Sharpened lower bounds for cut elimination
Samuel R. Buss
Source: J. Symbolic Logic Volume 77, Issue 2
(2012), 656-668.
Abstract
We present sharpened lower bounds on the size of cut free proofs for first-order logic. Prior lower bounds for eliminating cuts from a proof established superexponential lower bounds as a stack of exponentials, with the height of the stack proportional to the maximum depth d of the formulas in the original proof. Our results remove the constant of proportionality, giving an exponential stack of height equal to d-O(1). The proof method is based on more efficiently expressing the Gentzen—Solovay cut formulas as low depth formulas.
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