fact: Definition fibseq1 {X Y Z : UU} (f :X -> Y) (g : Y -> Z) (z : Z) (fs : fibseqstr f g z) (y : Y) : fibseqstr (d1 f g z fs y) f y := make_fibseqstr _ _ _ _ (isweqezmap1 f g z fs y).
imports: UniMath.Foundations.Preamble