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EPISTEMIC ENTRENCHMENT-BASED MULTIPLE CONTRACTIONS
EDUARDO FERMÉ, MAURÍCIO D. L. REIS
Journal: The Review of Symbolic Logic / Volume 6 / Issue 3 / September 2013
Published online by Cambridge University Press: 13 May 2013, pp. 460-487
Print publication: September 2013
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In this article we present a new class of multiple contraction functions—the epistemic entrenchment-based multiple contractions—which are a generalization of the epistemic entrenchment-based contractions (Gärdenfors, 1988; Gärdenfors & Makinson, 1988) to the case of contractions by (possibly nonsingleton) sets of sentences and provide an axiomatic characterization for that class of functions. Moreover, we show that the class of epistemic entrenchment-based multiple contractions coincides with the class of system of spheres-based multiple contractions introduced in Fermé & Reis (2012).

Credibility limited revision
Sven Ove Hansson, Eduardo Leopoldo Fermé, John Cantwell, Marcelo Alejandro Falappa
Journal: The Journal of Symbolic Logic / Volume 66 / Issue 4 / December 2001
Published online by Cambridge University Press: 12 March 2014, pp. 1581-1596
Print publication: December 2001
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Five types of constructions are introduced for non-prioritized belief revision, i.e., belief revision in which the input sentence is not always accepted. These constructions include generalizations of entrenchment-based and sphere-based revision. Axiomatic characterizations are provided, and close interconnections are shown to hold between the different constructions.