proposition: Lemma cvgeB f g a b : a +? - b -> f @ F --> a -> g @ F --> b -> f \- g @ F --> a - b.
proof: Proof. by move=> ab fa gb; apply: cvgeD => //; exact: cvgeN. 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