proposition: Lemma cvg_id T (F : set_system T) : x @[x --> F] --> F.
proof: Proof. exact. Qed.
imports: HB(structures) mathcomp(all_ssreflect all_algebra finmap generic_quotient) mathcomp(boolp classical_sets functions) mathcomp(cardinality mathcomp_extra fsbigop) reals signed