proposition: Lemma galNormV : {morph galNorm U V : a / a^-1}.
proof: Proof. by move=> a /=; rewrite -prodfV; apply: eq_bigr => x _; rewrite fmorphV. Qed.
imports: HB(structures) mathcomp(ssreflect ssrbool ssrfun eqtype ssrnat seq div) mathcomp(choice fintype tuple finfun bigop ssralg poly) mathcomp(polydiv finset fingroup morphism quotient perm) mathcomp(action zmodp cyclic matrix mxalgebra vector) mathcomp(falgebra fieldext separable)