Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2022-02-17 12:16 eb8d58d6

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fix(topology/algebra/basic): remove duplicate lemma (#12097) This lemma duplicates the lemma of the same name in the root namespace, and should not be in this namespace in the first place. The other half of #12072, now that the dependent PR is merged.

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