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Complexity of propositional projection temporal logic with star. (English) Zbl 1161.03008
Summary: This paper investigates the complexity of Propositional Projection Temporal Logic with Star (PPTL$^*$). To this end, Propositional Projection Temporal Logic (PPTL) is first extended to include projection star. Then, by reducing the emptiness problem of star-free expressions to the problem of the satisfiability of PPTL$^*$ formulas, the lower bound of the complexity for the satisfiability of PPTL$^*$ formulas is proved to be non-elementary. Then, to prove the decidability of PPTL$^*$, the normal form, normal form graph (NFG) and labelled normal form graph (LNFG) for PPTL$^*$ are defined. Also, algorithms for transforming a formula to its normal form and LNFG are presented. Finally, a decision algorithm for checking the satisfiability of PPTL$^*$ formulas is formalised using LNFGs.

03B44Temporal logic
03B25Decidability of theories; sets of sentences
68Q60Specification and verification of programs
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