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The Review of Symbolic Logic The Review of Symbolic Logic

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EPISTEMIC ENTRENCHMENT-BASED MULTIPLE CONTRACTIONS

Published online by Cambridge University Press:  13 May 2013

EDUARDO FERMÉ  and
MAURÍCIO D. L. REIS
EDUARDO FERMÉ
Affiliation:
Centro de Ciências Exactas e da Engenharia,Universidade da Madeira and Centre for Artificial Intelligence (CENTRIA), Universidade Nova de Lisboa
MAURÍCIO D. L. REIS
Affiliation:
Centro de Ciências Exactas e da Engenharia,Universidade da Madeira and Centre for Artificial Intelligence (CENTRIA), Universidade Nova de Lisboa
Corresponding
E-mail address:
ferme@uma.pt
m_reis@uma.pt
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Abstract

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).

Type
Research Article
Information
The Review of Symbolic Logic , Volume 6 , Issue 3 , September 2013 , pp. 460 - 487
Copyright
Copyright © Association for Symbolic Logic 2013 

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