fact: Definition weqstnsum_invmap_step1 {n : nat} (f : ⟦S n⟧ -> nat) (j : stn (stnsum (λ x, f (dni lastelement x)))) : weqstnsum_invmap f (weqfromcoprodofstn_map (stnsum (λ x, f (dni lastelement x))) (f lastelement) (ii1 j)) = total2_base_map (dni lastelement) (weqstnsum_invmap (f ∘ dni lastelement) j).
imports: UniMath.Foundations.NaturalNumbers UniMath.MoreFoundations.Tactics UniMath.MoreFoundations.DecidablePropositions UniMath.MoreFoundations.NegativePropositions