Bi⁡-z=z/3⁢J-1/3⁡ζ-J1/3⁡ζ=12⁢z/3⁢ⅇ2⁢π⁢ⅈ/3⁢H1/31⁡ζ+ⅇ-2⁢π⁢ⅈ/3⁢H1/32⁡ζ=12⁢z/3⁢ⅇπ⁢ⅈ/3⁢H-1/31⁡ζ+ⅇ-π⁢ⅈ/3⁢H-1/32⁡ζ,