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Isolated 2-computably enumerable Q-degreesIn this work we prove that for every pair of computably enumerable degrees aQ-reducibility and m-reducibility on computably enumerable sets-reducibility on computably enumerable sets. We construct a noncomputable m-incomplete computably enumerable set BStrong noncuppability in low computably enumerable degreesWe prove the existence of noncomputable low computably enumerable degrees b < a such that bAlmost computably enumerable families of sets. Moreover, it is established that for any computably enumerable (c.e.) set A there exists afamily that is XTuring and enumeration jumps in the Ershov hierarchyIn the article, we study the behaviour of enumeration jumps of sets of low e-degrees in the ErshovStrong noncuppability in low computably enumerable degreesWe prove the existence of noncomputable low computably enumerable degrees b < a such that bСтраница 1 из 3613