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arxiv: 0809.3644 · v1 · submitted 2008-09-22 · 🧮 math.FA

The group of isometries of a Banach space and duality

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keywords groupisometriesbanachoperatorsspacesurjectiveconcerningconstruct
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We construct an example of a real Banach space whose group of surjective isometries has no uniformly continuous one-parameter semigroups, but the group of surjective isometries of its dual contains infinitely many of them. Other examples concerning numerical index, hermitian operators and dissipative operators are also shown.

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