Software model-checking based on the CEGAR framework can be made more precise by separating non-determinism from the lack of information due to abstraction. The two can be modeled individually using four-valued Belnap logic. In addition, this logic allows reasoning about negations effectively and thus enables checking of full CTL. In this paper, we present Yasm – a new symbolic software model-checker. Preliminary experience with Yasm shows that our implementation can effectively construct and analyze Belnap models without a substantial overhead when compared to its classical counterparts.


Model Check Transition Relation Atomic Proposition Kripke Structure Control Flow Graph 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer-Verlag Berlin Heidelberg 2006

Authors and Affiliations

  • Arie Gurfinkel
    • 1
  • Marsha Chechik
    • 1
  1. 1.Department of Computer ScienceUniversity of TorontoTorontoCanada

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