w⁡(z;a,b,a¯,b¯)=Γ⁡(a+ⅈ⁢z)⁢Γ⁡(b+ⅈ⁢z)⁢Γ⁡(a¯-ⅈ⁢z)⁢Γ⁡(b¯-ⅈ⁢z),