proposition: Lemma cvgeN f x : f @ F --> x -> - f x @[x --> F] --> - x.
proof: Proof. by move=> ?; apply: continuous_cvg => //; exact: oppe_continuous. 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