fact: Definition d2 {X Y Z : UU} (f : X -> Y) (g : Y -> Z) (z : Z) (fs : fibseqstr f g z) (y : Y) (x : X) (e : (f x) = y) : (g y) = z := pathscomp0 (maponpaths g (pathsinv0 e)) ((pr1 fs) x).
imports: UniMath.Foundations.Preamble