Definition stn_left_compute (m n : nat) (i: ⟦m⟧ ) : pr1 (stn_left m n i) = i. Proof. intros. apply idpath. Defined.
Require Import UniMath.MoreFoundations.Tactics. Require Import UniMath.MoreFoundations.DecidablePropositions. Require Import UniMath.MoreFoundations.NegativePropositions.