proposition: Lemma cvgNeNy f : (\- f @ F --> -oo) <-> (f @ F --> +oo).
proof: Proof. by rewrite -cvgNey (_ : \- \- f = f)//; apply/funeqP => x /=; 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