Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2022-08-31 06:55 20cfd341

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refactor(algebra/monoid_algebra/{ basic + support } + import dust): move lemmas to a new "support" file (#16322) This PR moves some lemmas from algebra/monoid_algebra/basic to the new file algebra/monoid_algebra/support. Zulip discussion

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