Abstract
Process rewrite systems (PRS) are widely accepted as a formalism for the description of infinite-state systems. It is known that the reachability problem for PRS is decidable. The problem becomes undecidable when PRS are extended with a finite-state control unit. In this paper, we show that the problem remains decidable when PRS are extended with a weak (i.e. acyclic except for self-loops) finite-state control unit. We also present some applications of this decidability result.
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