English
There is a pushout description relating localization and algebra structures: the pushout of R → T and R → A along S yields B with IsLocalization (Algebra.algebraMapSubmonoid T S) B iff IsPushout R T A B.
Русский
Существует описание через граничение (pushout) локализации и алгебраических структур: локализация совместно с алгеброй описывает совместимость через граничение.
LaTeX
$$IsLocalization (Algebra.algebraMapSubmonoid T S) B \iff IsPushout R T A B$$
Lean4
/-- If `A` is a localization of `R`, tensoring two `A`-algebras over `A` is the same as
tensoring them over `R`. -/
noncomputable def algebraTensorEquiv : B ⊗[A] C ≃ₐ[A] B ⊗[R] C :=
have := tensorProduct_compatibleSMul S A B C
Algebra.TensorProduct.equivOfCompatibleSMul R A B C