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» Denotations for Classical Proofs - Preliminary Results
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JSYML
2011
84views more  JSYML 2011»
13 years 2 months ago
On the non-confluence of cut-elimination
Abstract. Westudy cut-elimination in first-orderclassical logic. Weconstructa sequenceofpolynomiallength proofs having a non-elementary number of different cut-free normal forms....
Matthias Baaz, Stefan Hetzl
DAGSTUHL
2003
13 years 9 months ago
Why Timed Sequence Diagrams Require Three-Event Semantics
STAIRS is an approach to the compositional development of sequence diagrams supporting the specification of mandatory as well as potential behavior. In order to express the necess...
Øystein Haugen, Knut Eilif Husa, Ragnhild K...
APAL
2010
85views more  APAL 2010»
13 years 7 months ago
Elementary differences between the degrees of unsolvability and degrees of compressibility
Given two infinite binary sequences A, B we say that B can compress at least as well as A if the prefix-free Kolmogorov complexity relative to B of any binary string is at most as ...
George Barmpalias
FOCS
2007
IEEE
14 years 1 months ago
Parameterized Proof Complexity
We propose a proof-theoretic approach for gaining evidence that certain parameterized problems are not fixedparameter tractable. We consider proofs that witness that a given prop...
Stefan S. Dantchev, Barnaby Martin, Stefan Szeider
ECCC
2007
90views more  ECCC 2007»
13 years 7 months ago
Parameterized Proof Complexity: a Complexity Gap for Parameterized Tree-like Resolution
We propose a proof-theoretic approach for gaining evidence that certain parameterized problems are not fixed-parameter tractable. We consider proofs that witness that a given pro...
Stefan S. Dantchev, Barnaby Martin, Stefan Szeider