Richard Brauer
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Richard Brauer  

Richard and Ilse Brauer in 1970
Photo courtesy MFO 

Born  February 10, 1901 Charlottenburg, German Empire 
Died  April 17, 1977 Belmont, Massachusetts, U.S. 
Residence  Germany, U.S. 
Nationality  German, U.S. 
Fields  Scientist, mathematician 
Institutions  University of Toronto, University of Michigan, Harvard University 
Alma mater  University of Berlin 
Doctoral advisor  Issai Schur Erhard Schmidt 
Doctoral students  R. H. Bruck S. A. Jennings Peter Landrock D. J. Lewis J. Carson Mark Cecil J. Nesbitt Robert Steinberg 
Known for  Brauer's theorem on induced characters 
Notable awards  Cole Prize in Algebra (1949) National Medal of Science (1970) 
Richard Dagobert Brauer (February 10, 1901 – April 17, 1977) was a leading German and American mathematician. He worked mainly in abstract algebra, but made important contributions to number theory. He was the founder of modular representation theory.
Contents
Education and career
Alfred Brauer was Richard's brother and seven years older. Alfred and Richard were both interested in science and mathematics, but Alfred was injured in combat in World War I. As a boy, Richard dreamt of becoming an inventor, and in February 1919 enrolled in Technische Hochschule BerlinCharlottenburg. He soon transferred to University of Berlin. Except for the summer of 1920 when he studied at University of Freiburg, he studied in Berlin, being awarded his doctorate 16 March 1926. Issai Schur conducted a seminar and posed a problem in 1921 that Alfred and Richard worked on together, and published a result. The problem also was solved by Heinz Hopf at the same time. Richard wrote his thesis under Schur, providing an algebraic approach to irreducible, continuous, finitedimensional representations of real orthogonal (rotation) groups.
Ilse Karger also studied mathematics at the University of Berlin; she and Richard were married 17 September 1925. Their boys George Ulrich (b 1927) and Fred Gunther (b 1932) also became mathematicians. Brauer began his teaching career in Königsberg (now Kaliningrad) working as Konrad Knopp’s assistant. Brauer expounded central division algebras over a perfect field while in Königsberg; the isomorphism classes of such algebras form the elements of the Brauer group he introduced.
When the Nazi Party took over in 1933, the Emergency Committee in Aid of Displaced Foreign Scholars took action to help Brauer and other Jewish scientists.^{[1]} Brauer was offered an assistant professorship at University of Kentucky. Richard accepted the offer, and by the end of 1933 he was in Lexington, Kentucky, teaching in English.^{[1]} Ilse followed the next year with George and Fred; brother Alfred made it to the USA in 1939, but their sister Alice was killed in The Holocaust.^{[1]}
Hermann Weyl invited Richard to assist him at Princeton's Institute for Advanced Study in 1934. Richard and Nathan Jacobson edited Weyl's lectures Structure and Representation of Continuous Groups. Through the influence of Emmy Noether, Richard was invited to University of Toronto to take up a faculty position. With his graduate student Cecil J. Nesbitt he developed modular representation theory, published in 1937. Robert Steinberg, and Stephen Arthur Jennings were also Brauer’s students in Toronto. Brauer also conducted international research with Tadasi Nakayama on representations of algebras. In 1941 University of Wisconsin hosted visiting professor Brauer. The following year he visited the Institute for Advanced Study and Bloomington, Indiana where Emil Artin was teaching.
In 1948 Richard and Ilse moved to Ann Arbor, Michigan where he and Robert M. Thrall contributed to the program in modern algebra at University of Michigan. With his graduate student K. A. Fowler, Brauer proved the BrauerFowler theorem. Donald John Lewis was another of his students at UM.
In 1952 Brauer joined the faculty of Harvard University. Before retiring in 1971 he taught aspiring mathematicians such as Donald Passman and I. Martin Isaacs. The Brauers frequently traveled to see their friends such as Reinhold Baer, Werner Wolfgang Rogosinski, and Carl Ludwig Siegel.
Mathematical work
Several theorems bear his name, including Brauer's induction theorem, which has applications in number theory as well as finite group theory, and its corollary Brauer's characterization of characters, which is central to the theory of group characters.
The Brauer–Fowler theorem, published in 1956, later provided significant impetus towards the classification of finite simple groups, for it implied that there could only be finitely many finite simple groups for which the centralizer of an involution (element of order 2) had a specified structure.
Brauer applied modular representation theory to obtain subtle information about group characters, particularly via his three main theorems. These methods were particularly useful in the classification of finite simple groups with low rank Sylow 2subgroups. The Brauer–Suzuki theorem showed that no finite simple group could have a generalized quaternion Sylow 2subgroup, and the Alperin–Brauer–Gorenstein theorem classified finite groups with wreathed or quasidihedral Sylow 2subgroups. The methods developed by Brauer were also instrumental in contributions by others to the classification program: for example, the Gorenstein–Walter theorem, classifying finite groups with a dihedral Sylow 2subgroup, and Glauberman's Z* theorem. The theory of a block with a cyclic defect group, first worked out by Brauer in the case when the principal block has defect group of order p, and later worked out in full generality by E. C. Dade, also had several applications to group theory, for example to finite groups of matrices over the complex numbers in small dimension. The Brauer tree is a combinatorial object associated to a block with cyclic defect group which encodes much information about the structure of the block.
In 1970, he was awarded the National Medal of Science.^{[2]}
Hypercomplex numbers
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Eduard Study had written an article on hypercomplex numbers for Klein's encyclopedia in 1898. This article was expanded for the French language edition by Henri Cartan in 1908. By the 1930s there was evident need to update Study’s article, and Richard Brauer was commissioned to write on the topic for the project. As it turned out, when Brauer had his manuscript prepared in Toronto in 1936, though it was accepted for publication, politics and war intervened. Nevertheless, Brauer kept his manuscript through the 40s, 50s, and 60s, and in 1979 it was published^{[3]} by Okayama University in Japan. It also appeared posthumously as paper #22 in the first volume of his Collected Papers. His title was "Algebra der hyperkomplexen Zahlensysteme (Algebren)". Unlike the articles by Study and Cartan, which were exploratory, Brauer’s article reads as a modern abstract algebra text with its universal coverage. Consider his introduction:
 In the beginning of the 19th century, the usual complex numbers and their introduction through computations with numberpairs or points in the plane, became a general tool of mathematicians. Naturally the question arose whether or not a similar "hypercomplex" number can be defined using points of ndimensional space. As it turns out, such extension of the system of real numbers requires the concession of some of the usual axioms (Weierstrass 1863). The selection of rules of computation, which cannot be avoided in hypercomplex numbers, naturally allows some choice. Yet in any cases set out, the resulting number systems allow a unique theory with regard to their structural properties and their classification. Further, one desires that these theories stand in close connection with other areas of mathematics, wherewith the possibility of their applications is given.
While still in Königsberg in 1929, Brauer published an article in Mathematische Zeitschrift "Über Systeme hyperkomplexer Zahlen"^{[4]} which was primarily concerned with integral domains (Nullteilerfrei systeme) and the field theory which he used later in Toronto.
See also
 Brauer algebra
 Brauer group, the equivalence classes of brauer algebras over the same field F equipped with a group operation
 Brauer–Cartan–Hua theorem
 Brauer–Nesbitt theorem
 Brauer–Manin obstruction
 Brauer–Siegel theorem
 Brauer–Suzuki theorem
 Brauer's theorem
 Brauer's theorem on induced characters
 Brauer characters
Publications
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References
 ↑ ^{1.0} ^{1.1} ^{1.2} Bergmann, Birgit; Epple, Moritz; and Ungar, Ruti. Transcending Tradition: Jewish Mathematicians in German Speaking Academic Culture, p. 54. Springer, 2012. ISBN 3642224636. Accessed February 25, 2013. "Schur's disciple Alfred Brauer was the last Jewish mathematician who managed to complete his habilitation and become Privatdozent at the University of Berlin before the Nazi regime began. Brauer escaped to the USA in 1939, joining his brother Richard (19011977) who had fled in 1933."
 ↑ National Science Foundation The President's National Medal of Science
 ↑ Mathematical Journal of Okayama University 21:53–89
 ↑ Mathematische Zeitschrift 30:79–107, paper #7 in Collected Papers
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 Charles W. Curtis (2003) "Richard Brauer: Sketches from His Life and Work", American Mathematical Monthly 110:665–77.
 James Alexander Green (1978) "Richard Dagobert Brauer", Bulletin of the London Mathematical Society 10:317–42.
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External links
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 Richard Brauer at the Mathematics Genealogy Project
 National Academy of Sciences Biographical Memoir