proposition: Lemma ltr_distlDr x y e : `|x - y| < e -> x < y + e.
proof: Proof. exact: real_ltr_distlDr. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(ssrAC div fintype path bigop order finset fingroup) mathcomp(ssralg poly)