\[F_{n}(x)=\frac{p_{n-1}^{(1)}(x)}{p_{n}(x)}=\frac{p_{n}^{(0)}(x)}{p_{n}(x)}=%
\frac{1}{\mu_{0}}\sum_{k=1}^{n}\frac{w_{k}}{x-x_{k}},\]