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Series in Banach Spaces - Conditional and Unconditional Convergence (Hardcover, 1997 ed.)
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Series in Banach Spaces - Conditional and Unconditional Convergence (Hardcover, 1997 ed.)
Series: Operator Theory: Advances and Applications, 94
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Series of scalars, vectors, or functions are among the fundamental
objects of mathematical analysis. When the arrangement of the terms
is fixed, investigating a series amounts to investigating the
sequence of its partial sums. In this case the theory of series is
a part of the theory of sequences, which deals with their
convergence, asymptotic behavior, etc. The specific character of
the theory of series manifests itself when one considers
rearrangements (permutations) of the terms of a series, which
brings combinatorial considerations into the problems studied. The
phenomenon that a numerical series can change its sum when the
order of its terms is changed is one of the most impressive facts
encountered in a university analysis course. The present book is
devoted precisely to this aspect of the theory of series whose
terms are elements of Banach (as well as other topological linear)
spaces. The exposition focuses on two complementary problems. The
first is to char acterize those series in a given space that remain
convergent (and have the same sum) for any rearrangement of their
terms; such series are usually called uncon ditionally convergent.
The second problem is, when a series converges only for certain
rearrangements of its terms (in other words, converges
conditionally), to describe its sum range, i.e., the set of sums of
all its convergent rearrangements."
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