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Let \left\{\beta_n\right\}\, be a sequence of real numbers such that \sum_{n=1}^\infty \alpha_n\beta_n\, is convergent for every \left\{\alpha_n\right\}\isin l^1\,. Use the Uniform Boundedness theorem to prove that \left\{\beta_n\right\} \isin l^\infty\,.

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