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APAL
2011
14 years 4 months ago
Upper bounds on ideals in the computably enumerable Turing degrees
We study ideals in the computably enumerable Turing degrees, and their upper bounds. Every proper Σ0 4 ideal in the c.e. Turing degrees has an incomplete upper bound. It follows t...
George Barmpalias, André Nies
TCS
2012
13 years 5 months ago
Improved simulation of nondeterministic Turing machines
Abstract. The standard simulation of a nondeterministic Turing machine (NTM) by a deterministic one essentially searches a large boundeddegree graph whose size is exponential in th...
Subrahmanyam Kalyanasundaram, Richard J. Lipton, K...
ICIP
2005
IEEE
15 years 11 months ago
Block-based ordinal co-occurrence matrices for texture similarity evaluation
In this paper we introduce a block-based approach for ordinal co-occurrence matrices aimed at improving robustness of the basic ordinal co-occurrence. Earlier, we have introduced t...
Mari Partio, Bogdan Cramariuc, Moncef Gabbouj
65
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WOLLIC
2007
Springer
15 years 3 months ago
Hydra Games and Tree Ordinals
Hydra games were introduced by Kirby and Paris, for the formulation of a result which is independent from Peano arithmetic but depends on the transfinite structure of 0. Tree ordi...
Ariya Isihara
AMC
2006
131views more  AMC 2006»
14 years 9 months ago
How much can analog and hybrid systems be proved (super-)Turing
Church thesis and its variants say roughly that all reasonable models of computation do not have more power than Turing machines. In a contrapositive way, they say that any model ...
Olivier Bournez