proposition: Lemma real_oppr_min : {in real &, {morph -%R : x y / min x y >-> max x y : R}}.
proof: Proof. by move=> x y xr yr; rewrite -[RHS]opprK real_oppr_max ?realN// !opprK. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(ssrAC div fintype path bigop order finset fingroup) mathcomp(ssralg poly)