David Bourget (Western Ontario)
David Chalmers (ANU, NYU)
Rafael De Clercq
Jack Alan Reynolds
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Journal of Philosophical Logic 28 (5):501-547 (1999)
The problem of how to remove information from an agent's stock of beliefs is of paramount concern in the belief change literature. An inquiring agent may remove beliefs for a variety of reasons: a belief may be called into doubt or the agent may simply wish to entertain other possibilities. In the prominent AGM framework for belief change, upon which the work here is based, one of the three central operations, contraction, addresses this concern (the other two deal with the incorporation of new information). Makinson has generalised this work by introducing the notion of a withdrawal operation. Underlying the account proffered by AGM is the idea of rational belief change. A belief change operation should be guided by certain principles or integrity constraints in order to characterise change by a rational agent. One of the most noted principles within the context of AGM is the Principle of Informational Economy. However, adoption of this principle in its purest form has been rejected by AGM leading to a more relaxed interpretation. In this paper, we argue that this weakening of the Principle of Informational Economy suggests that it is only one of a number of principles which should be taken into account. Furthermore, this weakening points toward a Principle of Indifference. This motivates the introduction of a belief removal operation that we call severe withdrawal. We provide rationality postulates for severe withdrawal and explore its relationship with AGM contraction. Moreover, we furnish possible worlds and epistemic entrenchment semantics for severe withdrawals.
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References found in this work BETA
David K. Lewis (1973). Counterfactuals. Blackwell Publishers.
Carlos E. Alchourron & David Makinson (1982). On the Logic of Theory Change: Contraction Functions and Their Associated Revision Functions. Theoria 48 (1):14-37.
Sven Ove Hansson (1991). Belief Contraction Without Recovery. Studia Logica 50 (2):251 - 260.
Sten Lindström & Wlodek Rabinowicz (1991). Epistemic Entrenchment with Incomparabilities and Relational Belief Revision. In André Fuhrmann & Michael Morreau (eds.), The Logic of Theory Change. Springer
Citations of this work BETA
Anthony S. Gillies (2007). Counterfactual Scorekeeping. Linguistics and Philosophy 30 (3):329 - 360.
Eduardo Fermé & Sven Ove Hansson (2011). AGM 25 Years: Twenty-Five Years of Research in Belief Change. Journal of Philosophical Logic 40 (2):295 - 331.
Sven Ove Hansson (2008). Specified Meet Contraction. Erkenntnis 69 (1):31 - 54.
Richard Booth & Thomas Meyer (2010). Equilibria in Social Belief Removal. Synthese 177 (1):97 - 123.
Sebastian Enqvist (2010). Contraction in Interrogative Belief Revision. Erkenntnis 72 (3):315 - 335.
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