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Definability and Computability for PRSPDL

PRSPDL is a variant of PDL with parallel composition. In the Kripke models in which PRSPDL-formulas are evaluated, states have an internal structure. We devote this paper to the definability issue of several classes of frames by means of the language of PRSPDL and to the computability issue of PRSPDL-validity for various fragments of the PRSPDL-language and for various classes of PRSPDL-frames.