Expansion and contraction of finite states

Studia Logica 76 (3):427-442 (2004)
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Abstract

We present a theory that copes with the dynamics of inconsistent information. A method is set forth to represent possibly inconsistent information by a finite state. Next, finite operations for expansion and contraction of finite states are given. No extra-logical element — a choice function or an ordering over (sets of) sentences — is presupposed in the definition of contraction. Moreover, expansion and contraction are each other's duals. AGM-style characterizations of these operations follow.

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Allard Tamminga
University of Greifswald

References found in this work

Theory contraction through base contraction.André Fuhrmann - 1991 - Journal of Philosophical Logic 20 (2):175 - 203.
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.
Reversing the Levi identity.Sven Ove Hansson - 1993 - Journal of Philosophical Logic 22 (6):637 - 669.

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