mathlib3

5dd35377 - feat(algebra/algebra/subalgebra): `subalgebra.map` commutes with supremum (#10899)

feat(algebra/algebra/subalgebra): `subalgebra.map` commutes with supremum (#10899) This PR proves `(S ⊔ T).map f = S.map f ⊔ T.map f`. Co-authored-by: tb65536 <tb65536@users.noreply.github.com>