proposition: Lemma galNorm0 : galNorm U V 0 = 0.
proof: Proof. by rewrite /galNorm (bigD1 1%g) ?group1 // rmorph0 /= mul0r. 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)