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A proof-theoretic characterization of observational equivalence

✍ Scribed by Colin Stirling


Publisher
Elsevier Science
Year
1985
Tongue
English
Weight
932 KB
Volume
39
Category
Article
ISSN
0304-3975

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## Abstract We give a simple game‐theoretic proof of Silver's theorem that every analytic set is Ramsey. A set __P__ of subsets of Ο‰ is called Ramsey if there exists an infinite set __H__ such that either all infinite subsets of __H__ are in __P__ or all out of __P.__ Our proof clarifies a strong c