Lemma stn_implies_nneq0 { n : nat } (i : ⟦ n ⟧%stn) : n ≠ 0. Proof. apply natgthtoneq, stn_implies_ngt0, i. 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.