Abstract
In this paper, we introduce a resolution calculus extended by a function introduction rule and by a tautology introduction rule. As opposed to most resolution refinements where tautology deletion does not lengthen a refutation, removing tautologies may disable short refutations if extended resolution calculi are applied. Moreover, the introduction of tautologies may strengthen a resolution calculus augmented by function introduction. We compare resolution calculi extended by different function introduction rules w.r.t. refutation length.
This research was supported by the Federal Ministry for Research and Technology within the project TASSO under grant no. ITW 8900 C2.
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Egly, U. (1993). On different concepts of function introduction. In: Gottlob, G., Leitsch, A., Mundici, D. (eds) Computational Logic and Proof Theory. KGC 1993. Lecture Notes in Computer Science, vol 713. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0022565
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DOI: https://doi.org/10.1007/BFb0022565
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