Tomáš Vojnar

Abstraction Refinement and Antichains for Trace Inclusion of Infinite State Systems

RiSE will host a talk by Tomáš Vojnar on October 24, 2016

DATE:Monday, October 24, 2016
VENUE:Seminar room Zemanek, Favoritenstraße 9-11, 1040 Vienna


We consider data automata in the form of finite automata equipped with variables (counters or registers) ranging over infinite data domains. A trace of such a data automaton is an alternating sequence of alphabet symbols and values taken by the counters during an execution of the automaton. We address the problem of checking the inclusion between the sets of traces (data languages) recognized by such automata. Since the problem is undecidable in general, we give a semi-algorithm based on abstraction refinement, which is proved to be sound and complete modulo termination. Due to the undecidability of the trace inclusion problem, our procedure is not guaranteed to terminate. We have implemented our technique in a prototype tool and show promising results on several non-trivial examples.

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