Σ10 and Π10 equivalence structures

Douglas Cenzer,Valentina S. Harizanov,Jeffrey B. Remmel

Annals of Pure and Applied Logic（2011）

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摘要

We study computability theoretic properties of Σ10 and Π10 equivalence structures and how they differ from computable equivalence structures or equivalence structures that belong to the Ershov difference hierarchy. Our investigation includes the complexity of isomorphisms between Σ10 equivalence structures and between Π10 equivalence structures.

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03C57,03D45

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