d Abstract) Goran Gogic l, Christos H. Papadimitriou', and Martha Sideri2 : Approximating a general formula from above and below by Horn formulas (its Horn envelope and Horn c...
Goran Gogic, Christos H. Papadimitriou, Martha Sid...
The minimization problem for Horn formulas is to find a Horn formula equivalent to a given Horn formula, using a minimum number of clauses. A 2log1−ǫ (n) -inapproximability re...