Abstract

Branching-time temporal logics have proved to be an extraordinarily successful tool in the formal specification and verification of distributed systems. Much of this recent success stems from the tractability of the model checking problem for the branching time logic CTL. Several successful verification tools (of which SMV is the best known) have been implemented that allow designers to verify that systems satisfy requirements expressed in CTL. Recently, CTL was generalized by Alur, Henzinger, and Kupferman in a logic known as Temporal (ATL). The key insight in ATL is that the path quantifiers of CTL could be replaced by cooperation of the form ? G ?, where G is a set of agents. The intended interpretation of an ATL formula ? G ? ? is that the agents G can cooperate to ensure that ? holds (equivalently, that G have a winning strategy for ?). It turns out that the resulting logic very naturally generalizes and extends CTL. In this talk, I will discuss extensions to ATL with knowledge modalities, of the kind made popular by the work of Fagin, Halpern, Moses, and Vardi. Combining these knowledge modalities with ATL, it becomes possible to express such properties as group G can cooperate to bring about ? iff it is common knowledge in G that ?. The resulting logic - Alternating-time Temporal Epistemic Logic (ATEL) - has a range of applications, which will be discussed in the talk. In addition, I will relate some preliminary experiments with ATEL model checking, which shares the tractability property of its ancestor CTL. (This talk reports joint work with Wiebe van der Hoek.)

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call

Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.