proposition: Lemma continuousN (f : T -> V) x : {for x, continuous f} -> {for x, continuous (fun x => - f x)}.
proof: Proof. by move=> ?; apply: cvgN. 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