proposition: Lemma cvgeNP f a : - f x @[x --> F] --> - a <-> f @ F --> a.
proof: Proof. by split=> /cvgeN//; rewrite oppeK//; under eq_cvg do rewrite /= oppeK. 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