Ej⁢k⁡(x)=12⁢π⁢ⅈ⁢∫qj⁢k-ⅈ⁢∞qj⁢k+ⅈ⁢∞x-z⁢Gj⁢k⁡(z)⁢ⅆ⁡z=o⁡(x-qj⁢k)