Abstract

We study the problem of using monadic second order (MSO) logic to reason about certain distributed infinite state systems that communicate by exchanging messages. The success of MONA [6] and similar tools shows that a nonelementary worst-case complexity of MSO logic is not relevant in the practice of model checking. Indeed, MSO logic enjoys a satisfactory expressive power for many applications since it subsumes many temporal and program logics. Towards obtaining decidable MSO theory, we consider systems that are not explicitly product-based but, still have an underlying component-based structure.

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