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| Titel: |
Computation of Extensions of Seminormal Default Theories |
| Auteur: |
Su, Kaile Li, Wei |
| Verschenen in: |
Fundamenta informaticae |
| Paginering: | Jaargang 40 (2011) nr. 1 pagina's 79-102 |
| Jaar: |
2011-02-08 |
| Inhoud: |
In Reiter's default logic, the operator in the fixed-point definition of extension is not appropriate to compute extensions by its iterated applications. This paper presents a class of alternative operators, called compatible ones, such that, at least for normal default theories and so-called well-founded, ordered default theories, we can get extensions by iterated applications of them. In addition, we completely answer Etherington's conjectures about both his procedure for generating extensions and a modified version of it. In particular, we give an example of a finite, ordered default theory, for which the original procedure fails to converge, and show that the computation of the modified one is essentially the iteration of a compatible operator and converges for finite, ordered theories. |
| Uitgever: |
IOS Press |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
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