π⁢ⅈ⁢Jν⁡(z)=ⅇ-ν⁢π⁢ⅈ/2⁢Kν⁡(z⁢ⅇ-π⁢ⅈ/2)-ⅇν⁢π⁢ⅈ/2⁢Kν⁡(z⁢ⅇπ⁢ⅈ/2),