$$\begin{array}{llll}\hfill Y_{\mu }& =-\sum _{k=0}^{\infty }{c}_k{g}_k& \hfill & \\ \hfill Y_{\mu +1}& =-\frac{2}{x}\sum _{k=0}^{\infty }{c}_k{h}_k& \hfill & \end{array}$$