Abstract
The present article employs a model-theoretic semantics to interpret a fragment of the language of the Quantified Argument Calculus (\(\mathsf {Quarc}\)), a recently introduced logical system whose main aim is capturing the structure of natural language sentences in a closer way than does the language of classical logic. The main contribution is an axiomatization for the set of formulas that are valid in all standard interpretations within the employed semantics.
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Notes
In Pavlović and Gratzl (forthcoming) it is shown that both predication negation and reordered predicates can be eliminated from \(\mathsf {Quarc}\), since formulas involving these devices are logically equivalent to formulas not involving them, which are said to be in “shallow normal form”.
It is important to point out that when \(c\in SA\) and c is not a name for x in I, there is no \(I_{c\rightarrow x}\) expansion of I.
Raab employs in (Raab , 2016) two semantic operations that are closely related to the rearrangements and the expansions defined here; for analogies and differences, see his Definitions 4.3.3 and 4.3.8.
In principle, a formula \(\phi\) may occur more than once as an assumption in a derivation \({\mathcal {D}}\). Discharging \(\phi\) in \({\mathcal {D}}\) here means discharging all occurrences of \(\phi\) as an assumption in \({\mathcal {D}}\).
We would like to point out that if A9 is reformulated in such a way that \(n\ge 0\), then A1 becomes an instance of it.
Since the domain of a predicate does not change across iterated expansions (see Definition 2), this also means \(x\in I'(P)\), for any \(I'\) which is obtained from I via a finite sequence of expansions. In particular, for the aims of the present argument, \(x\in I_{n-1}(P)\).
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Acknowledgements
The author would like to thank Hanoch Ben-Yami and Jonas Raab for their useful remarks on an earlier version of this work. Furthermore, he is grateful to the audience of a seminar held at Central European University in September 2021, as well as to the two anonymous reviewers for this journal, for their very helpful comments.
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Pascucci, M. An Axiomatic Approach to the Quantified Argument Calculus. Erkenn 88, 3605–3630 (2023). https://doi.org/10.1007/s10670-022-00519-9
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DOI: https://doi.org/10.1007/s10670-022-00519-9