default rules

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A method for resolving conflicts and dealing with inconsistencies that arise in inheritance systems and non-monotonic reasoning. Default rules can contain components that define normality so that exceptions do not cause conflicts. For example, knowing that birds fly and Fred is a bird is inconsistent with knowing that Fred is a penguin. Attaching a “normal” predicate to the rule that birds fly and knowing that penguins are not normal birds resolves the problem.

Subjects: Computing.

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