θ[𝜶𝜷](𝐳+𝐦1+𝛀𝐦2|𝛀)=e2πi(𝜶𝐦1𝜷𝐦212𝐦2𝛀𝐦2𝐦2𝐳)θ[𝜶𝜷](𝐳|𝛀).