feat(algebraic_geometry): Restriction of morphisms onto open sets of the target (#14972)
feat(algebraic_geometry): Restriction of morphisms onto open sets of the target (#14972)




Co-authored-by: Andrew Yang <5a6b17dbbc661dec6b250b080ab0033de7d56af5@users.noreply.github.com>

leanprover-community/mathlib,leanprover-community/mathlib