Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2021-03-10 02:23 fad44b9f

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feat(ring_theory/ideal/operations): add quotient_equiv (#6492) The ring equiv R/I ≃+* S/J induced by a ring equiv f : R ≃+* S, where J = f(I), and similarly for algebras.

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