Abstract
This paper studies an abduction problem in formal argumentation frameworks. Given an argument, an agent verifies whether the argument is justified or not in its argumentation framework. If the argument is not justified, the agent seeks conditions to explain the argument in its argumentation framework. We formulate such abductive reasoning in argumentation semantics and provide its computation in logic programming. Next we apply abduction in argumentation frameworks to reasoning by players in debate games. In debate games, two players have their own argumentation frameworks and each player builds claims to refute the opponent. A player may provide false or inaccurate arguments as a tactic to win the game. We show that abduction is used not only for seeking counter-claims but also for building dishonest claims in debate games.
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Notes
- 1.
A reviewer comments that “an argument \(A\) attacking itself is a very natural explanation for the observation that there is evidence against \(A\), i.e. that \(A\) is out.” However, \(A\)’s attacking itself does not explain that “\(A\) is out” but explains that “\(A\) is not in.” In fact, \(A\) is labelled \(\mathtt{undec}\) in \(AF=(\{A\},\{(A,A)\})\) under the complete, semi-stable, grounded and preferred semantics. We exclude such “undecided” observations. (\(AF\) has no stable labelling.)
- 2.
We refer the readers to the references in [11] for the precise definition of each semantics.
- 3.
We use the notion of (dis)honest claims based on credulous justification under the complete labelling in [26], while alternative definitions are considered based on skeptical justification or different labellings.
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Sakama, C. (2014). Abduction in Argumentation Frameworks and Its Use in Debate Games. In: Nakano, Y., Satoh, K., Bekki, D. (eds) New Frontiers in Artificial Intelligence. JSAI-isAI 2013. Lecture Notes in Computer Science(), vol 8417. Springer, Cham. https://doi.org/10.1007/978-3-319-10061-6_19
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