57 search results - page 1 / 12 » Generalizations of matched CNF formulas |
AMAI
2005
Springer
13 years 4 months ago
2005
Springer
A CNF formula is called matched if its associated bipartite graph (whose vertices are clauses and variables) has a matching that covers all clauses. Matched CNF formulas are satisf...
SAT
2007
Springer
13 years 11 months ago
2007
Springer
We demonstrate hardness results for the detection of small backdoor sets with respect to base classes Mr of CNF formulas with maximum deficiency ≤ r (M0 is the class of matched...
STACS
2010
Springer
13 years 12 months ago
2010
Springer
We call a CNF formula linear if any two clauses have at most one variable in common. We show that there exist unsatisfiable linear k-CNF formulas with at most 4k2 4k clauses, and ...
SAT
2009
Springer
13 years 11 months ago
2009
Springer
In this paper we consider the class of boolean formulas in Conjunctive Normal Form (CNF) where for each variable all but at most d occurrences are either positive or negative. This...
ISMVL
2000
IEEE
13 years 9 months ago
2000
IEEE
Signed conjunctive normal form (signed CNF) is a classical conjunctive clause form using a generalized notion of literal, called signed atom. A signed atom is an expression of the...