Simplified Lower Bounds for Propositional Proofs

Notre Dame Journal of Formal Logic 37 (4):523-544 (1996)
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Abstract

This article presents a simplified proof of the result that bounded depth propositional proofs of the pigeonhole principle are exponentially large. The proof uses the new techniques for proving switching lemmas developed by Razborov and Beame. A similar result is also proved for some examples based on graphs

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Alasdair Urquhart
University of Toronto, St. George Campus

Citations of this work

Partially definable forcing and bounded arithmetic.Albert Atserias & Moritz Müller - 2015 - Archive for Mathematical Logic 54 (1):1-33.
Matrix identities and the pigeonhole principle.Michael Soltys & Alasdair Urquhart - 2004 - Archive for Mathematical Logic 43 (3):351-357.

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