Lemma weqhfiberdnihfiberdi ( n : nat ) ( i j : ⟦S n⟧ ) : ( hfiber ( dni i ) j ) ≃ ( hfiber ( di i ) j ). Proof. intros. apply ( weqhfibersg'tof _ _ _ _ ( dnihfsq n i ) j ). Defined.
Require Import UniMath.MoreFoundations.Tactics. Require Import UniMath.MoreFoundations.DecidablePropositions. Require Import UniMath.MoreFoundations.NegativePropositions.