proposition: Lemma range1zz m : range1 m m.
proof: Proof. by split; rewrite // -intRD1; apply/intR_ltP. Qed.
imports: mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat div order) mathcomp(ssralg ssrnum ssrint rat intdiv) Coq(Morphisms Setoid) fourcolor(real realsyntax)