proposition: Lemma cvgZr k f a : f @ F --> a -> k \*: f @ F --> k *: a.
proof: Proof. apply: cvgZ => //; exact: cvg_cst. Qed.
imports: HB(structures) mathcomp(all_ssreflect ssralg ssrint ssrnum finmap matrix) mathcomp(rat interval zmodp vector fieldext falgebra) mathcomp(mathcomp_extra boolp classical_sets functions) mathcomp(cardinality set_interval Rstruct) ereal reals signed topology prodnormedzmodule