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Thread: One more question in converged series

  1. #1
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    One more question in converged series

    Let an be a series of positive elements such as lim_n->infinity_an=0 and the series Sigma_n=1-infinity_an diverge.
    Let bn=(-1)^n*an
    Prove or find counterexamples for the next propositions:
    1. Sigma_bn diverge.
    2. Sigma_bn doesn't absolutely converge.
    3. Sigma_bn converge.



    TNX everyone!
    Last edited by WannaBe; Jan 3rd 2010 at 11:17 AM.
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  2. #2
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    TNX a lot everyone! I've managed to solve this question
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