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Relative Nondeterministic Information Logic is EXPTIME-complete

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Demri S. , Orłowska E.

tom Vol. 75, nr 1-4

163-178

We define a relative version of the logic NIL introduced by Or owska, Pawlak and Vakarelov and we show that its satisfiability is not only decidable but also EXPTIME-complete. Such a logic combines two ingredients that are seldom present simultaneously in information logics: frame conditions involving more than one information relation and relative frames. The EXPTIMEupper bound is obtained by designing a well-suited decision procedure based on the nonemptiness problem of Büchi automata on infinite trees. The paper provides evidence that Büchi automata on infinite trees are crucial language acceptors even for relative information logics with multiple types of relations.