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Math Help - Absolute and conditional convergence

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    Absolute and conditional convergence

    infinity over sigma n=1 (-1)^n*n^4/n^3+1 Find if the series converges absolutely or not at all.
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    Quote Originally Posted by Link88 View Post
    infinity over sigma n=1 (-1)^n*n^4/n^3+1 Find if the series converges absolutely or not at all.
    do you mean \sum_{n = 1}^\infty \frac {(-1)^n n^4}{n^3 + 1}??

    consider this: \lim_{n \to \infty} \frac {n^4}{n^3 + 1} = \infty
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    what test should i use to show this?
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    Quote Originally Posted by Link88 View Post
    what test should i use to show this?
    The fact that | a_n | \not \rightarrow 0 should be a pretty good clue I would have thought ....
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