proposition: Lemma integral_sub u v : integralOver RtoK u -> integralOver RtoK v -> integralOver RtoK (u - v).
proof: Proof. move=> intRu /integral_opp/intR_XsubC/integral_horner/(_ intRu). by rewrite !hornerE. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat choice seq) mathcomp(div fintype tuple finfun bigop fingroup perm) mathcomp(ssralg zmodp matrix mxalgebra poly polydiv)