Local structure theory and the Ershov hierarchy

This thesis is concerned with three special properties of Turing degree structure and the Ershov hierarchy. We study the distributions of the nonhemimaximal c.e. degrees, noncomputable left c.e. reals with only computable presentations, and the cupping property in the Ershov hierarchy. A general int...

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Bibliographic Details
Main Author: Fang, Chengling
Other Authors: Wu Guohua
Format: Theses and Dissertations
Language:English
Published: 2012
Subjects:
Online Access:https://hdl.handle.net/10356/48687
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Institution: Nanyang Technological University
Language: English