Hans Julius Zassenhaus Emil Artin and Erich Hecke , his interests shifted to mathematics. Already as a student, Zassenhaus established himself as a serious mathematician. Among other things he found a new and beautiful proof (cf. ) of the Jordan theorem via the celebrated Zassenhaus (butterfly) lemma. In his 1934 dissertation (cf. ), written under Artin's supervision, he classified 3-fold transitive permutation groups whose elements are determined by their resrtictions to three points. From 1934 to 1936 Zassenhaus worked at the University of Rostock, where he completed the first draft of his book on group theory (cf. ), based on Artin's lectures, which became an instant classic. In 1936 he was appointed Artin's assistant at Hamburg, where he remained for the next four years, despite the ouster of Artin by the Nazis. There he completed his habilitation (cf. ) on Lie rings of prime characteristic. In 1940, resisting intense pressure to join the Nazi party as a condition for retaining his position, he resigned and joined the German navy, where he worked as a meteorologist throughout World War II. After the war he returned to Hamburg, where he was appointed chairman of the mathematics department. In 1949 he accepted a professorship at McGill University in Montreal, a position he retained for ten years. In 1959 he joined the faculty at the University of Notre Dame, where he also became the Director of the Computing Center. In 1963 he moved to The Ohio State University, at the behest of Arnold Ross, who had just become chairman after holding the same position at Notre Dame. | |
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