proposition: Lemma oppr_min : {morph -%R : x y / min x y >-> max x y : R}.
proof: Proof. by move=> x y; apply: real_oppr_min. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(ssrAC div fintype path bigop order finset fingroup) mathcomp(ssralg poly)