$$\begin{array}{llll}\hfill K\left(k\right)& =R_F\left(0,1-k^2,1\right)& \hfill & \\ \hfill E\left(k\right)& =R_F\left(0,1-k^2,1\right)-\frac{1}{3}{k}^2{R}_D\left(0,1-k^2,1\right)& \hfill & \\ \hfill \Pi \left(n,k\right)& =R_F\left(0,1-k^2,1\right)+\frac{1}{3}n{R}_J\left(0,1-k^2,1,1-n\right)& \hfill & \end{array}$$