proposition: Lemma nondecnP : (forall i, f i <= f i.+1) -> {homo f : i j / i <= j}.
proof: Proof. by apply: homo_leq => //; apply: le_trans. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat choice seq) mathcomp(path fintype tuple bigop finset div prime finfun) mathcomp(finset)