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ECAI
2008
Springer

New Results for Horn Cores and Envelopes of Horn Disjunctions

8 years 4 months ago
New Results for Horn Cores and Envelopes of Horn Disjunctions
We provide a characterization of Horn cores for formulas in conjunctive normal form (CNF) and, based on it, a novel algorithm for computing Horn cores of disjunctions of Horn CNFs that has appealing properties (e.g., it is polynomial for a bounded disjunction). Furthermore, we show that recognizing the Horn envelope of a disjunction of two Horn CNFs is intractable, and that computing a compact Horn CNF for it (that is irredundant and prime) is not feasible in polynomial total time unless P=NP; this answers an open problem.
Thomas Eiter, Kazuhisa Makino
Added 19 Oct 2010
Updated 19 Oct 2010
Type Conference
Year 2008
Where ECAI
Authors Thomas Eiter, Kazuhisa Makino
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