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Herbert Busemann COMMUNICATION Herbert Busemann Athanase Papadopoulos Initially, Busemann was not destined for a mathematical career. His father was a very successful business- man who wanted his son to become, like him, a businessman. Thus, the young Her- bert after high school spent two and a half years in business. Several years later, Busemann recalls that he always wanted to study mathematics and describes this pe- riod as “two and a half lost years of my life.”… Herbert Busemann, Selected Works in two volumes by Several years after Herbert Busemann; Athanase he left Göttingen, Herbert Busemann, 1954 Papadopoulos, ed. Busemann shared his Springer, 2018 recollections on the EDITOR’S NOTE. Athanase Papadopoulos has kindly let 908 and 842 pages. teaching he received us publish these excerpts from his introductory ma- there.… terial1 to Herbert Busemann: Selected Works I and II 2. Busemann was deeply involved in fundamental ques- Busemann recounts the following: tions of convexity and is the main founder of metric Officially, I took my degree with Courant. This was only geometry as we intend it today. He was a member of the officially, in the sense that I was really inspired by Paul Royal Danish Academy, a winner of the Lobachevsky Alexandroff, who visited Göttingen regularly. He gave me Medal (1985), president of the California chapter of the the idea of the subject of the thesis. I wrote it, but of course Mathematical Association of America, a member of the he could not be the official reviewer of my thesis, so he council of the American Mathematical Society, and an was my co-referee. [...] I must say that my thesis was partly accomplished linguist and artist. in protest against Courant [...] I went away to Rome. I was angry with Courant, and I wrote my thesis on my own.... In a letter dated August 8, 1930, Courant informs Buse- Athanase Papadopoulos is director of research at the Institute of Advanced Mathematical Research at the University of Stras- mann that his “geometric work” done in Rome is sufficient bourg. His email address is athanase.papadopoulos@math. unistra.fr. 1 For permission to reprint this article, please contact: arXiv:1710.05591v1 (16 Oct 2017) [email protected]. 2Herbert Busemann, Selected Works in two volumes (A. Papado- DOI: http://dx.doi.org/10.1090/noti1651 poulos, ed.), Springer Verlag, 2018. MARCH 2018 NOTICES OF THE AMS 341 COMMUNICATION for a “reasonable” dissertation. The final dissertation was period where “everybody was looking for jobs, and one submitted in December 1930.… had to take whatever.” He says he spent “five miserable The doctoral degree that Busemann obtained in 1931 years” in Chicago, from 1940 to 1945. He adds: would have led him in principle to a position of lecturer, The head of the department made it difficult. but practically it did not. He recounts: He did not like foreigners in the first place. Normally I would become an assistant but He belonged to those people who had done a this was of course the depression time. Since couple of good things when they were quite my father had money and Courant knew it, he young and he was against anyone who was too asked my father whether he wouldn’t support active mathematically. On the other hand the me instead of having me become an assistant. administration forced him to take good people, This would make it possible for some other and he resented them. youngster to become a mathematician. That fact did me a lot of harm later on, in the sense In 1945, Busemann was appointed Assistant Professor that the German government after the Second at Smith College in Northampton. World War tried to make good, but in my case Busemann stayed in contact with Courant, and the they refused, because I had never had a paid two men had a regular correspondence, but essentially position. If I had a paid position I would have on practical matters. Talking about the institute that had a pension. Courant founded later in New York, Busemann says: “In America, Courant tried to do again what he did before in Courant, as the director of the Mathematics Institute Göttingen. …His institute is excellent but very one-sided in Göttingen, told Busemann that they had run over their too. The mathematics represented there goes all, or most funds and asked him to make it possible to meet his father of it, in one direction.” in order to get some financial support from him for the In 1947, Busemann was appointed professor at the institute. The two men met. Busemann says: “How they University of Southern California, and he spent there the settled this situation I don’t know and I thought I shouldn’t rest of his career. In 1964, he was made distinguished ask.” Reid reports on this in her book on Hilbert3 (p. 132): professor. During the increasingly hard times, a number At USC, Busemann worked in relative isolation, and of informal assistantships came into being at practically his only collaborators were his PhD students. the institute in addition to the official ones His work started to be recognized only in the 1980s, when funded by the government. Often duties were metric geometry was revived in the West, especially by vague or non-existent. Courant once gave a stu- M. Gromov, and when the methods of synthetic global dent a stipend because he thought the young geometry were introduced in the study of geodesic metric man was on the verge of a nervous breakdown spaces. W. P. Thurston, in his approach to geometry, also and needed a skiing vacation. He also contrived started from basic principles. Before that, Busemann’s to have some students work without pay. One work was only appreciated in the Soviet Union, where of them was Busemann. A. D. Alexandrov founded an important school on the subject, with a large number of collaborators and stu- Busemann adds, concerning his former advisor: dents. Alexandrov, like Busemann, was only interested in the most basic notions of geometry. Classical problems of Courant was rather reactionary in his math- convexity, isoperimetry, and isoepiphany became the fore- ematical outlook, and so he prevented many front of research, and classical projective geometry took things which should not have been prevented. In Göttingen, he constantly tried to prevent its revenge upon a certain Riemannian geometry based the concept of Lebesgue integral. This has in on linear algebra and tensor calculus in tangent spaces. In the meantime conquered the whole world. He some sense, it was a return to Euclid and Archimedes. In a didn’t see the importance of many things of tribute to Alexandrov’s memory, S. S. Kutateladze writes: modern mathematics. He had no relations at all “Alexandroff contributed to mathematics under the with algebraic geometry. …The Russians had slogan: ‘Retreat to Euclid.’ He remarked that the pathos played quite a role in Göttingen. I believe that I of contemporary mathematics is the return to Ancient was the only one who was directly inspired by Greece.” them. But their course was very popular. They Busemann’s work is profound. He was capable of formu- filled a gap. They were familiar with certain lating problems and working on them, without relying on modern tendencies that were not represented the trends that were fashionable in his time. In an article 4 in Göttingen, e.g. topology. that appeared in the Los Angeles Times on June 14, 1985, on the occasion of the attribution of the Lobachevsky prize His first permanent position was at the Illinois Institute to Busemann, the author reports the following: “Few math- of Technology in Chicago, a position which he described ematicians ever make it into public consciousness, but as a “horrible permanent job.” He recalls that this was a 4L. Dembart, An unsung geometer keeps his own plane, 3C. Reid, Hilbert, Springer Verlag, Berlin-New York, 1970. Los Angeles Times, June 14, 1985. 342 NOTICES OF THE AMS VOLUME 65, NUMBER 3 COMMUNICATION Busemann has had a hard time even within his own field, He wanted me to discover theorems about in part, at least, because he never followed the crowd. ” new geometrical spaces with the rule : AB+BC The journalist quotes Busemann saying: “If I have a ≤ AC unless A, B, C lie on a “geodesic curve.” merit, it is that I am not influenced by what other people First I found this funny. Then I began to make do.” He then quotes Bob Brooks, who was Busemann’s conjectures, and he encouraged me to prove colleague at USC: them, first in some particular cases, then in more and more general cases. At some point Tastes change a lot and interests change a lot he said, “You have done enough for the PhD in the space of five years. But there are people dissertation.” who aren’t so interested in keeping up with today’s fads. Busemann is very definitely in He often took us to his home. Together with that category. three other PhD students, we used go to his We also read in the same article: house one afternoon per week. Each of us was supposed to present some theorem or Busemann characterizes his basic mathemat- unsolved problem, on a blackboard hanging on ical approach this way: “Any apparently dif- the wall at his backyard. He would make some ficult problem can be done with very simple remarks on what direction we should turn methods. This is the property of many of my to, some easy special cases we had to study things. I see a simple geometric reason which first, etc.
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