How To Efficiently Implement An OSHL-Based Automatic Theorem Prover

Xu, Hao

How To Efficiently Implement An OSHL-Based Automatic Theorem Prover Public Deposited

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March 21, 2019

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Xu, Hao
- Affiliation: College of Arts and Sciences, Department of Computer Science

Abstract

Ordered Semantic Hyper-linking (OSHL) is a general-purpose instance-based first-order automated theorem proving algorithm. Although OSHL has many useful properties, previous implementations of OSHL were not very efficient. The implementation of such a theorem prover differs from other more traditional programs in that a lot of its subroutines are more mathematical than procedural. The low performance of previous implementations prevents us from evaluating how the proof strategy used in OSHL matches up against other theorem proving strategies. This dissertation addresses this problem on three levels. First, an abstract, generalized version genOSHL is defined which captures the essential features of OSHL and for which the soundness and completeness are proved. This gives genOSHL the flexibility to be tweaked while still preserving soundness and completeness. A type inference algorithm is introduced which allows genOSHL to possibly reduce its search space while still preserving the soundness and completeness. Second, incOSHL, a specialized version of genOSHL, which differs from the original OSHL algorithm, is defined by specializing genOSHL. Its soundness of completeness follows from that of genOSHL. Third, an embedded programming language called STACK EL, which allows managing program states and their dependencies on global mutable data, is designed and implemented. STACK EL allows our prover to generate instances incrementally. We also study the performance of our incremental theorem prover that implements incOSHL.

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