proposition: Lemma integral_inv x : integralOver FtoE x -> integralOver FtoE x^-1.
proof: Proof. by move/integral_algebraic/algebraic_inv/integral_algebraic. 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)