1990 | OriginalPaper | Chapter
On Open Defaults
Author : Vladimir Lifschitz
Published in: Computational Logic
Publisher: Springer Berlin Heidelberg
Included in: Professional Book Archive
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In Reiter’s default logic, the parameters of a default are treated as metavariables for ground terms. We propose an alternative definition of an extension for a default theory, which handles parameters as genuine object variables. The new form of default logic may be preferable when the domain closure assumption is not postulated. It stands in a particularly simple relation to circumscription. Like circumscription, it can be viewed as a syntactic transformation of formulas of higher order logic.