Annals of Pure and Applied Logic 51 (3):173-214 (1991)

Abstract
The k-provability for an axiomatic system A is to determine, given an integer k 1 and a formula in the language of A, whether or not there is a proof of in A containing at most k lines. In this paper we develop a unification-theoretic method for investigating the k-provability problem for Parikh systems, which are first-order axiomatic systems that contain a finite number of axiom schemata and a finite number of rules of inference. We show that the k-provability problem for a Parikh system reduces to a unification problem that is essentially the unification problem for second-order terms. By solving various subproblems of this unification problem , we solve the k- probability problem for a variety of Parikh systems, including several formulations of Peano arithmetic. Our method for investigating the k-provability problem employs algorithms that compute and characterize unifiers. We give some examples of how these algorithms can be used to solve complexity problems other than the k-provability problem
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DOI 10.1016/0168-0072(91)90015-e
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References found in this work BETA

A Machine-Oriented Logic Based on the Resolution Principle.J. A. Robinson - 1966 - Journal of Symbolic Logic 31 (3):515-516.
On Me Number of Steps in Proofs.Jan Krajíèek - 1989 - Annals of Pure and Applied Logic 41 (2):153-178.
Sets of Theorems with Short Proofs.Daniel Richardson - 1974 - Journal of Symbolic Logic 39 (2):235-242.

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Citations of this work BETA

The Undecidability of K-Provability.Samuel R. Buss - 1991 - Annals of Pure and Applied Logic 53 (1):75-102.
Bounded Arithmetic, Proof Complexity and Two Papers of Parikh.Samuel R. Buss - 1999 - Annals of Pure and Applied Logic 96 (1-3):43-55.
A Note on the Length of Proofs.Tsuyoshi Yukami - 1994 - Annals of the Japan Association for Philosophy of Science 8 (4):203-209.

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