We attempt at a logical characterization of reasoning about normality based on the intuition that a normal situation is represented by a stable set of default assumptions. Within the context of preferential consequence relations we shall define a normality operator \$\backslash lhr\$ and study its logical properties. Finally we shall focus on the AGM-like postulates for the normality expansion, contraction and revision.
Default-assumption consequence relations in a preferential setting: Reasoning about normality / G. Casini, H. Hosni (STUDIES IN LOGIC). - In: New Essays in Logic and Philosophy of Science / [a cura di] M. D' Agostino, C. Sinigaglia. - [s.l] : College Publications, London, 2010. - pp. 52-66
Default-assumption consequence relations in a preferential setting: Reasoning about normality.
H. Hosni
2010
Abstract
We attempt at a logical characterization of reasoning about normality based on the intuition that a normal situation is represented by a stable set of default assumptions. Within the context of preferential consequence relations we shall define a normality operator \$\backslash lhr\$ and study its logical properties. Finally we shall focus on the AGM-like postulates for the normality expansion, contraction and revision.
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