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Propositional defeasible logic has linear complexity

Published online by Cambridge University Press:  09 June 2004

MICHAEL J. MAHER
MICHAEL J. MAHER
Affiliation:
Department of Mathematical and Computer Sciences, Loyola University Chicago, Chicago, IL, USA; (e-mail: [email protected]) School of Computing & Information Technology, Griffith University
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Abstract

Defeasible logic is a rule-based nonmonotonic logic, with both strict and defeasible rules, and a priority relation on rules. We show that inference in the propositional form of the logic can be performed in linear time. This contrasts markedly with most other propositional nonmonotonic logics, in which inference is intractable.

Keywords

defeasible reasoningnon-monotonic logiccomputational complexity
Type
Research Article
Information
Theory and Practice of Logic Programming , Volume 1 , Issue 6 , November 2001 , pp. 691 - 711
Copyright
© 2001 Cambridge University Press

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