fact: Definition biglub_necset (X : neset (necset A)) : necset A := NECSet.Pack (NECSet.Class (CSet.Mixin (hull_is_convex (\bigcup_(i in X) idfun i)%:ne)) (NESet.Mixin (pre_op_neq0 X))).
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