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This article is cited in 3 scientific papers (total in 3 papers)
Minimal predicates for $\Delta$-definability
A. S. Morozovab, D. A. Tussupovc a Novosibirsk State University
b Sobolev Institute of Mathematics, Siberian Branch of the Russian Academy of Sciences, Novosibirsk
c Eurasian National University named after L.N. Gumilyov, Nur-Sultan
Abstract:
We consider two kinds of reducibilities on finite families of predicates on a countable set: the definability of predicates and their complements of one family via another by means of existential formulas with parameters and the same definability on isomorphism types of families. Ordered structures of degrees generated by families of unary predicates are described. It is proved that for both reducibilities, there exist continuum many minimal nonzero degrees.
Keywords:
$\Delta$-definability, existential formula, ordered structure of degrees, minimal degrees.
Received: 04.12.2019 Revised: 24.11.2020
Citation:
A. S. Morozov, D. A. Tussupov, “Minimal predicates for $\Delta$-definability”, Algebra Logika, 59:4 (2020), 480–499; Algebra and Logic, 59:4 (2020), 328–340
Linking options:
https://www.mathnet.ru/eng/al2628 https://www.mathnet.ru/eng/al/v59/i4/p480
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Abstract page: | 186 | Full-text PDF : | 37 | References: | 30 | First page: | 4 |
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