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# Infinite Series of Real Numbers (Absolute Convergence)

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Define ak recursively by a1 = 1 and
ak = (&#8722;1)k

1 + k sin

1
k

&#8722;1
ak&#8722;1, k > 1.
Prove that
P
1k
=1 ak converges absolutely.
Since this problem is an analysis problem, please be sure to be rigorous.

##### Solution Summary

Absolute convergence is proven for an infinie series of real numbers.

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We have to consider the series:

First of all from the given information that a1=1, we see that for k>1:

and then it turns out that:
...

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