fact: Definition weqstnsum_invmap_step2 {n : nat} (f : ⟦S n⟧ -> nat) (k : ⟦f lastelement⟧) : weqstnsum_invmap f (weqfromcoprodofstn_map (stnsum (λ x, f (dni lastelement x))) (f lastelement) (ii2 k)) = (lastelement,,k).
imports: UniMath.Foundations.NaturalNumbers UniMath.MoreFoundations.Tactics UniMath.MoreFoundations.DecidablePropositions UniMath.MoreFoundations.NegativePropositions