Complexity Theory Complexity Theory
نویسنده
چکیده
QSAT (QBF) INSTANCE: Boolean expression φ in CNF with variables x1, . . . , xn. QUESTION: Is there a truth value for the variable x1 such that for both truth values of x2 there is a truth value for x3 and so on up to xn, such that φ is satisfied by the overall truth assignment? Notation An instance of QSAT is written as ∃x1∀x2∃x3 · · ·Qxnφ, where Q is ∀ if n is even and ∃ if n is odd. Theorem QSAT is PSPACE-complete.
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