Kν⁡(z)=(12⁢z)ν4⁢π⁢ⅈ⁢∫c-ⅈ⁢∞c+ⅈ⁢∞Γ⁡(t)⁢Γ⁡(t-ν)⁢(12⁢z)-2⁢t⁢ⅆ⁡t,