proposition: Lemma neset_image_neq0 A B (f : A -> B) (X : neset A) : f @` X != set0.
proof: Proof. apply/set0P; eexists; exact/imageP. 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