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Banach spaces, function spaces, real functions, integral transforms, theory of distributions, measure theory.

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Particular types of basis on a normed vector space of finite dimension

Is it true that on every normed vector space $V$ of dimension $n$ there exists a basis of norm $1$ vectors $v_i$, such that $\|\sum_{i=1}^n\epsilon_iv_i\|\geq 1$ for all possible combinations of $\ep …
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