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Questions about the branch of algebra that deals with groups.

28 votes
2 answers
3k views

Number of finite simple groups of given order is at most 2 - is a classification-free proof ...

This Wikipedia article states that the isomorphism type of a finite simple group is determined by its order, except that: L4(2) and L3(4) both have order 20160 O2n+1(q) and S2n(q) have the same orde …