Definition pr1_dni_lastelement {n : nat} {i: ⟦n⟧ } : pr1 (dni_lastelement i) = pr1 i. Proof. intros. apply idpath. Defined.
Require Import UniMath.MoreFoundations.Tactics. Require Import UniMath.MoreFoundations.DecidablePropositions. Require Import UniMath.MoreFoundations.NegativePropositions.