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Probabilistic Argumentation: An Approach Based on Conditional Probability –A Preliminary Report–

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Logics in Artificial Intelligence (JELIA 2021)

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Abstract

A basic form of an instantiated argument is as a pair (support, conclusion) standing for a conditional relation ‘if support then conclusion’. When this relation is not fully conclusive, a natural choice is to model the argument strength with the conditional probability of the conclusion given the support. In this paper, using a very simple language with conditionals, we explore a framework for probabilistic logic-based argumentation based on an extensive use of conditional probability, where uncertain and possibly inconsistent domain knowledge about a given scenario is represented as a set of defeasible rules quantified with conditional probabilities. We then discuss corresponding notions of attack and defeat relations between arguments, providing a basis for appropriate acceptability semantics, e.g. based on extensions or on DeLP-style dialogical trees.

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Notes

  1. 1.

    Since there is no place to confusion, we will use the same symbol P to denote the probability distribution over \(\varOmega \) and its associated probability over Fm.

  2. 2.

    According to \(\vdash \).

  3. 3.

    Standing for factual or conditioned arguments.

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Acknowledgments

The authors acknowledge partial support by the Spanish projects TIN2015-71799-C2-1-P and PID2019-111544GB-C21.

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Correspondence to Pilar Dellunde .

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Dellunde, P., Godo, L., Vidal, A. (2021). Probabilistic Argumentation: An Approach Based on Conditional Probability –A Preliminary Report–. In: Faber, W., Friedrich, G., Gebser, M., Morak, M. (eds) Logics in Artificial Intelligence. JELIA 2021. Lecture Notes in Computer Science(), vol 12678. Springer, Cham. https://doi.org/10.1007/978-3-030-75775-5_3

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  • DOI: https://doi.org/10.1007/978-3-030-75775-5_3

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