{G : Type u_1} →
  [inst : Group G] →
    {H : Subgroup G} →
      {motive : H.Characteristic → Sort u} →
        ((fixed : ∀ (ϕ : G ≃* G), Subgroup.comap ϕ.toMonoidHom H = H) → motive ⋯) → (t : H.Characteristic) → motive t