proposition: Lemma is_cvg_cst (U : topologicalType) (x : U) (T : Type) (F : set_system T) {FF : Filter F} : cvg ((fun _ : T => x) @ F).
proof: Proof. by apply: cvgP; apply: cvg_cst. Qed.
imports: HB(structures) mathcomp(all_ssreflect all_algebra finmap generic_quotient) mathcomp(boolp classical_sets functions) mathcomp(cardinality mathcomp_extra fsbigop) reals signed