Lemma isinclstntonat ( n : nat ) : isincl ( stntonat n ). Proof. intro. use isinclpr1. intro x. apply ( pr2 ( natlth x n ) ). Defined.
Require Import UniMath.MoreFoundations.Tactics. Require Import UniMath.MoreFoundations.DecidablePropositions. Require Import UniMath.MoreFoundations.NegativePropositions.