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Paper detail

Model Checking Constraint LTL over Trees

Constraint automata are an adaptation of Büchi-automata that process data words where the data comes from some relational structure S. Every transition of such an automaton comes with constraints in terms of the relations of S. A transition can only be fired if the current and the next data values satisfy all constraints of this transition. These automata have been used in the setting where S is a linear order for deciding constraint LTL with constraints over S. In this paper, S is the infinitely branching infinite order tree T. We provide a PSPACE algorithm for emptiness of T-constraint automata. This result implies PSPACE-completeness of the satisfiability and the model checking problem for constraint LTL with constraints over T.

preprint2015arXivOpen access
Alexander KartzowThomas Weidner
Logic in Computer Science
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Alexander KartzowThomas Weidner

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