proposition: Lemma cst_continuous {T U : topologicalType} (x : U) : continuous (fun _ : T => x).
proof: Proof. by move=> t; 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