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- Thread starter dwsmith
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- Jan 30, 2012

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Even though z has a power of n?coefficientsof the series. In other words, $z$ should not be in the ratio.

---------- Post added at 08:07 PM ---------- Previous post was at 07:21 PM ----------

I see my mistake. It should be z not z^nEven though z has a power of n?

- Jan 30, 2012

- 2,492

In a power series $\sum a_nz^n$, the numbers $a_n$ are called coefficients and the products $a_nz^n$ are called terms. The ratio test involves the ratio of coefficients, not terms. The ratio $a_{n+1}/a_n$ has nothing to do with $z$.It should be z not z^n

- Feb 13, 2012

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Kind regards

$\chi$ $\sigma$

- Jan 30, 2012

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