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Biographical Memoirs: VOLUME 75
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Biographical Memoirs: VOLUME 75 RICHARD DAGOBERT BRAUER February 10, 1901–April 17, 1977 BY J. A. GREEN RICHARD DAGOBERT BRAUER, Emeritus Professor at Harvard University and one of the foremost algebraists of this century, died on April 17, 1977, in Boston, Massachusetts. He had been an Honorary Member of the Society since 1963. Richard Brauer was born on February 10, 1901, in Berlin-Charlottenburg, Germany; he was the youngest of three children of Max Brauer and his wife Lilly Caroline. Max Brauer was an influential and wealthy businessman in the wholesale leather trade, and Richard was brought up in an affluent and cultured home with his brother Alfred and his sister Alice. Richard Brauer's early years were happy and untroubled. He attended the Kaiser-Friedrich-Schule in Charlottenburg from 1907 until he graduated from there in 1918. He was already interested in science and mathematics as a young boy, an interest which owed much much to the influence of his gifted brother Alfred, who was seven years older than Richard. Adapted from Bulletin of the London Mathematical Society 10(1978):317-25, 337-42 and reprinted with permission of the London Mathematical Society. Bracketed numbers refer to entries in the bibliography at the end of this memoir.
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Biographical Memoirs: VOLUME 75 His youth saved him from service with the German army during the first World War. He graduated from high school in September 1918, and he and his classmates were drafted for civilian service in Berlin. Two months later the war ended, and in February 1919 he was able to enroll at the Technische Hochschule in Berlin-Charlottenburg (now the Technische Universität Berlin). The choice of a technical curriculum had been the result of Richard's boyhood ambition to become an inventor, but he soon realised that, in his own words, his interests were “more theoretical than practical,” and he transferred to the University of Berlin after one term. He studied there for a year, then spent the summer semester of 1920 at the University of Freiburg—it was a tradition among German students to spend at least one term in a different university—and returned that autumn to the University of Berlin, where he remained until he took his Ph.D. degree in 1925. The University of Berlin contained many brilliant mathematicians and physicists in the nineteen-twenties. During his years as a student Richard Brauer attended lectures and seminars by Bierberbach, Carathéodory, Einstein, Knopp, von Laue, von Mises, Planck, E. Schmidt, I. Schur and G. Szegö, among many others. In the customary postscript to his doctoral dissertation , Brauer mentions particularly Bieberbach, von Mises, E. Schmidt and I. Schur. There is no doubt that the profoundest influence among these was that of Issai Schur. Schur had been a pupil of G. Frobenius, and had graduated at Berlin in 1901; he had been “ordentlicher Professor” (full professor) there since 1919. His lectures on algebra and number theory were famous for their masterly structure and polished delivery. Richard Brauer's first published paper arose from a problem posed by Schur in a seminar on number theory in the winter semester of 1921. Alfred Brauer also participated in this
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Biographical Memoirs: VOLUME 75 seminar. He was less fortunate than Richard, in that his studies were seriously interrupted by the war; he had served for four years with the army and been very badly wounded. The Brauer brothers succeeded in solving Schur's problem in one week, and in the same week a completely different solution was found by Heinz Hopf. The Brauer proof was published in the book by Pólya and Szegö (1925, p. 137, pp. 347-350), and some time later the Brauers and Hopf combined and generalized their proofs in their joint paper . Richard Brauer also participated in seminars conducted by E. Schmidt and L. Bieberbach on differential equations and integral equations—a proof which he gave in a talk at this seminar in 1922 appears, with suitable acknowledgment, in Bieberbach's book on differential equations (1923, p. 129). But Brauer became more and more involved in Schur's seminar. As a participant in this, he reported on the first part of Schur's paper “Neue Anwendungen der Integralrechnung auf Probleme der Invariantentheorie” (1924), which shows how Hurwitz's method of group integration can be used for the study of the linear representations of continuous linear groups. In the second part of this work, Schur applied his method to determine all the irreducible (continuous, finite-dimensional) representations of the real orthogonal and rotation groups. He suggested to Brauer that it might also be possible to do this in a more algebraic way. This became Brauer's doctoral thesis , for which he was awarded his Ph.D. summa cum laude on March 16, 1926. On September 17, 1925 Richard Brauer married Ilse Karger, a fellow-student whom he had first met in November 1920 at Schur's lecture course on number theory. Ilse Karger was the daughter of a Berlin physician. She studied experimental physics and took her Ph.D. in 1924, but she realized
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Biographical Memoirs: VOLUME 75 during the course of her studies that she was more interested in mathematics than in physics, and she took mathematics courses with the idea of becoming a school-teacher. In fact she subsequently held instructorships in mathematics at the Universities of Toronto and Michigan and at Brandeis University, and she eventually became assistant professor at Boston University. The marriage of Ilse and Richard Brauer was a long and very happy one. Their two sons George Ulrich (born 1927) and Fred Günther (born 1932) both became active research mathematicians, and presently hold chairs at, respectively, the University of Minnesota, Minneapolis, and the University of Wisconsin, Madison. Brauer's first academic post was at the University of Königsberg (now Kaliningrad), where he was offered an assistantship by K. Knopp. He started there in the autumn of 1925, became Privatdozent (this is the grade which confers the right to give lectures) in 1927, and remained in Königsberg until 1933. The mathematics department at that time had two chairs, occupied by G. Szegö and K. Reidemeister (Knopp left soon after Brauer arrived), with W. Rogosinski, Brauer and T. Kaluza in more junior positions. The Brauers enjoyed the friendly social life of this small department, and Richard Brauer enjoyed the varied teaching which he was required to give. During this time he also met mathematicians from other universities with whom he had common interests, particularly Emmy Noether and H. Hasse. This was the time when Brauer made his fundamental contribution to the algebraic theory of simple algebras. In , he and Emmy Noether characterized Schur's “splitting fields” of a given irreducible representation G of a given finite dimensional algebra, in terms of the division algebra associated to G. Brauer developed in ,  and  a theory
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Biographical Memoirs: VOLUME 75 of central division algebras over a given perfect field, and showed in  that the isomorphism classes of these algebras can be used to form a commutative group whose properties give great insight into the structure of simple algebras. This group became known (to its author's embarrassment!) as the “Brauer group,” and played an essential part in the proof by Brauer, Noether and Hasse  of the long-standing conjecture that every rational division algebra is cyclic over its centre. Early in 1933 Hitler became Chancellor of the German Reich, and by the end of March had established himself as dictator. In April the new Nazi régime began to implement its notorious antisemitic policies with a series of laws designed to remove Jews from the “intellectual professions” such as the civil service, the law and teaching. All Jewish university teachers were dismissed from their posts. Later some exemptions were made—it is said at the request of Hindenburg, the aged and by now virtually powerless President of the Reich—to allow those who had held posts before the first World War, and those who had fought in that war, to retain their jobs. Richard Brauer came into neither of these categories, and was not reinstated. It is tragically well known that the “clemency” extended to those who were allowed to remain at their posts was short-lived. Alfred Brauer, whose war service exempted him from dismissal in 1933, eventually came to the United States in 1939. Their sister Alice stayed in Germany and died in an extermination camp during the second World War. The abrupt dismissal of Jewish intellectuals in Germany in 1933 evoked shock and bewilderment abroad. Committees were set up and funds raised, particularly in Great Britain and the United States, to find places for these first refugees from Nazism. Through the agency of the Emergency Committee for the Aid of Displaced German Schol-
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Biographical Memoirs: VOLUME 75 ars, which had its headquarters in New York, and with the help of the Jewish community in Lexington, Kentucky, enough money was raised to offer Richard Brauer a visiting professorship for one year at the University of Kentucky. He arrived in Lexington in November 1933, speaking very little English, but already with a reputation as one of the most promising young mathematicians of his day. His arrival was greeted with sympathetic curiosity; the local paper reported an interview with the newcomer, conducted through an interpreter, and recorded Brauer's first impressions of American football. Ilse Brauer and the two children, who had stayed behind in Berlin, followed three months later. The friendly welcome which the Brauers found in Lexington, and their own adaptability, made the transition to life in the United States an easy one. In that academic year 1933-34 the Institute for Advanced Study at Princeton came into full operation. Among its first permanent professors was Hermann Weyl. Brauer did not know Weyl personally, but had always hoped to do so from the time when he had been writing his thesis on the rotation group; Weyl's classic papers, in which he combined the infinitesimal methods of Lie and E. Cartan with Schur's group integration method to determine the characters of all compact semisimple Lie groups, appeared in 1925-26. It was therefore the fulfillment of a dream for Brauer to be invited to spend the year 1934-35 at the Institute as Weyl's assistant. Brauer's great admiration and respect for Weyl were returned. Many years later Weyl wrote that working with Brauer had been the happiest experience of scientific collaboration which he had ever had in his life. The famous joint paper on spinors  was written during this year, and also Brauer's paper  on the Betti numbers of the classical Lie groups. Pontrjagin had recently determined these numbers by topological means (1935), and Brauer, in
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Biographical Memoirs: VOLUME 75 response to a question by Weyl, was able to give in a few weeks an alternative purely algebraic treatment based on invariant theory. The references to Brauer in Weyl's book The Classical Groups (1939) make evident the esteem in which he held his younger colleague. Brauer collaborated with N. Jacobson, who had been Weyl's assistant during the second half of 1933-34, in writing up notes of Weyl's lectures on Lie groups, and of some of the seminar talks which followed. These appeared under the title The Structure and Representation of Continuous Groups (Princeton, 1934-1935). The year at Princeton was very productive of new mathematical contacts for Brauer. The Institute was already a brilliant centre for mathematics. Besides its permanent professors (J. W. Alexander, A. Einstein, J. von Neumann, O. Veblen and Weyl) there were in the School of Mathematics that year four assistants and thirty-four “workers” (i.e. visiting members). Among the latter were W. Magnus, C. L. Siegel and O. Zariski, all of whom were to become lifelong friends of the Brauers. Brauer's mathematical contact with Siegel was particularly close, and bore fruit later in . In addition to the mathematicians at the Institute, the mathematics faculty at Princeton University (who were then housed in the same building) included Bochner, Lefschetz and Wedderburn. The Brauers were also able to see Emmy Noether regularly, because she was giving a weekly seminar at Princeton that year. Emmy Noether was another refugee from Nazism, and held a post as visiting professor at Bryn Mawr College, Pennsylvania, from 1933 until her death in the spring of 1935. It was a result of the account of him given by Emmy Noether when she visited the University of Toronto that Brauer was offered an assistant professorship there. He took up this post in the autumn of 1935, and was to remain in Toronto, holding in due course positions as associate and
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Biographical Memoirs: VOLUME 75 then full professor, until 1948. At Toronto, Brauer developed his famous modular representation theory of finite groups, which will probably always be regarded as his most original and characteristic contribution to mathematics. Some of the preliminaries to this theory appeared in 1935 in , but the first full treatment of modular characters, decomposition numbers, Cartan invariants and blocks was published jointly with C. J. Nesbitt in 1937 (). Nesbitt was Brauer's doctoral student at Toronto from 1935-37, and he has given this interesting account of their collaboration. “Curiously, as thesis advisor, he did not suggest much preparatory reading or literature search. Instead, we spent many hours exploring examples of the representation theory ideas that were evolving in his mind. Eventually, I pursued a few of the ideas for thesis purposes, they received some elegant polishing by him, and later were abstracted and expanded by another great friend, Tadasi Nakayama. Professor Brauer generously ascribed joint authorship to several papers that came out of these discussions but my part was more that of interested auditor.” One of these joint papers with Nesbitt “On the modular characters of groups”  appeared in 1941 and remained for many years the only readily available reference for modular theory. An essential part of this theory was a new general representation theory of algebras, initiated by Brauer and developed by him, Nesbitt and Nakayama during this period. Brauer's teaching contribution to mathematics at Toronto was considerable; his lectures and seminars were well-attended, and he had several Ph.D. students apart from Nesbitt, including R. H. Bruck, S. A. Jennings, N. S. Mendelsohn, R. G. Stanton and R. Steinberg. Brauer was elected to the Royal Society of Canada in 1945. With his Toronto colleagues H. S. M. Coxeter and G. de B. Robinson he was involved in
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Biographical Memoirs: VOLUME 75 the Canadian Mathematical Congress and the founding of the Canadian Journal of Mathematics. During his years in Canada he kept up many contacts with the United States; he was visiting professor at the University of Wisconsin in 1941, and a visiting member of the Institute of Advanced Study in 1942. In 1942 he also spent some time with Emil Artin at Bloomington, Indiana. Brauer had met Artin briefly in Hamburg, but this was their first real mathematical and personal contact. Their discussions and correspondence over the ensuing years resulted in Brauer's famous proof  of Artin's L-function conjecture, and a series of subsequent papers relating to class-field theory, for which he received the American Mathematical Society's Cole Prize in 1949. Artin and Brauer were to remain close friends until Artin's death in 1962. By 1948 Brauer was becoming one of the leading figures on the international mathematical scene, and it can have surprised no one when he moved back to the United States in that year, to a chair at the University of Michigan, Ann Arbor. Nesbitt was on the faculty there, but by then had moved into another area of mathematics, and the few graduate courses in algebra were being taught by R. M. Thrall, who already had considerable contact with the work of Artin, Brauer and Nakayama. Brauer at once set about enlarging the graduate programme in algebra and number theory, and he took on a big personal load of advanced lectures, seminars and Ph.D. supervision. There was no National Science Foundation to support research in those days, but many of the best international researchers were prepared to lecture at summer schools in the United States. Michigan had always had a particularly good and well-attended summer programme in mathematics, which was now enhanced by the attraction of Brauer. When Brauer was not involved in such an Ann Arbor summer, he and Ilse would
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Biographical Memoirs: VOLUME 75 take vacations at Estes Park, Colorado, where there were usually other algebraists present—for example Reinhold Baer, a former school-fellow of Brauer's in Berlin, and now at the University of Illinois at Urbana. Michigan became one of the liveliest centres of algebra, with a remarkable young generation—Ph.D, students of Brauer's included K. A. Fowler, W. Jenner and D. J. Lewis; and W. Feit, J. P. Jans and J. Walter were students while Brauer was at Michigan, although they did not take their doctorates with him. A. Rosenberg was a post-doctoral fellow at Michigan during this time, and the junior faculty included M. Auslander and J. McLaughlin. About 1951 Brauer, together with his pupil K. A. Fowler, found the first group-theoretical characterization of the simple groups LF(2, q) (q = 4). At nearly the same time, M. Suzuki in Japan had proved a similar theorem for the case q = p (prime), and later introduced important simplifications in the proof of the general case with his method of “exceptional characters”. G. E. Wall, who was then at Manchester, had also arrived at Brauer's theorem independently by about 1953. The final version, a joint paper by Brauer, Suzuki and Wall , did not appear until 1959. This work, together with Brauer and Fowler's paper “On groups of even order” , marked the beginnning of a new advance in the theory of finite groups. A few years later W. Feit and J. Thompson made another breakthrough with their long proof (Feit, Thompson 1963) of the old conjecture of Burnside that every non-Abelian finite simple group has even order. Most of the great progress in the understanding and classification of finite simple groups, which has dominated algebra in the past 25 years, can be traced to these pioneering achievements. Brauer was to remain a leading contributor to this progress. The Brauers were very happy at Ann Arbor, and expected to stay there for the rest of their lives. However in 1951
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Biographical Memoirs: VOLUME 75 brick, stone by stone.” Many people have expressed the hope that some of Brauer's lecture courses might eventually be published. It is not possible to separate Richard Brauer's mathematical qualities from his personal qualities. All who knew him best were impressed by his capacity for wise and independent judgment, his stable temperament and his patience and determination in overcoming obstacles. He was the most unpretentious and modest of men, and remarkably free of self-importance. He was embarrassed to find his name attached adjectivally to some of his discoveries, and rebuked a student, gently but seriously, for referring to “Brauer algebra classes” in the theory of simple algebras–this was at Harvard, and the offending terminology had been standard for at least twenty years! Brauer's interest in people was natural and unforced, and he treated students and colleagues alike with the same warm friendliness. In mathematical conversations, which he enjoyed, he was usually the listener. If his advice was sought, he took this as a serious responsibility, and would work hard to reach a wise and objective decision. Richard Brauer occupied an honored position in the mathematical community, in which the respect due to a great mathematician was only one part. He was honored as much by those who knew him for his deep humanity, understanding and humility; these were the attributes of a great man. HONORS AND HONORARY POSTS HELD BY RICHARD BRAUER Elected memberships of learned societies Royal Society of Canada 1945 American Academy of Arts and Sciences 1954 National Academy of Sciences 1955 London Mathematical Society (Honorary Member) 1963
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Biographical Memoirs: VOLUME 75 Akademie der Wissenschaften Göttingen (Corresponding Member) 1964 American Philosophical Society 1974 PRIZES, ETC. Guggenheim Memorial Fellowship 1941-42 Cole Prize (American Mathematical Society) 1949 National Medal for Scientific Merit 1971 HONORARY DOCTORATES University of Waterloo, Ontario 1968 University of Chicago 1969 University of Notre Dame, Indiana 1974 Brandeis University, Massachusetts 1975 PRESIDENCIES OF MATHEMATICAL SOCIETIES Canadian Mathematical Congress 1957-58 American Mathematical Society 1959-60 EDITORSHIPS OF LEARNED JOURNALS Transactions of the Canadian Mathematical Congress 1943-49 American Journal of Mathematics 1944-50 Canadian Journal of Mathematics 1949-59 Duke Mathematical Journal 1951-56, 1963-69 Annals of Mathematics 1953-60 Proceedings of the Canadian Mathematical Congress 1954-57 Journal of Algebra 1964-70
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Biographical Memoirs: VOLUME 75 REFERENCES L. Bieberbach, Theorie der Differentialgleichungen ( Springer Berlin, 1923). L. E. Dickson, “On the group defined for any given field by the multiplication table of any given finite group”, Trans. Amer. Math. Soc., 3 (1902), 285-301. L. E. Dickson, “Modular theory of group-matrices”, Trans. Amer. Math. Soc., 8 (1907), 389-398. L. E. Dickson, “Modular theory of group characters”, Bull. Amer. Math. Soc., 13 (1907), 477-488. W. Feit and J. G. Thompson, “Solvability of groups of odd order”, Pacific J. Math., 13 (1963), 755-1029. G. Pólya and G. Szegö, Aufgaben und Lehrsätze aus der Analysis, Band 2 (Springer, Berlin, 1925). L. Pontrjagin, “Sur les nombres de Betti des groupes de Lie”, C. R. Acad. Sci. Paris, 200 (1935), 1277-1280. I. Schur, “Neue Anwendungen der Integralrechnung auf Probleme der Invariantentheorie” Sitz. Preuss. Akad. Wiss. Berlin ( 1924), I.189-208, II.297-321, III.346-355. H. Weyl, The classical groups, their invariants and representations (Princeton University Press, Princeton, New Jersey 1939; 2nd Ed. 1946).
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Biographical Memoirs: VOLUME 75 BIBLIOGRAPHY OF RICHARD BRAUER 1. “Über die Darstellung der Drehungsgruppe durch Gruppen linearer Substitutionen” Inaugural-Dissertation zur Erlangung der Doktorwürde, Friedrich-Wilhelms-Universität, Berlin. 71 pages. 2. “Über die Irreduzibilität einiger spezieller Klassen von Polynomen” (with A. Brauer and H. Hopf).Jber. Deutsch. Math.-Verein., 35 (1926), 99-112. 3. “Über Zusammenhänge zwischen arithmetischen und invariantentheoretischen Eigenschaften von Gruppen linearer Substitutionen”, Sitz. Preuss. Akad. Wiss., ( 1926), 410-416. 4. “Über minimale Zerfällungskörper irreduzibler Darstellungen” (with E. Noether). Sitz. Preuss. Akad. Wiss., ( 1927), 221-228. 5. “Untersuchungen über die arithmetischen Eigenschaften von Gruppen linearer Substitutionen I”, Math. Z., 28 (1928), 677-696. 6. “Über einen Satz für unitäre Matrizen”, Tôhoku Math. J., 30 (1928), 72. 7. “Über Systeme hyperkomplexer Zahlen”, Math. Z., 30 (1929), 79-107. 8. “Die stetigen Darstellungen der komplexen orthogonalen Gruppe”, Sitz. Preuss. Akad. Wiss., ( 1929), 626-638. 9. “Über einen Satz für unitäre Matrizen” (with A. Loewy), Tôhoku Math. J., 32 (1930), 44-49. 10. “Über Systeme hyperkomplexer Grossen”, Jber. Deutsch. Math.-Verein., 38 (1929), 47-48. 11. “Zum Irreduzibilitätsbegriff in der Theorie der Gruppen linearer homogener Substitutionen” (with I. Schur). Sitz. Preuss. Akad. Wiss., ( 1930), 209-226. 12. “Untersuchungen über die arithmetischen Eigenschaften von Gruppen linearer Substitutionen II”, Math. Z., 31 (1930), 733-747. 13. “Über die algebraische Struktur von Schiefkörpern”, J. reine angew. Math., 166 (1932), 241-252. 14. “Beweis eines Hauptsatzes in der Theorie der Algebren” (with H. Hasse and E. Noether), J. reine angew. Math., 167 (1931), 399-404. 15. “Über die Konstruktion der Schiefkörper, die von endlichem
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Biographical Memoirs: VOLUME 75 Rang in bezug auf ein gegebenes Zentrum sind”, J. reine angew. Math., 168 (1932), 44-64. 16. “Über den Index und den Exponenten von Divisionalgebren”, Tôhoku Math. J., 37 (1933), 77-87. 17. “Über die Kleinsche Theorie der algebraischen Gleichungen”, Math. Ann., 110 (1934), 473-500. 18. “Über die Darstellung von Gruppen in Galoisschen Feldern”, Actualités Sci. Indust. no. 195, ( 1935). 15 pages. 19. “Spinors in n dimensions” (with H. Weyl), Amer. J. Math., 57 (1935), 425-449. 20. “Über Irreduzibilitätskriterien von I. Schur and G. Pólya” (with A. Brauer), Math. Z., 40 (1935), 242-265. 21. “Sur les invariants intégraux des variétés représentatives des groupes de Lie simples clos”, C. R. Acad. Sci. Paris, 201 (1935), 419-421. 22. “Algebra der hyperkomplexen Zahlensysteme (Algebren)”, accepted for publication ( 1936) in Enzyklopädie der Mathematischen Wissenschaftenvol. IB 8, B. G. Teubner, Leipzig. About 50 pages. (Not published because of political considerations.) 23. “Symmetrische Funktionen. Invarianten von linearer Gruppen endlicher Ordnung”, accepted for publication ( 1936) in Enzyklopädie der Mathematischen Wissenschaftenvol. IB 8, B. G. Teubner, Leipzig. About 50 pages. (Not published because of political considerations.) 24. “A characterization of null systems in projective space”, Bull. Amer. Math. Soc., 42 (1936), 247-254. 25. “On algebras which are connected with the semisimple continuous groups” Ann. of Math., 38 (1937), 857-872. 26. “Eine Bedingung für vollständige Reduzibilität von Darstellungen gewöhnlicher und infinitesimaler Gruppen”, Math. Z., 41 (1936), 330-339. 27. “On the modular representations of groups of finite order I”, (with C. Nesbitt), Univ. Toronto Studies no. 4 (1937), 21 pages. 28. “On the regular representations of algebras”, (with C. Nesbitt), Proc. Nat. Acad. Sci. U.S.A., 23 (1937), 236-240. 29. “Sur la multiplication des caractéristiques des groupes continus et semi-simples”, C. R. Acad. Sci. Paris, 204 (1937), 1784-1786.
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Biographical Memoirs: VOLUME 75 30. “On normal division algebras of index 5”, Proc. Nat. Acad. Sci. U.S.A., 24 (1938), 243-246. 31. “On modular and p-adic representations of algebras”, Proc. Nat. Acad. Sci. U.S.A., 25 (1939), 252-258. 32. “On the representation of groups of finite order”, Proc. Nat. Acad. Sci. U.S.A., 25 (1939), 290-295. 33. “On the Cartan invariants of groups of finite order”, Ann. of Math., 42 (1941), 53-61. 34. “On the modular characters of groups” (with C. Nesbitt), Ann. of Math., 42 (1941), 556-590. 35. “A generalization of theorems of Schönhardt and Mehmke on polytopes” (with H. S. M. Coxeter), Trans. Roy. Soc. CanadaIII (3), 34 (1940), 29-34. 36. “On sets of matrices with coefficients in a division ring”, Trans Amer. Math. Soc., 49 (1941), 502-548. 37. “On the connection between the ordinary and the modular characters of groups of finite order”, Ann. of Math., 42 (1941), 926-935. 38. “Investigations on group characters”, Ann. of Math., 42 (1941), 936-958. 39. “On groups whose order contains a prime number to the first power I”, Amer. J. Math., 64 (1942), 401-420. 40. “On groups whose order contains a prime number to the first power II”, Amer. J. Math., 64 (1942), 421-440. 41. “On the nilpotency of the radical of a ring”, Bull. Amer. Math. Soc., 48 (1942), 752-758. 42. “On permutation groups of prime degree and related classes of groups” Ann. of Math., 44 (1943), 57-79. 43. “On the arithmetic in a group ring”, Proc. Nat. Acad. Sci. U.S.A., 30 (1944), 109-114. 44. “On hypercomplex arithmetic and a theorem of Speiser”, Festschrift for 60th birthday of Andreas Speiser ( Zurich, 1945). 13 pages. 45. “A note on systems of homogeneous algebraic equations”, Bull. Amer. Math. Soc., 51 (1945), 749-755. 46. “On simple groups of finite order” (with H. F. Tuan), Bull. Amer. Math. Soc., 51 (1945), 756-766. 47. “On the representation of a group of order g in the field of the g-th roots of unity”, Amer. J. Math., 67 (1945), 461-471.
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Biographical Memoirs: VOLUME 75 48. “On blocks of characters of groups of finite order, I”, Proc. Nat. Acad. Sci. U.S.A., 32 (1946), 182-186. 49. “On blocks of characters of groups of finite order, II”, Proc. Nat. Acad. Sci. U.S.A., 32 (1946), 215-219. 50. “On splitting fields of simple algebras”, Ann. of Math., 48 (1947), 79-90. 51. “On Artin's L-series with general group characters”, Ann. of Math., 48 (1947), 502-514. 52. “On the zeta-functions of algebraic number fields”, Amer. J. Math., 69 (1947), 243-250. 53. “Applications of induced characters”, Amer. J. Math., 69 (1947), 709-716. 54. “On a conjecture by Nakayama”, Trans. Roy. Soc. CanadaIII (3), 41 (1947), 11-19. 55. “A note on Hilbert's Nullstellensatz”, Bull. Amer. Math. Soc., 54 (1948), 894-896. 56. “Representations of groups and rings”, Amer. Math. Soc. Colloquium lectures, (1948), 22 pages. 57. “On a theorem of H. Cartan”, Bull. Amer. Math. Soc., 55 (1949), 619-620. 58. “On the zeta-functions of algebraic number fields II”, Amer. J. Math., 72 (1950), 739-746. 59. “Beziehungen zwischen Klassenzahlen von Teilkörpern eines galoisschen Körpers”, Math. Nachr., 4 (1951), 158-174. 60. “On the algebraic structure of group rings”, J. Math. Soc. Japan, 3 (1951), 237-251. 61. “On the representations of groups of finite order”, Proc. Internat. Cong. Math., (1950), vol. II, 33-36. 62. “A characterization of the characters of groups of finite order”, Ann. of Math., 57 (1953), 357-377. 63. “On the characters of finite groups” (with J. Tate), Ann. of Math., 62 (1955), 1-7. 64. “On groups of even order” (with K. A. Fowler), Ann. of Math.62 (1955), 565-583. 65. “Zur Darstellungstheorie der Gruppen endlicher Ordnung”, Math. Z., 63 (1956), 406-444. 66. “A note on the class-numbers of algebraic number fields” (with N. C. Ankeny and S. Chowla), Amer. J. Math., 78 (1956), 51-61.
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Biographical Memoirs: VOLUME 75 67. “Number-theoretical investigations on groups of finite order”, Proc. Internat. Symp. on Alg. Number Theory ( Tokyo-Nikko, 1955), 55-62. 68. “On the structure of groups of finite order”, Proc. Internat. Cong. Math. ( 1954), Vol. I.209-217. 69. “Some remarks on associative rings and algebras”, >Nat. Acad. Sci., Nat. Res. Coun. Publication 502, “Linear Algebras” ( 1957), 4-11. 70. “A characterization of the one-dimensional unimodular projective groups over finite fields” (with M. Suzuki and G. E. Wall), Illinois. J. Math., 2 (1958), 718-745. 71. “On a problem of E. Artin” (with W. F. Reynolds), Ann. of Math., 68 (1958), 713-720. 72. “On the number of irreducible characters of finite groups in a given block” (with W. Feit), Proc. Nat. Acad. Sci. U.S.A., 45 (1959), 361-365. 73. “Zur Darstellungstheorie der Gruppen endlicher Ordnung II”, Math. Z., 72 (1959), 25-46. 74. “On finite groups of even order whose 2-Sylow group is a quaternion group” (with M. Suzuki), Proc. Nat. Acad. Sci. U.S.A., 45 (1959), 1757-1759. 75. “Les groupes d'ordre fini et leurs caractères”, Sém. P. Dubreil, M.-L. Dubreil-Jacotin et C. Pisot ( Paris, 1959), 6-01 to 6-16. 76. “On blocks of representations of finite groups”, Proc. Nat. Acad. Sci. U.S.A., 47 (1961), 1888-1890. 77. “Investigation on groups of even order, I”, Proc. Nat. Acad. Sci. U.S.A., 47 (1961), 1891-1893. 78. “On finite groups with an abelian Sylow group” (with H. S. Leonard), Canad. J. Math., 14 (1962), 436-450. 79. “On groups of even order with an abelian 2-Sylow subgroup”, Arch. Math., 13 (1962), 55-60. 80. “On some conjectures concerning finite simple groups”, Studies in Math. Analysis and Related Topics ( Stanford, 1962), 56-61. 81. “On finite groups and their characters”, Bull. Amer. Math. Soc., 69 (1963), 125-130. 82. “Representations of finite groups”, Lectures on Modern Math. Vol. I ( Wiley, 1963), 133-175.
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Biographical Memoirs: VOLUME 75 83. “On quotient groups of finite groups”, Math. Z., 83 (1964), 72-84. 84. “A note on theorems of Burnside and Blichfeldt”, Proc. Amer. Math. Soc.15 (1964), 31-34. 85. “Some applications of the theory of blocks of characters of finite groups I”, J. Algebra, 1 (1964), 152-167. 86. “Some applications of the theory of blocks of characters of finite groups II”,J. Algebra, 1 (1964), 307-334. 87. “On certain classes of positive definite quadratic forms”, Acta Arith., 9 (1964), 357-364. 88. “On the relation between the orthogonal group and the unimodular group”, Arch. Rational Mech. Anal., 18 (1965), 97-99. 89. “On finite desarguesian planes I”, Math. Z.90 (1965), 117-123. 90. “On finite desarguesian planes II”, Math. Z., 91 (1966), 124-151. 91. “Investigation on groups of even order II”, Proc. Nat. Acad. Sci. U.S.A., 55 (1966), 254-259. 92. “Some applications of the theory of blocks of characters of finite groups III”, J. Algebra, 3 (1966), 225-255. 93. “A characterization of the Mathieu group M12” (with P. Fong), Trans. Amer. Math. Soc., 122 (1966), 18-47. 94. “An analogue of Jordan's theorem in characteristic p” (with W. Feit), Ann. of Math., 84 (1966), 119-131. 95. “Some results on finite groups whose order contains a prime to the first power”, Nagoya Math. J.27 (1966), 381-399. 96. “Emil Artin, Bull. Amer. Math. Soc., 73 (1967), 27-43. 97. “On simple groups of order 5 ·A 3a · 2b” (Mimeographed notes, Harvard Univ., 1967), 49 pages. 98. “Über endliche lineare Gruppen von Primzahlgrad”, Math. Ann., 169 (1967), 73-96. 99. “On a theorem of Burnside”, Illinois J. Math., 11 (1967), 349-352. 100. “On blocks and sections in finite groups I”, Amer. J. Math., 89 (1967), 1115-1136. 101. “On pseudo groups”, J. Math. Soc. Japan, 20 (1968), 13-22. 102. “On blocks and sections in finite groups II”, Amer. J. Math., 90 (1968), 895-925.
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Biographical Memoirs: VOLUME 75 103. “On simple groups of order 5 · 3a.2b”, Bull. Amer. Math. Soc., 74 (1968), 900-903. 104. “On a theorem of Frobenius”, Amer. Math. Monthly, 76 (1969), 12-15. 105. “Defect groups in the theory of representations of finite groups” Illinois J. Math., 13 (1969), 53-73. 106. “On the order of finite projective groups in a given dimension”, Nachr. Akad. Wiss. Göttingen,11 (1969), 103-106. 107. “On the representations of finite groups”, Yeshiva Univ. ( 1969), 121-128. 108. “On groups with quasi-dihedral Sylow 2-subgroups II”, Theory of Finite Groups, a symposium Benjamin, 1969), 13-19. 109. “On the first main theorem on blocks of characters of finite groups” Illinois J. Math., 14 (1970), 183-187. 110. “Finite groups with quasi-dihedral and wreathed Sylow 2-subgroups” (with J. L. Alperin and D. Gorenstein), Trans. Amer. Math. Soc., 151 (1970), 1-261. 111. “On finite desarguesian planes III”, Math. Z., 117 (1970), 76-82. 112. “Some applications of the theory of blocks of characters of finite groups IV”, J. Algebra, 17 (1971), 489-521. 113. “Types of blocks of representations of finite groups”, Proc. Symp. in Pure Math. vol. 21, Amer. Math. Soc. ( 1971), 7-11. 114. “Some properties of finite groups with wreathed Sylow 2-subgroup” (with W. J. Wong), J. Algebra, 19 (1971), 263-273. 115. “Character theory of finite groups with wreathed Sylow 2-subgroups” J. Algebra, 19 (1971), 547-592. 116. “Blocks of characters”, Proc. Internat. Cong. Math., (1970), Vol. 1, 341-345. 117. “On the work of John Thompson”, Proc. Internat. Cong. Math.(1970), Vol. 1, 15-16. 118. “Finite simple groups of 2-rank two” (with J. L. Alperin and D. Gorenstein), Scripta Math., 29 (1973), 191-214. 119. “A note on zeta-functions of algebraic number fields”, Acta Arith., 24 (1973), 325-327. 120. “On the structure of blocks of characters of finite groups”, Proc. Second Internat. Conf. Theory of Groups ( Canberra, 1973), 103-130.
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Biographical Memoirs: VOLUME 75 121. “Some applications of the theory of blocks of characters of finite groups V”, J. Algebra, 28 (1974), 433-460. 122. “On 2-blocks with dihedral defect groups”, Symposia Math. (INDAM), 13 (1974), 367-393. 123. “On the centralizers of p-elements in finite groups” (with P. Fong), Bull. London Math. Soc.6 (1974), 319-324. 124. “On the resolvent problem”, Ann. Mat. Pura Appl., 102 (1975), 45-55. 125. “On finite groups with cyclic Sylow subgroups I”, J. Algebra40 (1976), 556-584. 126. “Notes on representations of finite groups I”, J. London Math. Soc. (2), 13 (1976), 162-166. 127. “Blocks of characters and structure of finite groups”, Bull. Amer. Math. Soc., (new series)1 (1979), 21-38. 128. “On finite projective groups”, from Contributions to Algebra (Academic press, 1977).
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