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  1. Levi Contractions and AGM Contractions: A Comparison.Sven Ove Hansson & Erik J. Olsson - 1995 - Notre Dame Journal of Formal Logic 36 (1):103-119.
    A representation theorem is obtained for contraction operators that are based on Levi's recent proposal that selection functions should be applied to the set of saturatable contractions, rather than to maximal subsets as in the AGM framework. Furthermore, it is shown that Levi's proposal to base the selection on a weakly monotonic measure of informational value guarantees the satisfaction of both of Gärdenfors' supplementary postulates for contraction. These results indicate that Levi has succeeded in constructing a well-behaved operation of contraction (...)
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  • Severe withdrawal (and recovery).Hans Rott & Maurice Pagnucco - 1999 - Journal of Philosophical Logic 28 (5):501-547.
    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 (...)
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  • On the status of the postulate of recovery in the logic of theory change.David Makinson - 1987 - Journal of Philosophical Logic 16 (4):383 - 394.
    Describes and discusses the rather special behaviour of one of the postulates in the AGM account of theory change.
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  • Belief contraction without recovery.Sven Ove Hansson - 1991 - Studia Logica 50 (2):251 - 260.
    The postulate of recovery is commonly regarded to be the intuitively least compelling of the six basic Gärdenfors postulates for belief contraction. We replace recovery by the seemingly much weaker postulate of core-retainment, which ensures that if x is excluded from K when p is contracted, then x plays some role for the fact that K implies p. Surprisingly enough, core-retainment together with four of the other Gärdenfors postulates implies recovery for logically closed belief sets. Reasonable contraction operators without recovery (...)
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  • Theory contraction through base contraction.André Fuhrmann - 1991 - Journal of Philosophical Logic 20 (2):175 - 203.
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  • Contraction and informational value.Isaac Levi - unknown
    According to the approach made famous by Alchourrón, Gärdenfors and Makinson (1985), revision is a transformation K*h of a potential belief state K by adding h yielding another potential belief state.1 This AGM revision transformation is a composition of two other transformations: contraction and expansion. K*h = [K-~h]+h. This is the expansion by adding h of the contraction K-~h of K by removing ~h.
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