proposition: Lemma size_rec2 F x y n: size (rec2 F x y n) = n.+1.
proof: Proof. by apply size_rec2up. 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