On a problem of Ishmukhametov

Given a d.c.e. degree d , consider the d.c.e. sets in d and the corresponding degrees of their Lachlan sets. Ishmukhametov provided a systematic investigation of such degrees, and proved that for a given d.c.e. degree d > 0 , the class of its c.e. predecessors in which d is c.e., denoted as R [d]...

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Veröffentlicht in:	Archive for mathematical logic 2013-11, Vol.52 (7-8), p.733-741
Hauptverfasser:	Fang, Chengling, Wu, Guohua, Yamaleev, Mars
Format:	Artikel
Sprache:	eng
Schlagworte:	Algebra Mathematical analysis Mathematical Logic and Foundations Mathematical problems Mathematics Mathematics and Statistics Theorems
Online-Zugang:	Volltext
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