proposition: Lemma algebraic_opp x : algebraicOver FtoE x -> algebraicOver FtoE (- x).
proof: Proof. by move/integral_algebraic/integral_opp/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)