Talks and Poster Presentations (with Proceedings-Entry):

J. Delgrande, T. Schaub, H. Tompits, S. Woltran:
"Belief Revision of Logic Programs under Answer Set Semantics";
Talk: Principles of Knowledge Representation and Reasoning (KR), Sydney, Australien; 09-16-2008 - 09-19-2008; in: "Proceedings of the 11th Conference on Principles of Knowledge Representation and Reasoning (KR'08)", G. Brewka, J. Lang (ed.); AAAI Press, (2008), ISBN: 978-1-57735-384-3; 411 - 421.

English abstract:
We address the problem of belief revision in (nonmonotonic)
logic programming under answer set semantics: given logic
programs P and Q, the goal is to determine a program R that
corresponds to the revision of P by Q, denoted P ∗ Q. Unlike
previous approaches in logic programming, our formal
techniques are analogous to those of distance-based belief revision
in propositional logic. In developing our results, we
build upon the model theory of logic programs furnished by
SE models. Since SE models provide a formal, monotonic
characterisation of logic programs, we can adapt well-known
techniques from the area of belief revision to revision in logic
programs. We investigate two specific operators: (logic program)
expansion and a revision operator based on the distance
between the SE models of logic programs. It proves to be the
case that expansion is an interesting operator in its own right,
unlike in classical AGM-style belief revision where it is relatively
uninteresting. Expansion and revision are shown to
satisfy a suite of interesting properties; in particular, our revision
operators satisfy the majority of the AGM postulates for
revision. A complexity analysis reveals that our revision operators
do not increase the complexity of the base formalism.
As a consequence, we present an encoding for computing the
revision of a logic program by another, within the same logic
programming framework.

Electronic version of the publication:

Related Projects:
Project Head Hans Tompits:
Formale Methoden zur Optimierung Nichtmonotoner Logikprogramme

Created from the Publication Database of the Vienna University of Technology.