I tried using the definition of absolute convergence (similar to Cauchy Criterion), but had trouble reaching at ajbj. Any help would be greatly appreciated. Thanks
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apply the Cauchy-Schwarz inequality.
but how do I get rid of the square signs on sequence a and b?
I can't make a connection
Here's what I just tried.
but the absolute sign is around the whole summation, not just the term.
Am I doing this right?
i wasn't actually talking about that kind of application, what i meant is
(ohhh, may be it's the same, it's just that i'm not so familiar with norms.)
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