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TCS
2002
13 years 10 months ago
Presentations of computably enumerable reals
We study the relationship between a computably enumerable real and its presentations: ways of approximating the real by enumerating a prefix-free set of binary strings.
Rodney G. Downey, Geoffrey LaForte
APAL
2005
88views more  APAL 2005»
13 years 10 months ago
Completing pseudojump operators
We investigate operators which take a set X to a set relatively computably enumerable in and above X by studying which such sets X can be so mapped into the Turing degree of K. We...
Richard Coles, Rodney G. Downey, Carl G. Jockusch ...
ENTCS
2007
91views more  ENTCS 2007»
13 years 11 months ago
A Cappable Almost Everywhere Dominating Computably Enumerable Degree
We show that there exists an almost everywhere (a.e.) dominating computably enumerable (c.e.) degree which is half of a minimal pair.
George Barmpalias, Antonio Montalbán
SYNASC
2005
IEEE
86views Algorithms» more  SYNASC 2005»
14 years 4 months ago
One and Two Polarizations, Membrane Creation and Objects Complexity in P Systems
We improve, by using register machines, some existing universality results for specific models of P systems. P systems with membrane creation are known to generate all recursivel...
Artiom Alhazov, Rudolf Freund, Agustin Riscos-N&ua...