fact: Definition square_pfib_pequiv_cxfib {F X Y : pType} (i : F ->* X) (f : X ->* Y) `{IsExact purely F X Y i f} : pequiv_pmap_idmap o* i ==* pfib f o* pequiv_cxfib.
imports: Basics Types SuccessorStructure WildCat Pointed Modalities.Identity Modalities.Descent Truncations HFiber ObjectClassifier