Σ 1 0 and Π 1 0 equivalence structures

Annals of Pure and Applied Logic 162 (7):490-503 (2011)

Authors
Valentina Harizanov
George Washington University
Abstract
We study computability theoretic properties of and 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 equivalence structures and between equivalence structures
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DOI 10.1016/j.apal.2011.01.002
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