Flattability of Priority Vector Addition Systems

Author Roland Guttenberg



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Roland Guttenberg
  • Technical University of Munich, Germany

Acknowledgements

I thank my PhD advisor Javier Esparza for reading a first draft and providing feedback. I thank the anonymous reviewers for their helpful feedback.

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Roland Guttenberg. Flattability of Priority Vector Addition Systems. In 51st International Colloquium on Automata, Languages, and Programming (ICALP 2024). Leibniz International Proceedings in Informatics (LIPIcs), Volume 297, pp. 141:1-141:20, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2024)
https://doi.org/10.4230/LIPIcs.ICALP.2024.141

Abstract

Vector addition systems (VAS), also known as Petri nets, are a popular model of concurrent systems. Many problems from many areas reduce to the reachability problem for VAS, which consists of deciding whether a target configuration of a VAS is reachable from a given initial configuration. One of the main approaches to solve the problem on practical instances is called flattening, intuitively removing nested loops. This technique is known to terminate for semilinear VAS due to [Jérôme Leroux, 2013]. In this paper, we prove that also for VAS with nested zero tests, called Priority VAS, flattening does in fact terminate for all semilinear reachability relations. Furthermore, we prove that Priority VAS admit semilinear inductive invariants. Both of these results are obtained by defining a well-quasi-order on runs of Priority VAS which has good pumping properties.

Subject Classification

ACM Subject Classification
  • Theory of computation → Logic and verification
Keywords
  • Priority Vector Addition Systems
  • Semilinear
  • Inductive Invariants
  • Geometry
  • Flattability
  • Almost Semilinear
  • Transformer Relation

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