proposition: Lemma dni_neq_i {n : nat} (i : ⟦S n⟧) (j : ⟦n⟧ ) : i ≠ @dni n i j.
proof: Proof. intros. simpl. apply di_neq_i. Defined.
imports: UniMath.Foundations.NaturalNumbers UniMath.MoreFoundations.Tactics UniMath.MoreFoundations.DecidablePropositions UniMath.MoreFoundations.NegativePropositions