proposition: Lemma filter_getP {T : pointedType} (F : set_system T) {FF : ProperFilter F} (P : set T) : F P -> P (get P).
proof: Proof. by move=> /filter_ex /getPex. Qed.
imports: HB(structures) mathcomp(all_ssreflect all_algebra finmap generic_quotient) mathcomp(boolp classical_sets functions) mathcomp(cardinality mathcomp_extra fsbigop) reals signed