On the non-confluence of cut-elimination

Journal of Symbolic Logic 76 (1):313 - 340 (2011)
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We study cut-elimination in first-order classical logic. We construct a sequence of polynomial-length proofs having a non-elementary number of different cut-free normal forms. These normal forms are different in a strong sense: they not only represent different Herbrand-disjunctions but also differ in their propositional structure. This result illustrates that the constructive content of a proof in classical logic is not uniquely determined but rather depends on the chosen method for extracting it.



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Herbrand's theorem as higher order recursion.Bahareh Afshari, Stefan Hetzl & Graham E. Leigh - 2020 - Annals of Pure and Applied Logic 171 (6):102792.
On the form of witness terms.Stefan Hetzl - 2010 - Archive for Mathematical Logic 49 (5):529-554.
The Computational Content of Arithmetical Proofs.Stefan Hetzl - 2012 - Notre Dame Journal of Formal Logic 53 (3):289-296.

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References found in this work

Proof Theory and Logical Complexity.Helmut Pfeifer & Jean-Yves Girard - 1989 - Journal of Symbolic Logic 54 (4):1493.
Grundlagen der Mathematik II.D. Hilbert & P. Bernays - 1974 - Journal of Symbolic Logic 39 (2):357-357.

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