Symmetry and completeness in the analysis of parameterized systems

  • Authors:
  • Kedar S. Namjoshi

  • Affiliations:
  • Bell Labs

  • Venue:
  • VMCAI'07 Proceedings of the 8th international conference on Verification, model checking, and abstract interpretation
  • Year:
  • 2007

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Abstract

It is shown that the cutoff method--which summarizes a parameterized system by a finite set of its instances--is complete for proving safety properties. This implies completeness of other, less stringent, proof methods for parameterized verification. It is shown that the cutoff method is equivalent to determining a (parameterized) inductive invariant. The second part of the paper describes a new algorithm to construct universally quantified, parameterized inductive invariants. This algorithm is shown to compute the strongest invariant of a given shape, and is complete under certain conditions. A key observation is a previously unnoticed connection between inductiveness, small model theorems, and compositional analysis.