# normal convergence, meromorphic function

Let $\{ z_k \}$ be a sequence of distinct points such that $|z_k| \rightarrow \infty$ and $\sum_{k=1}^{\infty} |z_k|^{-m-1}< \infty$. Show that $z^m \sum_{k=1}^{\infty} \frac{1}{z_k^m(z-z_k)}$ converges normally to a meromorphic function with principal part $\frac{1}{z-z_k}$ at $z_k$. (If $z_k=0$, we replace the corresponding summand by $\frac{1}{z}$.)