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