Dynamics of infinite-dimensional groups : the Ramsey-Dvoretzky-Milman phenomenon
著者
書誌事項
Dynamics of infinite-dimensional groups : the Ramsey-Dvoretzky-Milman phenomenon
(University lecture series, v. 40)
American Mathematical Society, c2006
- タイトル別名
-
Dynamics of infinite-dimentional groups and Ramsey-type phenomena
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注記
Rev. ed. of: Dynamics of infinite-dimentional groups and Ramsey-type phenomena. Brazil : IMPA, 2005
Includes bibliographical references (p. 183-190) and index
内容説明・目次
内容説明
The ""infinite-dimensional groups"" in the title refer to unitary groups of Hilbert spaces, the infinite symmetric group, groups of homeomorphisms of manifolds, groups of transformations of measure spaces, etc. The book presents an approach to the study of such groups based on ideas from geometric functional analysis and from exploring the interplay between dynamical properties of those groups, combinatorial Ramsey-type theorems, and the phenomenon of concentration of measure. The dynamics of infinite-dimensional groups is very much unlike that of locally compact groups. For instance, every locally compact group acts freely on a suitable compact space (Veech). By contrast, a 1983 result by Gromov and Milman states that whenever the unitary group of a separable Hilbert space continuously acts on a compact space, it has a common fixed point. In the book, this new fast-growing theory is built strictly from well-understood examples up. The book has no close counterpart and is based on recent research articles. At the same time, it is organized so as to be reasonably self-contained. The topic is essentially interdisciplinary and will be of interest to mathematicians working in geometric functional analysis, topological and ergodic dynamics, Ramsey theory, logic and descriptive set theory, representation theory, topological groups, and operator algebras.
目次
Introduction The Ramsey-Dvoretzky-Milman phenomenon The fixed point on compacta property The concentration property Levy groups Urysohn metric space and its group of isometries Minimal flows Further aspects of concentration Oscillation stability and distortion Bibliography Index.
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