proposition: Lemma oppfO (F : filter_on T) (h f : T -> V) (e : T -> W) : f =O_F e -> - f =O_F e.
proof: Proof. by move->; rewrite oppO. Qed.
imports: HB(structures) mathcomp(all_ssreflect ssralg ssrnum) mathcomp(mathcomp_extra boolp classical_sets functions) ereal reals signed topology normedtype prodnormedzmodule