The method of the yu–ding theorem and its application

  • Authors:
  • Yun Fan

  • Affiliations:
  • Department of mathematics, nanjing university, china and department of mathematics, southeast university, china email: fanyun1234@hotmail.com

  • Venue:
  • Mathematical Structures in Computer Science
  • Year:
  • 2009

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Abstract

We begin by reviewing the major results dealing with the structure of the cl-degrees, and then focus on the method of the Yu–Ding Theorem, which is an important result in this area. By strengthening the Yu–Ding procedure, we construct a cl-cuppable cl-degree of c.e. sets.