Rank complexity gap for Lovász-Schrijver and Sherali-Adams proof systems
Rank complexity gap for Lovász-Schrijver and Sherali-Adams proof systems
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Lovász-Schrijver 和 Sherali-Adams 证明系统的等级复杂度差距
DOI:
10.1007/s00037-012-0049-1
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发表时间:
2012
影响因子:
1.4
通讯作者:
Dantchev S
中科院分区:
文献类型:
--
作者:
Dantchev S
We prove a dichotomy theorem for the rank of propositional contradictions, uniformly generated from first-order sentences, in both the Lovász-Schrijver (LS) and Sherali-Adams (SA) refutation systems. More precisely, we first show that the propositional translations of first-order formulae that are universally false, that is, fail in all finite and infinite models, have LS proofs whose rank is constant, independent of the size of the (finite) universe. In contrast to that, we prove that the propositional formulae that fail in all finite models, but hold in some infinite structure, require proofs whose SA rank grows polynomially with the size of the universe.Until now, this kind of so-called complexity gap theorem has been known for tree-like Resolution and, in somehow restricted forms, for the Resolution and Nullstellensatz systems. As far as we are aware, this is the first time the Sherali-Adams lift-and-project method has been considered as a propositional refutation system (since the conference version of this paper, SA has been considered as a refutation system in several further papers). An interesting feature of the SA system is that it simulates LS, the Lovász-Schrijver refutation system without semi-definite cuts, in a rank-preserving fashion.
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DOI:
--
发表时间:
2007
期刊:
SIAM journal on computing (Print)
影响因子:
--
作者:
P. Beame;T. Pitassi;Nathan Segerlind
通讯作者:
Nathan Segerlind
DOI:
--
发表时间:
2001
期刊:
Scientific Annals of Cuza University
影响因子:
--
作者:
S. Andrei;G. Grigoraș;M. Kudlek;Cristian Masalagiu
通讯作者:
Cristian Masalagiu
DOI:
--
发表时间:
2009
期刊:
Symposium on the Theory of Computing
影响因子:
--
作者:
Claire Mathieu;A. Sinclair
通讯作者:
A. Sinclair
DOI:
--
发表时间:
2008
期刊:
2008 23rd Annual IEEE Symposium on Logic in Computer Science
影响因子:
--
作者:
Søren Riis
通讯作者:
Søren Riis
影响因子:
1.4
作者:
Søren Riis
通讯作者:
Søren Riis