proposition: Lemma cvgNey f : (\- f @ F --> +oo) <-> (f @ F --> -oo).
proof: Proof. rewrite cvgeNyPler cvgeyPger; split=> Foo A Areal; by near do rewrite -lee_opp2 ?oppeK; apply: Foo; rewrite rpredN. Unshelve. all: end_near. 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