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» On self-embeddings of computable linear orderings
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APAL
2006
75views more  APAL 2006»
13 years 5 months ago
On self-embeddings of computable linear orderings
The Dushnik
Rodney G. Downey, Carl G. Jockusch Jr., Joseph S. ...
ORDER
2007
79views more  ORDER 2007»
13 years 4 months ago
Computable Linearizations of Well-partial-orderings
Abstract. We analyze results on well-partial-orderings from the viewpoint of computability theory, and we answer a question posed by Diana Schmidt. We obtain the following results....
Antonio Montalbán
CORR
2007
Springer
116views Education» more  CORR 2007»
13 years 4 months ago
Complexity of some Path Problems in DAGs and Linear Orders
We investigate here the computational complexity of three natural problems in directed acyclic graphs. We prove their NP Completeness and consider their restrictions to linear orde...
Serge Burckel
NDJFL
1998
81views more  NDJFL 1998»
13 years 4 months ago
An Undecidable Linear Order That Is n-Decidable for All n
A linear order is n-decidable if its universe is N and the relations determined by n formulas are uniformly computable. This means that there is a computable procedure which, when ...
John Chisholm, Michael Moses