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New Tractable Cases in Default Reasoning from Conditional Knowledge Bases

Abstract:

We present new tractable cases for default reasoning from conditional knowledge bases. In detail, we introduce q-Horn conditional knowledge bases, which allow for a limited use of disjunction.We show that previous tractability results for epsilon-entailment, proper epsilon-entailment, and z- and z+-entailment in the Horn case can be extended to the q-Horn case. Moreover, we present feedback-free-Horn conditional knowledge bases, which constitute a new, meaningful class of conditional knowl...

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Publisher:
Springer
Volume:
1919
Publication date:
2000-01-01
URN:
uuid:f74903f6-9935-4554-98f4-328e00486c9c
Local pid:
cs:6737
ISBN:
3-540-41131-3

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