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When quoting this document, please refer to the following
DOI: 10.4230/LIPIcs.STACS.2010.2475
URN: urn:nbn:de:0030-drops-24753
URL: http://dagstuhl.sunsite.rwth-aachen.de/volltexte/2010/2475/
Hirsch, Edward A. ;
Itsykson, Dmitry
On Optimal Heuristic Randomized Semidecision Procedures, with Application to Proof Complexity
Abstract
The existence of a ($p$-)optimal propositional proof system is a major open question in (proof) complexity; many people conjecture that such systems do not exist. Kraj\'{\i}\v{c}ek and Pudl\'{a}k \cite{KP} show that this question is equivalent to the existence of an algorithm that is optimal\footnote{Recent papers \cite{Monroe}
call such algorithms \emph{$p$-optimal} while traditionally Levin's algorithm was called \emph{optimal}. We follow the older tradition. Also there is some mess in terminology here, thus please see formal definitions in Sect.~\ref{sec:prelim} below.} on all propositional tautologies. Monroe \cite{Monroe} recently gave a conjecture implying that such algorithm does not exist.
We show that in the presence of errors such optimal algorithms \emph{do} exist. The concept is motivated by the notion of heuristic algorithms. Namely, we allow the algorithm to claim a small number of false ``theorems'' (according to any polynomial-time samplable distribution on non-tautologies) and err with bounded probability on other inputs.
Our result can also be viewed as the existence of an optimal proof system in a class of proof systems obtained by generalizing automatizable proof systems.
BibTeX - Entry
@InProceedings{hirsch_et_al:LIPIcs:2010:2475,
author = {Edward A. Hirsch and Dmitry Itsykson},
title = {{On Optimal Heuristic Randomized Semidecision Procedures, with Application to Proof Complexity}},
booktitle = {27th International Symposium on Theoretical Aspects of Computer Science},
pages = {453--464},
series = {Leibniz International Proceedings in Informatics (LIPIcs)},
ISBN = {978-3-939897-16-3},
ISSN = {1868-8969},
year = {2010},
volume = {5},
editor = {Jean-Yves Marion and Thomas Schwentick},
publisher = {Schloss Dagstuhl--Leibniz-Zentrum fuer Informatik},
address = {Dagstuhl, Germany},
URL = {http://drops.dagstuhl.de/opus/volltexte/2010/2475},
URN = {urn:nbn:de:0030-drops-24753},
doi = {10.4230/LIPIcs.STACS.2010.2475},
annote = {Keywords: Propositional proof complexity, optimal algorithm}
}
Keywords: |
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Propositional proof complexity, optimal algorithm |
Collection: |
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27th International Symposium on Theoretical Aspects of Computer Science |
Issue Date: |
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2010 |
Date of publication: |
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09.03.2010 |