proposition: Lemma neset_ext (a b : neset A) : a = b :> set _ -> a = b.
proof: Proof. move: a b => -[a Ha] -[b Hb] /= ?; subst a. congr NESet.Pack; exact/Prop_irrelevance. 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