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Strong Degrees of Categoricity and Weak Density of this result to properly 2-c.e. degrees. We found a condition such that if a Δ02-degree is a degree
Structural properties of Q-degrees of n-c. e. sets on the distribution of incomparable Q-degrees. In another theorem we prove that every incomplete Π2 0 Q-degree forms a
The complements of lower cones of degrees and the degree spectra of structuresComputably enumerable (c.e.) sets
On Fairly Low and Superlow Sets that the proper intermediate place of fairly low sets holds even if we restrict our attention to computably
Structural properties of Q-degrees of n-c. e. sets on the distribution of incomparable Q-degrees. In another theorem we prove that every incomplete Π2 0 Q-degree forms a
Turing Computability: Structural TheoryTuring Computability: Structural Theory
The enumeration spectrum hierarchy of α-families and lowα degrees countable sets in the ZFC-theory with urelements from N. The families from the hierarchy can be coded
On the Problem of Definability of the Computably Enumerable Degrees in the Difference Hierarchy© 2018, Pleiades Publishing, Ltd. Questions of definability of computably enumerable degrees
A semilattice generated by superlow computably enumerable degreesWe prove that a partially ordered set of all computably enumerable (c. e.) degrees
О подмножествах рекурсивно перечислимых множествLet and be the recursively enumerable sets and is total recursive function, which is enumerate A
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