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Propositional relevance through letter-sharing: review and contribution

Makinson, David C. (2007) Propositional relevance through letter-sharing: review and contribution. In: Bonanno, Giacomo, Delgrande, James, Lang, Jerome and Rott, Hans, (eds.) Formal Models of Belief Change in Rational Agents. Dagstuhl Seminar Proceedings(07351). Internationales Begegnungs und Forschungszentrum fur Informatik (IBFI), Dagstuhl, Germany.

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The concept of relevance between classical propositional formulae, defined in terms of letter-sharing, has been around for a very long time. But it began to take on a fresh life in 1999 when it was reconsidered in the context of the logic of belief change. Two new ideas appeared in independent work of Odinaldo Rodrigues and Rohit Parikh. First, the relation of relevance was considered modulo the belief set under consideration, Second, the belief set was put in a canonical form, known as its finest splitting. In this paper we explain these ideas; relate the approaches of Rodrigues and Parikh to each other; and briefly report some recent results of Kourousias and Makinson on the extent to which AGM belief change operations respect relevance. Finally we suggest a further refinement of the notion of relevance by introducing a parameter that allows one to take epistemic as well as purely logical components into account.

Item Type: Book Section
Official URL:
Additional Information: © 2007 IBFI
Library of Congress subject classification: B Philosophy. Psychology. Religion > B Philosophy (General)
B Philosophy. Psychology. Religion > BC Logic
Sets: Departments > Philosophy, Logic and Scientific Method
Identification Number: urn:nbn:de:0030-drops-12124
Date Deposited: 13 Feb 2008

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