proposition: Lemma ltr_sqr : {in nneg &, {mono (fun x => x ^+ 2) : x y / x < y}}.
proof: Proof. exact: ltr_pXn2r. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(ssrAC div fintype path bigop order finset fingroup) mathcomp(ssralg poly)