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» Hardness Amplification in Proof Complexity
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SAT
2010
Springer
178views Hardware» more  SAT 2010»
13 years 11 months ago
Proof Complexity of Propositional Default Logic
Default logic is one of the most popular and successful formalisms for non-monotonic reasoning. In 2002, Bonatti and Olivetti introduced several sequent calculi for credulous and s...
Olaf Beyersdorff, Arne Meier, Sebastian Mülle...
ENTCS
2006
153views more  ENTCS 2006»
13 years 7 months ago
Automatic Complexity Analysis for Programs Extracted from Coq Proof
We describe an automatic complexity analysis mechanism for programs extracted from proofs carried out with the proof assistant Coq. By extraction, we mean the automatic generation...
Jean-Pierre Jouannaud, Weiwen Xu
AML
2011
204views Mathematics» more  AML 2011»
13 years 2 months ago
A note on propositional proof complexity of some Ramsey-type statements
Any valid Ramsey statement n −→ (k)2 2 can be encoded into a DNF formula RAM(n, k) of size O(nk) and with terms of size k 2 . Let rk be the minimal n for which the statement h...
Jan Krajícek
JACM
2006
99views more  JACM 2006»
13 years 7 months ago
Finding a maximum likelihood tree is hard
Abstract. Maximum likelihood (ML) is an increasingly popular optimality criterion for selecting evolutionary trees [Felsenstein 1981]. Finding optimal ML trees appears to be a very...
Benny Chor, Tamir Tuller
COCO
2005
Springer
89views Algorithms» more  COCO 2005»
14 years 1 months ago
Hardness of Max 3SAT with No Mixed Clauses
We study the complexity of approximating Max NME3SAT, a variant of Max 3SAT when the instances are guaranteed to not have any mixed clauses, i.e., every clause has either all its ...
Venkatesan Guruswami, Subhash Khot