Belief Revision - download pdf or read online

By Peter Gärdenfors

ISBN-10: 0511526660

ISBN-13: 9780511526664

ISBN-10: 0521412609

ISBN-13: 9780521412605

ISBN-10: 0521545641

ISBN-13: 9780521545648

Trust revision is a subject of a lot curiosity in theoretical desktop technology and common sense, and it varieties a crucial challenge in learn into man made intelligence. merely: how do you replace a database of data within the mild of recent info? What if the hot details is in clash with whatever that was once formerly held to be actual? An clever procedure may be capable of accommodate all such circumstances. This publication features a selection of examine articles on trust revision which are thoroughly brand new and an introductory bankruptcy that offers a survey of present learn within the sector and the basics of the idea. therefore this quantity can be important as a textbook on trust revision.

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Entails a A /3, but neither is one a subset of the other. Prevented from identifying unique natural contraction and revision operations, Alchourron, Gardenfors, and Makinson formulate and motivate sets of rationality postulates that these operations should satisfy. We do not need to review these postulates here, other than to mention that the postulates for contraction and revision are logically equivalent if the revision K + OL of a theory K is defined by means of the Levi identity K + ad=(K -=- - a ) + a, so that revision by a is equivalent to contracting by ->a to remove any inconsistent beliefs and then expanding with a.

Some results in Gardenfors (1978) seem to justify the claim that the Ramsey test can be used as a basis for an epistemic semantics of conditionals. However, the list of conditions that were used to generate the logic of conditionals does not include (K+4) (or the full strength of (K+8)). An interesting question is whether it is possible to use (RT) together with (K+4) when analysing the logic of conditionals. With minor qualifications, the answer turns out to be no. In order to put the result as strongly as possible, one can start from the following preservation condition: (K+P) If - ^ e K and \|/ e K, then \|/ e K+(|) It is easy to show that the preservation criterion is essentially equivalent to (K+4).

But, as the preceding description of RMS makes clear, reason maintenance involves conservative updates in this sense, as its incremental revision approach minimizes the set of changed beliefs. This same behavior can apply to any foundations approach, so that this sense of conservatism does not distinguish coherence and foundations approaches at all. 7 ASSESSING THE ECONOMIC CRITIQUE Gardenfors (1990) makes the claim that reason maintenance entails excessive costs, but provides no support for this claim.

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Belief Revision by Peter Gärdenfors

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