On isometry groups and maximal symmetry
On isometry groups and maximal symmetry
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关于等距群和最大对称性
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发表时间:
2011
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通讯作者:
Christian Rosendal
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作者:
V. Ferenczi;Christian Rosendal
We study problems of maximal symmetry in Banach spaces. This is done by providing an analysis of the structure of small subgroups of the general linear group GL(X ), where X is a separable reflexive Banach space. In particular, we provide the first known example of a Banach space X without any equivalent maximal norm, or equivalently such that GL(X ) contains no maximal bounded subgroup. Moreover, this space X may be chosen to be super-reflexive. In memory of Greg Hjorth (1963–2011) and Nigel Kalton (1946–2010).