Abstract
To relieve the state space explosion problem, and accelerate the speed of model checking, this paper introduces the concept of finite precision timed automata (FPTAs) and proposes a data structure to represent its symbolic states. FPTAs only record the integer values of clock variables together with the order of their most recent resets to reduce the state space. The constraints under which the reachability checking of a timed automaton can be reduced to that of the corresponding FPTA are provided, and then an algorithm for reachability analysis is presented. Finally, the paper presents some preliminary experimental results, and analyzes the advantages and disadvantages of the new data structure.
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