How to give it up: A survey of some formal aspects of the logic of theory change

Synthese 62 (3):347 - 363 (1985)
The paper surveys some recent work on formal aspects of the logic of theory change. It begins with a general discussion of the intuitive processes of contraction and revision of a theory, and of differing strategies for their formal study. Specific work is then described, notably Gärdenfors'' postulates for contraction and revision, maxichoice contraction and revision functions and the condition of orderliness, partial meet contraction and revision functions and the condition of relationality, and finally the operations of safe contraction and revision. Verifications and proofs are omitted, with references given to the literature, but definitions and principal results are presented with rigour, along with discussion of their significance.
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Giovanni Sartor (1992). Normative Conflicts in Legal Reasoning. Artificial Intelligence and Law 1 (2-3):209-235.

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