fact: Definition functor2_join {A B C D} {f f' : A -> C} {g g' : B -> D} (h : f == f') (k : g == g') : functor_join f g == functor_join f' g'.
imports: Basics Types Cubical NullHomotopy Extensions Colimits.Pushout Truncations.Core Truncations.Connectedness Pointed.Core WildCat Spaces.Nat.Core