fact: Definition isexact_square_if n {F F' X X' Y Y' : pType} {i : F ->* X} {i' : F' ->* X'} {f : X ->* Y} {f' : X' ->* Y'} (g : F' <~>* F) (h : X' <~>* X) (k : Y' <~>* Y) (p : h o* i' ==* i o* g) (q : k o* f' ==* f o* h) `{IsExact n F X Y i f} : IsExact n i' f'.
imports: Basics Types SuccessorStructure WildCat Pointed Modalities.Identity Modalities.Descent Truncations HFiber ObjectClassifier