fact: Definition path_prod_V {A B : Type} (u v: A * B) (p : fst u = fst v) (q : snd u = snd v) : path_prod v u p^ q^ = (path_prod u v p q)^.
imports: Basics.Overture Basics.Equivalences Basics.PathGroupoids Basics.Tactics Basics.Trunc Basics.Decidable Types.Empty