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<div class="csl-entry">Dvořák, W., Rapberger, A., & Woltran, S. (2023). A claim-centric perspective on abstract argumentation semantics: Claim-defeat, principles, and expressiveness. <i>Artificial Intelligence</i>, <i>324</i>, Article 104011. https://doi.org/10.1016/j.artint.2023.104011</div>
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dc.identifier.issn
0004-3702
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dc.identifier.uri
http://hdl.handle.net/20.500.12708/191695
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dc.description.abstract
Dung's abstract argumentation frameworks (AFs) are a key formalism in AI research nowadays. Claims are an inherent part of each argument; they substantially determine the structure of the abstract representation. Nevertheless, they are often not taken into account on the abstract level, which restricts the modeling capacities of AFs to problems that do not involve claims in the evaluation. In this work, we address this shortcoming and conduct a structural analysis of claim-based argumentation semantics utilizing claim-augmented argumentation frameworks (CAFs) which extend AFs by assigning a claim to each argument. Our main contributions are as follows: We first propose novel variants for preferred, naive, stable, semi-stable, and stage semantics based on claim-defeat and claim-set maximization, complementing existing CAF semantics. Among our findings is that for a certain subclass, namely well-formed CAFs, the different versions of preferred and stable semantics coincide, which is not the case for the other semantics. We then conduct a principle-based analysis of the semantics with respect to general and well-formed CAFs. Finally, we study the expressiveness of the semantics by characterizing their signatures. In summary, this paper provides a thorough analysis of fundamental properties of abstract argumentation semantics (along the lines of existing results for AFs) but from the perspective of the claims the arguments represent. This shift of perspective provides novel results which we deem relevant when abstract argumentation is used in an instantiation-based setting.
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dc.description.sponsorship
FWF - Österr. Wissenschaftsfonds
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dc.description.sponsorship
WWTF Wiener Wissenschafts-, Forschu und Technologiefonds
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dc.language.iso
en
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dc.publisher
ELSEVIER
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dc.relation.ispartof
Artificial Intelligence
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dc.rights.uri
http://creativecommons.org/licenses/by/4.0/
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dc.subject
Argumentation semantics
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dc.subject
Claim-augmented argumentation frameworks
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dc.subject
Claim-based reasoning
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dc.subject
Expressiveness
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dc.subject
Principle-based analysis
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dc.subject
modeling capacities of AFs
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dc.subject
Semi-stable
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dc.subject
stage semantics
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dc.title
A claim-centric perspective on abstract argumentation semantics: Claim-defeat, principles, and expressiveness