fact: Definition O_inverts_functor_sum {A B A' B'} (f : A -> A') (g : B -> B') `{O_inverts f} `{O_inverts g} : O_inverts (functor_sum f g).
imports: HoTT.Basics HoTT.Types Equiv.BiInv Extensions HProp HFiber NullHomotopy Limits.Pullback PathAny Colimits.Pushout