kerν⁡x+ⅈ⁢keiν⁡x=ⅇ-ν⁢π⁢ⅈ/2⁢Kν⁡(x⁢ⅇπ⁢ⅈ/4)=12⁢π⁢ⅈ⁢Hν(1)⁡(x⁢ⅇ3⁢π⁢ⅈ/4)=-12⁢π⁢ⅈ⁢ⅇ-ν⁢π⁢ⅈ⁢Hν(2)⁡(x⁢ⅇ-π⁢ⅈ/4).