proposition: Lemma filterdiff_plus (F : (V * V -> Prop) -> Prop) : filterdiff (fun u => plus (fst u) (snd u)) F (fun u => plus (fst u) (snd u)).
proof: Proof. apply filterdiff_linear. by apply is_linear_plus. Qed.
imports: Coq(Reals Psatz ssreflect) Rcomplements Rbar Lim_seq Iter Hierarchy Continuity Equiv