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Forcing Monotonicity in Parameterized Verification: From Multisets to Words

By Parosh Aziz Abdulla


Abstract. We present a tutorial on verification of safety properties for parameterized systems. Such a system consists of an arbitrary number of processes; the aim is to prove correctness of the system regardless of the number of processes inside the system. First, we consider a class of parameterized systems whose behaviours can be captured exactly as Petri nets using counter abstraction. This allows analysis using the framework of monotonic transition systems introduced in [1]. Then, we consider parameterized systems for which there is no natural ordering which allows monotonicity. We describe the method of monotonic abstraction which provides an over-approximation of the transition system. We consider both systems where the over-approximation gives rise to reset Petri nets, and systems where the abstract transition relation is a set of rewriting rules on words over a finite alphabet.

Year: 2011
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