\[\frac{\Delta_{y}\left(R_{n}\left(y(y+\gamma+\delta+1);\gamma,\delta,N\right)%
\right)}{\Delta_{y}\left(y(y+\gamma+\delta+1)\right)}=-\frac{n}{(\gamma+1)N}\*%
R_{n-1}\left(y(y+\gamma+\delta+2);\gamma+1,\delta,N-1\right).\]