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user 9533
This tag is to be used only when re-tagging highly(!) off-topic questions where none of the actual tags would make sense; all actual tags the questioner has used are removed and something is needed to have some tag, which is enforced by the software, so this tag is used. However note that this tag is also used in the process of moderators deleting tags. Thus a question having this tag does most of the time not mean that somebody found it off-topic.
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Singularity of Geometric-like series
I'm trying to figure out exactly what happens as $r\to 1$ of the following function:
$$ f(r) = \sum_{n>0} n^s r^n, $$
where the domain of $f$ is the positive real numbers less than $1$, and $s$ is som …
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