fact: Definition weqhfibersg'tof {X X' Y Z : UU} (f : X -> Y) (f' : X' -> Y) (g : Z -> X) (g' : Z -> X') (hf : hfsqstr f f' g g') (x' : X') := make_weq _ (isweqhfibersg'tof _ _ _ _ hf x').
imports: UniMath.Foundations.Preamble