{P : Sort u} →
  {Γ : Subgroup (GL (Fin 2) ℝ)} →
    {k : ℤ} →
      {t : SlashInvariantForm Γ k} →
        {Γ' : Subgroup (GL (Fin 2) ℝ)} →
          {k' : ℤ} →
            {t' : SlashInvariantForm Γ' k'} → Γ = Γ' → k = k' → t ≍ t' → SlashInvariantForm.noConfusionType P t t'