Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2022-07-15 01:25 09a7f7a1

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refactor(algebra/algebra/subalgebra/basic): Remove ' from subalgebra.comap' (#15349) This PR removes ' from subalgebra.comap'. https://leanprover.zulipchat.com/#narrow/stream/116395-maths/topic/subalgebra.2Ecomap'

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