Isomorphism relations on computable structures.
JOURNAL OF SYMBOLIC LOGIC(2012)
摘要
We study the complexity of the isomorphism relation on classes of computable structures. We use the notion of FF-reducibility introduced in [9] to show completeness of the isomorphism relation on many familiar classes in the context of all Sigma(1)(1) equivalence relations on hyperarithmetical subsets of omega.
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关键词
isomorphism relations,computable,structures
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