fact: Parameter fold_polyCons : forall U f iv c p, @fold U f iv (polyCons c p) = f c (@fold U f iv p).
imports: Coq(ZArith Reals) Coquelicot(Coquelicot) mathcomp.ssreflect(ssreflect ssrfun ssrbool eqtype ssrnat seq fintype bigop) Flocq(Core) Stdlib MathComp Interval Xreal Basic_rec