ⅆ2⁡wⅆ⁡z2+(1-a1-a2z-α+1-b1-b2z-β+1-c1-c2z-γ)⁢ⅆ⁡wⅆ⁡z+((α-β)⁢(α-γ)⁢a1⁢a2z-α+(β-α)⁢(β-γ)⁢b1⁢b2z-β+(γ-α)⁢(γ-β)⁢c1⁢c2z-γ)⁢w(z-α)⁢(z-β)⁢(z-γ)=0,