fact: Definition equiv_path_pullback {A B C} (f : B -> A) (g : C -> A) (x y : Pullback f g) : { p : x.1 = y.1 & { q : x.2.1 = y.2.1 & PathSquare (ap f p) (ap g q) x.2.2 y.2.2 } } <~> (x = y).
imports: HoTT.Basics HoTT.Types HFiber PathAny Cubical.PathSquare Diagrams.CommutativeSquares