Name
Abstract | ||
|---|---|---|
Default logic was introduced by Reiter in 1980. In 1992, Gottlob classified the complexity of the extension existence problem for propositional default logic as $\Sigma^{\rm P}_2$-complete, and the complexity of the credulous and skeptical reasoning problem as $\Sigma^{\rm P}_2$-complete, resp. $\Pi^{\rm P}_2$-complete. Additionally, he investigated restrictions on the default rules, i. e., semi-normal default rules. Selman made in 1992 a similar approach with disjunction-free and unary default rules. In this paper we systematically restrict the set of allowed propositional connectives. We give a complete complexity classification for all sets of Boolean functions in the meaning of Post's lattice for all three common decision problems for propositional default logic. We show that the complexity is a trichotomy ($\Sigma^{\rm P}_2$-, NP-complete, trivial) for the extension existence problem, whereas for the credulous and sceptical reasoning problem we get a finer classification down to NL-complete cases. |
Year | DOI | Venue |
|---|---|---|
2012 | 10.1093/logcom/exq061 | theory and applications of satisfiability testing |
Keywords | Field | DocType |
common decision problem,default logic1,skeptical reasoning problem,propositional default logic,propositional connective,default rule,unary default rule,extension existence problem,similar approach,complete complexity classification,default logic,computational complexity,decision problem,boolean function,nonmonotonic reasoning | Default logic,Boolean function,Discrete mathematics,Decision problem,Unary operation,Lattice (order),Algorithm,restrict,Mathematics | Journal |
Volume | Issue | ISSN |
22 | 3 | 0955-792X |
Citations | PageRank | References |
17 | 0.75 | 22 |
Authors | ||
4 | ||
Name | Order | Citations | PageRank |
|---|---|---|---|
| Olaf Beyersdorff | 1 | 223 | 30.33 |
| Arne Meier | 2 | 126 | 19.00 |
| Michael Thomas | 3 | 56 | 3.33 |
| Heribert Vollmer | 4 | 805 | 71.64 |