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A Comparative Study of Some Central Notions of ASPIC+ and DeLP

Published online by Cambridge University Press:  10 October 2019

ALEJANDRO J. GARCÍA
Affiliation:
Institute for Computer Science and Engineering (CONICET-UNS), Department of Computer Science & Engineering, Universidad Nacional del Sur, Bahia Blanca, Argentina (e-mail: [email protected])
HENRY PRAKKEN
Affiliation:
Department of Information and Computing Sciences, Utrecht University & Faculty of Law, University of Groningen, Utrecht & Groningen, The Netherlands (e-mail: [email protected])
GUILLERMO R. SIMARI
Affiliation:
Institute for Computer Science and Engineering (CONICET-UNS), Department of Computer Science & Engineering, Universidad Nacional del Sur, Bahia Blanca, Argentina (e-mail: [email protected])
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Abstract

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This paper formally compares some central notions from two well-known formalisms for rule-based argumentation, DeLP and ASPIC+. The comparisons especially focus on intuitive adequacy and inter-translatability, consistency, and closure properties. As for differences in the definitions of arguments and attack, it turns out that DeLP’s definitions are intuitively appealing but that they may not fully comply with Caminada and Amgoud’s rationality postulates of strict closure and indirect consistency. For some special cases, the DeLP definitions are shown to fare better than ASPIC+. Next, it is argued that there are reasons to consider a variant of DeLP with grounded semantics, since in some examples its current notion of warrant arguably has counterintuitive consequences and may lead to sets of warranted arguments that are not admissible. Finally, under some minimality and consistency assumptions on ASPIC+ arguments, a one-to-many correspondence between ASPIC+ arguments and DeLP arguments is identified in such a way that if the DeLP warranting procedure is changed to grounded semantics, then ’s DeLP notion of warrant and ASPIC+ ’s notion of justification are equivalent. This result is proven for three alternative definitions of attack.

Type
Original Article
Creative Commons
Creative Common License - CCCreative Common License - BY
This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.
Copyright
Copyright © Cambridge University Press 2019

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