Lemma issymm_stnneq {n : nat} {i j : stn n} (neq : i ≠ j) : (j ≠ i). Proof. apply issymm_natneq; assumption. Defined.
Require Import UniMath.Foundations.All. Require Import UniMath.MoreFoundations.All. Require Import UniMath.Combinatorics.Maybe. Require Import UniMath.Combinatorics.StandardFiniteSets. Require Import UniMath.Algebra.Domains_and_Fields. Require Import UniMath.Algebra.RigsAndRings.