F⁡(a,bc;x+ⅈ⁢0)-F⁡(a,bc;x-ⅈ⁢0)=2⁢π⁢ⅈΓ⁡(a)⁢Γ⁡(b)⁢(x-1)c-a-b⁢F⁡(c-a,c-bc-a-b+1;1-x),