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Homework Help: Conditionally convergence of a product of a conditonally convergent series

  1. Apr 12, 2009 #1
    1. The problem statement, all variables and given/known data
    1. Find a function such that infinite sum of anis conditionally convergent but infinite sum of (an)^3 does not converge conditionally

    3. The attempt at a solution
    We have confusions about the definition of conditional convergence. Importantly, does absolute convergence also mean conditional convergence? If not, then the sum a simple function an= (-1)n*1/n is conditionally convergent but the sum of its cube is absolutely convergent

    However, if absolute means conditional, then we need to find an such that (an)^3 diverges under all conditions.
    1. The problem statement, all variables and given/known data
  2. jcsd
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