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Publisher Summary This chapter discusses the automorphisms of extra-special groups and nonvanishing degree 2 cohomology. If E be an extra-special group of order 2 n+1 , then n ≥ 1. The chapter identifies (E) with the relevant orthogonal group 0 ɛ (2n, 2), ɛ = ±.
Robert L. Griess (1973) studied this question.
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