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23 votes

Isomorphic general linear groups implies isomorphic fields?

The answer to the question is yes, though I don't have all the old literature at my fingertips. This kind of question for various classes of linear groups has a long history in the study of homomorphi …
Jim Humphreys's user avatar
7 votes

Minimal number of generators for $GL(n,\mathbb{Z})$

Though it's a good exercise to work things out directly (as YCor does), the ideas here are all fairly old and can be extracted without much difficulty from the literature as Dietrich's reference indic …
3 votes

Sylow subgroups of projective general linear groups

To reinforce Geoff Robinson's cautious comment, I'd encourage you to dig into a volume of the ongoing treatise by Gorenstein-Lyons-Solomon The Classification of the Finite Simple Groups, Number 3 (Am …
Jim Humphreys's user avatar