could any one give me a hint for this one? please not the whole solution Let $f$ be a non constant rational function and $z_1,\dots, z_n$ be its poles in $\bar{\mathbb{C}}$. we have to show that $f$ can be written as $f=f_1+\dots,f_p$ where each $f_j$ is a rational function.
decomposition into the sum of rational functions
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complex-analysis
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1I would guess that each $f_j$ is supposed to have only one pole. In that case the magic phrase is either "partial fractions" or "principal parts". – 2012-06-24
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Under Robert Israel's interpretation, you can do induction on the number of poles. Expand $f$ in Laurent series in $\{z:0<|z-z_n|