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Bernhard Hermann Neumann 1909–2002 CSIRO PUBLISHING www.publish.csiro.au/journals/hras Historical Records of Australian Science, 2010, 21, 253–282 Bernhard Hermann Neumann 1909–2002 Cheryl E. Praeger School of Mathematics and Statistics, University of Western Australia, WA 6009, Australia. Email: [email protected] Bernhard Hermann Neumann was born and educated in Berlin. He held doctorates from Berlin and Cam- bridge, and mathematical positions at universities in Cardiff, Hull, Manchester, and the Australian National University (ANU) in Canberra. Whereas his move to the UK in 1933 was a result of the difficulties he faced as a Jew in finding employment in Germany, his move to Australia in 1962 was to set up a new research Department of Mathematics at the Institute of Advanced Studies at the ANU. Bernhard Neumann was famous for both his seminal research work in algebra and his strong support of all endeavours in mathematics. His scholarly publications span more than seventy years. His honours include Fellowship of the Royal Society and of the Australian Academy of Science, appointment as Companion of the Order of Australia, and numerous honorary doctorates. To Bernhard it was important to share and spread the joy of doing mathematics. Bernhard Hermann Neumann was born Early Life and Education in Berlin, Germany, on 15 October 1909. Bernhard was named after his two grand- After completing his doctorate in Berlin, fathers. His paternal grandfather Bernhard he moved to the UK to seek employment, Neumann was a hardware merchant in Karl- and undertook a second doctorate in Cam- sruhe in the south of Germany, and Bern- bridge. His academic work as a mathe- hard’s father Richard was the youngest matician in the UK was interrupted by a of four children, born on 15 January period of internment, and then service in 1876. Bernhard’smaternal grandfather Her- the British army, during the Second World mann Aronstein had a large farm, called War. Bernhard Neumann was head-hunted a Rittergut, in Westphalia, and Bernhard’s from his position in Manchester to become, mother Else was Hermann’s third daughter. in 1962, foundation professor and head of Both sides of Bernhard Neumann’s family a new research mathematics department were thus solidly middle-class. at the Australian National University. He Richard Neumann married Else in 1905 had an enormous positive influence on the in Berlin. He studied engineering, spent two development of mathematics in Australia years in the USA as an engineer and then and the Asia-Pacific region, not only during held a job until the late 1930s in Berlin, his time as departmental head at the ANU in the AEG—Allgemeine Elektrizitätsge- but also in the decades following his retire- sellschaft. Bernhard was the second child ment in 1975. Bernhard died suddenly on and only son. His elder sister Edel-Agathe 21 October 2002, in Canberra, Australia, (known as Eta) was born in 1906 in Berlin, shortly after his 93rd birthday. He is sur- studied physics in Berlin, worked in patent vived by his second wife Dorothea and the law and patent physics in north-east Eng- five children of his first marriage (to Hanna, land until she married Gösta Lindskog, a also a mathematician and a Fellow of the Swedish pastor and school teacher, and then Australian Academy of Science at the time lived in Sweden with Gösta until her death of her death in 1971). from cancer in 1958. Both of Bernhard’s © Australian Academy of Science 2010 10.1071/HR09021 0727-3061/10/020253 254 Historical Records of Australian Science, Volume 21 Number 2 Bernhard Hermann Neumann 1909–2002 255 parents were Jewish. Richard was not prac- Professor of Mathematics at the University tising, while Else went to synagogue for the of California, Berkeley.Throughout his life, important festivals. Bernhard was also not Bernhard made friends quickly and easily, practising, but despite this he and his first and kept in contact with a large number wife Hanna sat on the Council of Jews and of people. His remarkable memory was no Christians in their Manchester days in the doubt aided by his famous pocket diary late 1950s, wishing to bring reconciliation in which he recorded birthdays and other between the two religions. significant details. Bernhard was four years old when Bernhard left the Herderschule with the the First World War began. The blockade Abitur, the qualification that was an enti- against Germany caused severe shortages tlement to university entrance. His univer- and strict rationing, and Bernhard remem- sity education began with two semesters bered feeling very hungry for much of the at Freiburg University in 1928–29, study- war. Thus he knew privation of a type not ing under Alfred Loewy, Gustav Mie often met with in Europe today. Bernhard and Lothar Heffter. Heffter, Bernhard’s remembered with some affection the arrival favourite teacher, was mathematically of Quakers immediately after the war; they active until his 100th year. Bernhard ded- went around schools in Germany feeding icated his paper B68 for Heffter’s 100th the children. birthday. However on submitting the paper Bernhard attended the Herderschule in Bernhard learned from the editor ‘by return’ Berlin-Charlottenburg from 1916 to 1928. that Heffter had just died, less than six He claims that he was dull as a young months before his 100th birthday (B120, child to the extent that an aunt consoled p. 587). So the paper is dedicated to his his mother with the words, ‘he might yet memory. Bernhard was always keenly inter- make an artisan of sorts!!’1 A tonsillec- ested in people who continued to be very tomy that happened at about the time he active academically after retirement, and entered the Herderschule changed this per- later loved the fact that his own life was so ception. From then on he took delight in long. When a mutual friend died, Bernhard sums and particularly mental arithmetic. is reported as saying, ‘but he was only 85, Bernhard’s father had a student text on cal- wasn’t he?’ The other side of the coin was culus that fascinated him. He did all the that he became one of the great supporters exercises and thus learned differential cal- of the young, as we see later. culus (then a university subject) at a very After the Freiburg experience, Bern- early age, and loved studying the beautiful hard returned home to Berlin to study at curves contained in the book. Later, in Year the Friedrich-Wilhelms-Universität, later to 10 of school, he invented three-dimensional become the Humboldt University. He was analytic geometry for himself. delighted to have a degree from both incar- At school, FelixW.Behrend taught Bern- nations of the institution, the doctorate from hard mathematics and physics. His teacher’s Humboldt being an honorary one. Bernhard son Felix A. Behrend, a life-long friend of studied under such luminaries as Erhard Bernhard, became an Associate Professor Schmidt, Issai Schur, Robert Remak and of Mathematics at the University of Mel- Heinz Hopf. He began with pure mathe- bourne (see B73). The Herderschule also matics, physics and philosophy. Later he produced G. P. Hochschild, later to become concentrated on pure mathematics. Bernhard was introduced to group the- 1 Much of the material for this part of the memoir has been drawn from the record of interview [1] and the ory in the autumn semester of the academic essays written by Bernhard in the Selected Works of year 1930–31 by Remak, who had given a B. H. Neumann and Hanna Neumann B120. course on his own (then unpublished) work 256 Historical Records of Australian Science, Volume 21 Number 2 on direct products of groups. Apparently Fitzwilliam College), Cambridge, financed the attendance started at thirty and ended at first by his parents in Germany and then up with Bernhard as the single attendee. by an uncle in South Africa. His supervi- Groups were new and exciting to him, sor was Philip Hall and weekly supervision and this excitement never wavered through- sessions took the form of dinner in King’s out his life. He came across the subject College followed by discussion in Hall’s that eventually became part of his Dr.phil. rooms in college, ‘where we would drink his dissertation while attending a seminar on sherry, smoke his cigarettes and talk about geometry and topology led by Hopf and rhizomorphs of plants and political history Georg Feigl. in Germany and everything’. At about ten Bernhard had read a paper of Jakob o’clock the discussion would drift towards Nielsen on automorphisms of free groups mathematics. After completing his PhD in (B120, p. 1); Nielsen had found a finite pre- 1935, Bernhard stayed on in Cambridge for sentation for the automorphism group of a a further two years until he was appointed free group of finite rank. Bernhard discov- in late 1937 as a temporary assistant lec- ered that he could reduce the number of turer in mathematics at University College, generators and relations. Indeed he found Cardiff. He taught in Cardiff until 1940. the minimum generating numbers for free Bernhard had met Hanna von Caem- groups of rank at least 4. He told Hopf, merer in January 1933. Hanna was born in who suggested that the proof should be writ- Berlin on 12 February 1914, the youngest of ten down; and when Hopf saw the resulting three children of Hermann and Katharina manuscript, he suggested that it might be von Caemmerer. Her father had a doctor- used as Bernhard’s doctoral dissertation. ate in history, and was well on the way to Bernhard thought that he was too young and establishing himself as an archivist and aca- the result too slim, but after comings and demic historian when he was killed in the goings involving Hopf, Schur and Schur’s first days of the 1914–18 war.As a result she assistant Alfred Brauer, Schur eventually and her mother, brother Ernst (born 1908) agreed that it was perhaps a little on the and sister Dorothea (Dora, born 1910) lived slim side.
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