fact: Definition mapinO_homotopic {A B : Type} (f : A -> B) {g : A -> B} (p : f == g) `{MapIn O _ _ f} : MapIn O g.
imports: HoTT.Basics HoTT.Types Equiv.BiInv Extensions HProp HFiber NullHomotopy Limits.Pullback PathAny Colimits.Pushout