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- 29Number of isomorphism types of finite groups
- 212x2 subdeterminants of a matrix
- 21Groups that do not exist
- 20Where are the second- (and third-)generation proofs of the classification of finite simple groups up to?
- 20Does Zhang's theorem generalize to $3$ or more primes in an interval of fixed length?
- 16Reference for the triple covering of A_6
- 15Simplicity of $A_n.$
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8 MO-Hard Questions Aug 14 '14