Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2021-03-08 14:38 13d86df6

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chore(algebra/monoid_algebra): provide finer-grained levels of structure for less-structured G. (#6572) This provides distrib and mul_zero_class for when G is just has_mul, and semigroup for when G is just semigroup. It also weakens the typeclass assumptions on some correspondings lemmas.

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