fact: Definition equiv_unfunctor_sum_r {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))) : B <~> B' := Build_Equiv _ _ (unfunctor_sum_r h Hb) (isequiv_unfunctor_sum_r h Ha Hb).
imports: HoTT.Basics Types.Empty Types.Unit Types.Prod Types.Sigma Types.Bool Types.Forall