x⁢(1-x)⁢∂2⁡F4∂⁡x2-2⁢x⁢y⁢∂2⁡F4∂⁡x⁢∂⁡y-y2⁢∂2⁡F4∂⁡y2+(γ-(α+β+1)⁢x)⁢∂⁡F4∂⁡x-(α+β+1)⁢y⁢∂⁡F4∂⁡y-α⁢β⁢F4=0,