proposition: Lemma is_cvgeNE f : cvg (\- f @ F) = cvg (f @ F).
proof: Proof. rewrite propeqE; split=> /cvgeNP/cvgP//. by under eq_is_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