proposition: Lemma lubACA : interchange lub lub.
proof: Proof. by move=> x y z t; rewrite !lubA [X in X [+] _]lubAC. Qed.
imports: HB(structures) Reals mathcomp(all_ssreflect ssralg ssrnum) mathcomp(mathcomp_extra boolp classical_sets Rstruct reals) mathcomp(finmap) Reals_ext realType_ext classical_sets_ext ssrR fdist fsdist convex