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Resolution with Symmetry Rule Applied to Linear Equations

Authors Pascal Schweitzer, Constantin Seebach

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Author Details

Pascal Schweitzer
  • TU Kaiserslautern, Germany
Constantin Seebach
  • TU Kaiserslautern, Germany

Funding

The research leading to these results has received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (EngageS: grant agreement No. 820148).

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Pascal Schweitzer and Constantin Seebach. Resolution with Symmetry Rule Applied to Linear Equations. In 38th International Symposium on Theoretical Aspects of Computer Science (STACS 2021). Leibniz International Proceedings in Informatics (LIPIcs), Volume 187, pp. 58:1-58:16, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2021) https://doi.org/10.4230/LIPIcs.STACS.2021.58

Abstract

This paper considers the length of resolution proofs when using Krishnamurthy’s classic symmetry rules. We show that inconsistent linear equation systems of bounded width over a fixed finite field 𝔽_p with p a prime have, in their standard encoding as CNFs, polynomial length resolutions when using the local symmetry rule (SRC-II).
As a consequence it follows that the multipede instances for the graph isomorphism problem encoded as CNF formula have polynomial length resolution proofs. This contrasts exponential lower bounds for individualization-refinement algorithms on these graphs.
For the Cai-Fürer-Immerman graphs, for which Torán showed exponential lower bounds for resolution proofs (SAT 2013), we also show that already the global symmetry rule (SRC-I) suffices to allow for polynomial length proofs.

Subject Classification

ACM Subject Classification
  • Theory of computation → Proof complexity
Keywords
  • Logical Resolution
  • Symmetry Rule
  • Linear Equation System

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References

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