Abstract
In this paper we concentrate mainly on the notion of β-pregroups, which are pregroups (first introduced by Lambek [18] in 1999) enriched with modality operators. β-pregroups were first proposed by Fadda [11] in 2001. The motivation to introduce them was to limit (locally) the associativity in the calculus considered. In this paper we present this new calculus in the form of a rewriting system, prove the very important feature of this system - that in a given derivation the non-expanding rules must always proceed non-contracting ones in order the derivation to be minimal (normalization theorem). We also propose a sequent system for this calculus and prove the cut elimination theorem for it. As an illustration we show how to use β-pregroups for linguistical applications.
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Special Issue Categorial Grammars and Pregroups Edited by Wojciech Buszkowski and Anne Preller
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Kiślak-Malinowska, A. On the Logic of β-pregroups. Stud Logica 87, 323–342 (2007). https://doi.org/10.1007/s11225-007-9090-5
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DOI: https://doi.org/10.1007/s11225-007-9090-5