On the unification problem for GLP

Lev D. Beklemishev

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arXiv · 2404.04893

On the unification problem for GLP

Lev D. Beklemishev

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Abstract

We show that the polymodal provability logic GLP, in a language with at least two modalities and one variable, has nullary unification type. More specifically, we show that the formula [1]p does not have maximal unifiers, and exhibit an infinite complete set of unifiers for it. Further, we discuss the algorithmic problem of whether a given formula is unifiable in GLP and remark that this problem has a positive solution. Finally, we state the arithmetical analogues of the unification and admissibility problems for GLP and formulate a number of open questions.

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BibTeX RIS

Lev D. Beklemishev. 2024-04-07. On the unification problem for GLP. https://arxiv.org/abs/2404.04893

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