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ON THE DECIDABILITY OF THE ${{\rm{\Sigma }}_2}$ THEORIES OF THE ARITHMETIC AND HYPERARITHMETIC DEGREES AS UPPERSEMILATTICES
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- Journal:
- The Journal of Symbolic Logic / Volume 82 / Issue 4 / December 2017
- Published online by Cambridge University Press:
- 09 January 2018, pp. 1496-1518
- Print publication:
- December 2017
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- Article
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