Lemma weqoverdnicoprod_eq1 {n : nat} (P: ⟦S n⟧ → UU) j p : invmap (weqoverdnicoprod P) (ii1 (j,,p)) = ( dni lastelement j ,, p ). Proof. intros. simpl in p. apply idpath. Defined.
Require Import UniMath.MoreFoundations.Tactics. Require Import UniMath.MoreFoundations.DecidablePropositions. Require Import UniMath.MoreFoundations.NegativePropositions.