Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2022-12-04 12:16 4ed0bcae

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feat(algebra/category/Module/simple): 1d modules over k-algebras are simple (#14023) It feels like this should just be a special case of some interesting more general statement, but I'm failing to think what that is. If you notice let me know. Otherwise it's a good fact in any case.

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