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Classification and orbit equivalence relations - Greg Hjorth

9780821820025
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Title
Classification and orbit equivalence relations
Author
Greg Hjorth
format
Hardback
Publisher
American Mathematical Society
Language
English
UK Publication Date
19991130

Actions of Polish groups are ubiquitous in mathematics. In certain branches of ergodic theory and functional analysis, one finds a systematic study of the group of measure-preserving transformations and the unitary group. In logic, the analysis of countable models intertwines with results concerning the actions of the infinite symmetric group. This text develops the theory of Polish group actions entirely from scratch, ultimately presenting a coherent theory of the resulting orbit equivalence classes that may allow complete classification by invariants of an indicated form.The book concludes with a criterion for an orbit equivalence relation classifiable by countable structures considered up to isomorphism. This self-contained volume offers a complete treatment of this active area of current research and develops a difficult general theory classifying a class of mathematical objects up to some relevant notion of isomorphism or equivalence. Greg Hjorth received the Carol Karp Prize for outstanding work on turbulence and countable Borel equivalence relations from the Association of Symbolic Logic.

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Type
BOOK
Keyword Index
Equivalence classes (Set theory)|Equivalence relations (Set theory)|Classification.
Country of Publication
Rhode Island
Number of Pages
195

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