Epistemic entrenchment-based multiple contractions

• Main Author: Fermé, Eduardo
• Publication Date: 2013
• Other Authors: Reis, Maurício D. L.
• Format: Article
• Language: eng
• Source: Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
• Download full: http://hdl.handle.net/10400.13/3446
• topic: Multiple contraction functions; Epistemic entrenchment-based multiple contractions; Epistemic entrenchment-based contractions; System of spheres-based multiple contractions; .; Faculdade de Ciências Exatas e da Engenharia

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 (Gardenfors, 1988; G ¨ ardenfors & 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 multi ple contractions coincides with the class of system of spheres-based multiple contractions introduced in Ferme & Reis (2012).