Browsing by Author "Andrews U."

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  • Nondensity of double bubbles in the D.C.E. degrees 
    Andrews U.; Kuyper R.; Lempp S.; Soskova M.; Yamaleev M. (2017)
    © Springer International Publishing AG 2017.In this paper, we show that the so-called “double bubbles” are not downward dense in the d.c.e. degrees. Here, a pair of d.c.e. degrees d1 > d2 > 0 forms a double bubble if all ...
  • The complements of lower cones of degrees and the degree spectra of structures 
    Andrews U.; Cai M.; Kalimullin I.; Lempp S.; Miller J.; Montalbán A. (2016)
    © 2016, Association for Symbolic Logic.We study Turing degrees a for which there is a countable structure A whose degree spectrum is the collection {x: x ≰ a}. In particular, for degrees a from the interval [0ʹ, 0ʺ ], such ...

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