Are tableaux an improvement on truth-tables?

Abstract
We show that Smullyan's analytic tableaux cannot p-simulate the truth-tables. We identify the cause of this computational breakdown and relate it to an underlying semantic difficulty which is common to the whole tradition originating in Gentzen's sequent calculus, namely the dissonance between cut-free proofs and the Principle of Bivalence. Finally we discuss some ways in which this principle can be built into a tableau-like method without affecting its analytic nature.
Keywords tableaux  truth-tables  computational complexity  theorem-proving
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    References found in this work BETA
    Raymond M. Smullyan (1968). First-Order Logic. New York [Etc.]Springer-Verlag.
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