proposition: Lemma size_opp p1 : size (opp p1) = size p1.
proof: Proof. by rewrite /size /opp size_map. Qed.
imports: Coq(ZArith Reals) Coquelicot(Coquelicot) mathcomp.ssreflect(ssreflect ssrfun ssrbool eqtype ssrnat seq fintype bigop) Flocq(Core) Stdlib MathComp Interval Xreal Basic_rec