Theorem AlgebraicGeometry.IsAffineOpen.fromSpecStalk_eq_fromSpecStalk

feat(AlgebraicGeometry): Classification of `Spec R ⟶ X` with `R` local. (#15240)

Feat(AlgebraicGeometry/FromSpecStalk): Given a scheme `X` and a point `x : X`, the canonical scheme morphism from `Spec(O_x)` to `X`. (#13885) …