View Item 
      •   Home
      • 1. Schools
      • College of Science
      • School of Physical and Mathematical Sciences (SPMS)
      • SPMS Journal Articles
      • View Item
      •   Home
      • 1. Schools
      • College of Science
      • School of Physical and Mathematical Sciences (SPMS)
      • SPMS Journal Articles
      • View Item
      JavaScript is disabled for your browser. Some features of this site may not work without it.
      Subject Lookup

      Browse

      All of DR-NTUCommunities & CollectionsTitlesAuthorsBy DateSubjectsThis CollectionTitlesAuthorsBy DateSubjects

      My Account

      Login

      Statistics

      Most Popular ItemsStatistics by CountryMost Popular Authors

      About DR-NTU

      Nonhemimaximal degrees and the high/low hierarchy

      Thumbnail
      Author
      Fang, Chengling
      Wu, Guohua
      Date of Issue
      2012
      School
      School of Physical and Mathematical Sciences
      Abstract
      After showing the downwards density of nonhemimaximal degrees, Downey and Stob continued to prove that the existence of a low₂, but not low, nonhemimaximal degree, and their proof uses the fact that incomplete m-topped degrees are low₂ but not low. As commented in their paper, the construction of such a nonhemimaximal degree is actually a primitive 0''' argument. In this paper, we give another construction of such degrees, which is a standard 0''-argument, much simpler than Downey and Stob's construction mentioned above.
      Subject
      DRNTU::Science::Mathematics::Mathematical logic
      Type
      Journal Article
      Series/Journal Title
      Journal of symbolic logic
      Collections
      • SPMS Journal Articles
      http://dx.doi.org/10.2178/jsl/1333566631
      Get published version (via Digital Object Identifier)

      Show full item record


      NTU Library, Nanyang Avenue, Singapore 639798 © 2011 Nanyang Technological University. All rights reserved.
      DSpace software copyright © 2002-2015  DuraSpace
      Contact Us | Send Feedback
      Share |    
      Theme by 
      Atmire NV
       

       


      NTU Library, Nanyang Avenue, Singapore 639798 © 2011 Nanyang Technological University. All rights reserved.
      DSpace software copyright © 2002-2015  DuraSpace
      Contact Us | Send Feedback
      Share |    
      Theme by 
      Atmire NV
       

       

      DCSIMG