anonymous
  • anonymous
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.
Mathematics
jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
Sorry, I mean min(a_n, 1/n)
anonymous
  • anonymous
X3 bad typo
anonymous
  • anonymous
....

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