proposition: Lemma stn_eq_2 {k : nat} (i: stn k) (j : nat) (eq : pr1 i = j) (P : j < k) : i = (j,, P).
proof: Proof. intros; apply stn_eq, eq. Defined.
imports: UniMath.Foundations.All UniMath.MoreFoundations.All UniMath.Combinatorics.Maybe UniMath.Combinatorics.StandardFiniteSets UniMath.Algebra.Domains_and_Fields UniMath.Algebra.RigsAndRings