fact: Definition unfunctor_sum_eta {A A' B B' : Type} (h : A + B -> A' + B') (Ha : forall a:A, is_inl (h (inl a))) (Hb : forall b:B, is_inr (h (inr b))) : functor_sum (unfunctor_sum_l h Ha) (unfunctor_sum_r h Hb) == h.
imports: HoTT.Basics Types.Empty Types.Unit Types.Prod Types.Sigma Types.Bool Types.Forall