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25 votes

A reference for geometric class field theory?

1) Our (slightly pseudonymous!) friend, Brian Conrad, has written this beautiful introduction to geometric class field theory in his characteristically lucid style. 2) Another friend, Péter Tóth, …
Alex M.'s user avatar
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61 votes

Intuition for Group Cohomology

Here is a completely elementary example which shows that group cohomology is not empty verbiage, but can solve a problem ("parametrization of rational circle") whose statement has nothing to do with c …
Georges Elencwajg's user avatar