proposition: Lemma ltrP x y : ltr_xor_ge x y (min y x) (min x y) (max y x) (max x y) `|x - y| `|y - x| (y <= x) (x < y).
proof: Proof. exact: real_ltP. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(ssrAC div fintype path bigop order finset fingroup) mathcomp(ssralg poly)