(1-α2)⁢Π⁡(ϕ,α2,k)+(1-ω2)⁢Π⁡(ϕ,ω2,k)=F⁡(ϕ,k)+(1-α2-ω2)⁢c-k2⁢RC⁡(c⁢(c-1),(c-α2)⁢(c-ω2)),