∀ {B : Type u_2} {G : Type u_3} [inst : CommRing B] [inst_1 : Group G] [inst_2 : MulSemiringAction G B]
  [inst_3 : Fintype G] (b : B) (n : ℕ) (g : G),
  g • (MulSemiringAction.charpoly G b).coeff n = (MulSemiringAction.charpoly G b).coeff n