In the mathematical field of group theory, the O'Nan group or O'Nan–Sims group O'N is a sporadic simple group of order
- 29 · 34 · 5 · 73 · 11 · 19 · 31
- = 460815505920
found by Michael O'Nan (1976).
The Schur multiplier has order 3, and its outer automorphism group has order 2.
O'N is one of the 6 sporadic simple groups called the pariahs, because they are not found within the Monster group.
Read more about O'Nan Group: History, Representations, Maximal Subgroups
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