proposition: Lemma iscontrhfiberdni ( n : nat ) ( i j : ⟦S n⟧ ) : i ≠ j -> iscontr ( hfiber ( dni i ) j ).
proof: Proof. intros ne. exact ( iscontrweqb ( weqhfiberdnihfiberdi n i j ) ( iscontrhfiberdi i j ne ) ). Defined.
imports: UniMath.Foundations.NaturalNumbers UniMath.MoreFoundations.Tactics UniMath.MoreFoundations.DecidablePropositions UniMath.MoreFoundations.NegativePropositions