 1111: 1109:0-7136-7164-5 1105: 1101: 1097: 1096: 1088: 1086: 1084: 1080: 1074: 1072: 1070: 1068: 1066: 1062: 1057: 1055:1-870520-90-4 1051: 1047: 1043: 1037: 1035: 1033: 1031: 1027: 1023: 1019: 1018: 1013: 1009: 1002: 1000: 998: 996: 994: 992: 990: 988: 986: 984: 980: 977: 973: 968: 965: 959: 954: 950: 946: 945: 940: 936: 932: 926: 924: 922: 918: 911: 907: 903: 901:(contributor) 900: 897:2004: Oxford 896: 894: 890: 888: 887:Basic Algebra 884: 882: 878: 876: 872: 870: 866: 864: 860: 858: 854: 852: 848: 845: 841: 838: 834: 831: 827: 824: 820: 818: 814: 812: 808: 806: 802: 801: 797: 791: 787: 782: 777: 773: 769: 765: 760: 757: 753: 749: 745: 740: 735: 731: 727: 723: 718: 714: 710: 705: 700: 696: 693: 692: 687: 682: 678: 674: 669: 664: 660: 657: 656: 651: 646: 645: 641: 635: 634: 626: 610: 608: 602: 600: 598: 597:Basic Algebra 594: 590: 586: 582: 581:Basic Algebra 578: 574: 573:Basic Algebra 570: 566: 565:Basic Algebra 561: 559: 555: 551: 547: 543: 539: 535: 530: 528: 524: 520: 516: 512: 508: 504: 500: 496: 492: 488: 483: 481: 477: 473: 469: 465: 461: 457: 453: 449: 445: 441: 437: 433: 424: 422: 420: 416: 412: 407: 405: 401: 397: 393: 389: 384: 382: 378: 374: 370: 366: 362: 358: 354: 349: 347: 343: 339: 335: 331: 327: 323: 319: 315: 307: 305: 303: 299: 295: 291: 287: 283: 282: 277: 273: 272:Kristallnacht 268: 266: 261: 256: 253: 248: 246: 242: 237: 235: 227: 225: 223: 220:, especially 219: 215: 211: 207: 203: 200: 191: 188: 185: 183: 179: 173: 170: 168: 165: 164: 162: 158: 154: 150: 147: 143: 136: 133: 130: 127: 124: 121: 120: 118: 114: 111: 107: 104: 100: 97: 94: 90: 79:20 April 2006 78: 74: 70: 66: 49: 45: 38: 33: 26: 23: 19: 1711:Walter Spear 1703: 1691: 1674: 1670:George Radda 1662: 1648:Tony Linnane 1625: 1610:Kenneth Jack 1608: 1581: 1572:Phil Elliott 1561: 1549: 1542: 1474:. Retrieved 1468: 1446:. Retrieved 1440: 1421:. Retrieved 1417:(Newsletter) 1414:the original 1405: 1389:. 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Index

Paul Cohen

Hamburg
Germany
University of Cambridge
Algebra
non-commutative rings
Lester R. Ford Award
Senior Berwick Prize
Fellow of the Royal Society
University College London
Bedford College, London
Doctoral advisor
Philip Hall
FRS
Astor
University College London
algebra
algebra
non-commutative rings
World War I
Iron Cross
Winterhude
Nazis
Jakob Loewenberg
Kristallnacht
Sachsenhausen concentration camp
Kindertransport
the War
Riga

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