Abstract
Recall that a normed linear space X is a Banach space if and only if given any absolutely summable series in ∑n x n in X, lim n ∑ n k-1 x k exists. Of course, in case X is a Banach space, this gives the following implication for a series ∑ n x n : if ∑ n ∥x n ∥ < ∞, then ∑ n x n is unconditionally convergent; that is, ∑ n x π(n) converges for each permutation π of the natural numbers.
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© 1984 Springer-Verlag New York, Inc.
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Diestel, J. (1984). The Dvoretsky-Rogers Theorem. In: Sequences and Series in Banach Spaces. Graduate Texts in Mathematics, vol 92. Springer, New York, NY. https://doi.org/10.1007/978-1-4612-5200-9_6
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DOI: https://doi.org/10.1007/978-1-4612-5200-9_6
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