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＜電子ブック＞
Recurrence in Topological Dynamics : Furstenberg Families and Ellis Actions / by Ethan Akin
(University Series in Mathematics)

版	1st ed. 1997.
出版者	(New York, NY : Springer US : Imprint: Springer)
出版年	1997
本文言語	英語
大きさ	X, 266 p : online resource
著者標目	*Akin, Ethan author SpringerLink (Online service)
件　名	LCSH:Topology FREE:Topology
一般注記	1. Monoid Actions -- 2. Furstenberg Families -- 3. Recurrence -- 4. Transitive and Central Systems -- 5. Compactifications -- 6. Ellis Semigroups and Ellis Actions -- 7. Semigroups and Families -- 8. Equicontinuity -- Appendix. Semicontinuous Relations and Almost Open Maps -- References In the long run of a dynamical system, after transient phenomena have passed away, what remains is recurrence. An orbit is recurrent when it returns repeatedly to each neighborhood of its initial position. We can sharpen the concept by insisting that the returns occur with at least some prescribed frequency. For example, an orbit lies in some minimal subset if and only if it returns almost periodically to each neighborhood of the initial point. That is, each return time set is a so-called syndetic subset ofT= the positive reals (continuous time system) or T = the positive integers (discrete time system). This is a prototype for many of the results in this book. In particular, frequency is measured by membership in a family of subsets of the space modeling time, in this case the family of syndetic subsets of T. In applying dynamics to combinatorial number theory, Furstenberg introduced a large number of such families. Our first task is to describe explicitly the calculus of families implicit in Furstenberg's original work and in the results which have proliferated since. There are general constructions on families, e. g. , the dual of a family and the product of families. Other natural constructions arise from a topology or group action on the underlying set. The foundations are laid, in perhaps tedious detail, in Chapter 2. The family machinery is then applied in Chapters 3 and 4 to describe family versions of recurrence, topological transitivity, distality and rigidity HTTP:URL=https://doi.org/10.1007/978-1-4757-2668-8

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