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On a Logico-Algebraic Approach to AGM Belief Contraction Theory

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Abstract

In this paper we investigate AGM belief contraction operators by using the tools of algebraic logic. We generalize the notion of contraction to arbitrary finitary propositional logics, and we show how to switch from a syntactic-based approach to a semantic one. This allows to build a solid bridge between the validity of AGM postulates in a propositional logic and specific algebraic properties of its intended algebraic counterpart. Such a connection deserves particular attention when we deal with maxichoice contractions, as studied in the final part of the paper.

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Acknowledgments

We thank Hector Freytes, Roberto Giuntini, Antonio Ledda, Francesco Paoli, Antonino Salibra and Giuseppe Sergioli for the insightful discussions on the topics of the present paper. We also thank an anonymous referee for the significant suggestions which helped to improve the paper. The authors gratefully acknowledge the following funding sources: Regione Autonoma della Sardegna, within the project “Per un’estensione semantica della Logica Computazionale Quantistica - Impatto teorico e ricadute implementative”, RAS: SR40341; MIUR, project PRIN 2017 “Theory and applications of resource sensitive logics”, CUP: 20173WKCM5; “Logic and cognition. Theory, experiments, and applications”, CUP: 2013YP4N3; Fondazione di Sardegna, within the project “Resource sensitive reasoning and logic ”, CUP: F72F20000410007.

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Correspondence to M. Pra Baldi.

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Fazio, D., Pra Baldi, M. On a Logico-Algebraic Approach to AGM Belief Contraction Theory. J Philos Logic 50, 911–938 (2021). https://doi.org/10.1007/s10992-020-09587-0

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