Physics, 19.07.2019 03:30 xojade

If bj > 0 for every j and if p ∞j =1 bj converges then prove that p ∞j=1( bj)2 converges. prove that the assertion is false if the positivity hypothesis is omitted. how about third powers?

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If bj > 0 for every j and if p ∞j =1 bj converges then prove that p ∞j=1( bj)2 converges. prove...