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badreferences

  • 2 years ago

Here's your math challenge of the day. Let (a_n) be a sequence of positive real numbers, decreasing and the sum of whose terms are infinite. Prove that the series whose general term is min(a_n) is also divergent. Taken from AoPS, and by extension, the German TST. It's a pretty problem.

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  1. badreferences
    • 2 years ago
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    Sorry, I mean min(a_n, 1/n)

  2. badreferences
    • 2 years ago
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    X3 bad typo

  3. TheWriter
    • 2 years ago
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    ....

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