Def RingEquiv.opOp

Modification history

2023-08-14 19:43
Mathlib/Algebra/Ring/Equiv.lean
feat(Algebra/Algebra/Opposite): `A ≃ₐ[R] Aᵐᵒᵖᵐᵒᵖ` and `(A ≃ₐ[R] Bᵐᵒᵖ) ≃ (Aᵐᵒᵖ ≃ₐ[R] B)` (#6525) …
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