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Logical Foundations for Hybrid Type-Logical Grammars

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Abstract

This paper explores proof-theoretic aspects of hybrid type-logical grammars, a logic combining Lambek grammars with lambda grammars. We prove some basic properties of the calculus, such as normalisation and the subformula property and also present both a sequent and a proof net calculus for hybrid type-logical grammars. In addition to clarifying the logical foundations of hybrid type-logical grammars, the current study opens the way to variants and extensions of the original system, including but not limited to a non-associative version and a multimodal version incorporating structural rules and unary modes.

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Notes

  1. Linear Categorial Grammar (Mihaliček and Pollard 2012; Pollard 2015; Smith 2010; Mihaličik 2012; Martin 2013; Worth 2014) is the restriction of HTLG to the linear implication rules. LCG has been criticised (Muskens 2001; Kubota and Levine 2015) for licensing proofs parallel to the one in Fig. 3. Note that given the types (with \(X=np\multimap s\)) all lexical term assignments for this type overgenerate (Moot 2014), so this problem is not easily fixed.

  2. The rule for the \(/\) directly parallels that for \(\backslash \), modulo directionality.

  3. In case \(((\lambda x. M)\, N)\) is an \(\eta \) redex and we perform an \(\eta \) reduction on it, its trace must be of the form \(((\lambda x. (M'\, x))\, N')\), and the \(\eta \) redex of this term is identical to its \(\beta \) redex.

  4. As is usual in the lambda calculus, we do not distinguish alpha-equivalent lambda terms.

  5. For natural deduction, rule permutations are a problem only for the \(\bullet E\) and the \(\Diamond E\) rules.

  6. To ensure confluence of ‘/’ and ‘\(\backslash \)’ in the presence of \(\epsilon \) we can add the side condition to the [/I] and \([\backslash I]\) contractions that the component to which the par link is attached has at least one hypothesis other than the auxiliary conclusion of the par link. This forbids empty antecedent derivations and restores confluence.

  7. To avoid making the structure overly complicated, neither “studies” nor the tv hypothesis with which it is matched have been unfolded.

  8. We need to prove cut elimination for the multiplicative-additive logic for this to hold, which is rather simple extension of the cut elimination proof in Sect. 3.2.

  9. Although [Kubota and Levine (2020), Sect. 7.2] give a treatment of parasitic gapping assigning non-linear lambda terms to the empty string.

  10. An alternative would be to forbid Lambek calculus connectives in assignments to the empty string. In this case, the question of decidability would be open.

  11. A possible exception would be the treatment of discontinuous gapping of Kubota and Levine (2012, Sect. 3.2). However, we would need to carefully weigh the added complexity at the level of prosodic terms (and types) that type polymorphism would introduce at this level.

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Correspondence to Richard Moot.

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This is a significantly extended version of a paper presented at Formal Grammar 2019 (Moot and Stevens-Guille 2019). We thank the referees of Formal Grammar as well as the audience of the conference for their invaluable feedback. We also thank the referees of the Journal of Logic, Language and Information for their comments on this revised paper.

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Moot, R., Stevens-Guille, S.J. Logical Foundations for Hybrid Type-Logical Grammars. J of Log Lang and Inf 31, 35–76 (2022). https://doi.org/10.1007/s10849-021-09348-5

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