Donald G. Higman
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Donald G. Higman (1928 – 13 February 2006) was an American mathematician known for his discovery, in collaboration with Charles C. Sims, of the Higman–Sims group.
He received his Ph.D. in 1952 from the University of Illinois Urbana-Champaign under Reinhold Baer, and served on the faculty of mathematics at the University of Michigan from 1956 to 1998.
His work on homological aspects of group representation theory established the concept of a relatively projective module and explained its role in the theory of module decompositions. His theory of rank 3 permutation groups contributed to the discovery of several of the sporadic simple groups.
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