Browsing by Subject "algebraic structure"

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  • Degrees of Enumerations of Countable Wehner-Like Families 
    Kalimullin I.S.; Faizrahmanov M.K. (2021)
    This paper is a survey of results on countable families with natural degree spectra. These results were obtained by a modification of the methodology proposed by Wechner, who first found a family of sets with the spectrum ...
  • Punctual Categoricity Relative to a Computable Oracle 
    Kalimullin I.S.; Melnikov A.G. (2021)
    Abstract: We are studying the punctual structures, i.e., the primitive recursive structures on the whole set of integers. The punctual categoricity relative to a computable oracle f means that between any two punctual ...

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