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Vladimir Lifschitz
, David Pearce and Agustin Valverde
A logic program PI_1 is said to be equivalent to a logic program PI_2 in the sense of the answer set semantics if PI_1 and PI_2 have the same answer sets. We are interested in the following stronger condition: for every logic program PI, PI_1 union PI has the same answer sets as PI_2 union PI. The study of strong equivalence is important, because we learn from it how one can simplify a part of a logic program without looking at the rest of it. The main theorem shows that the verification of strong equivalence can be accomplished by checking the equivalence of formulas in a monotonic logic, called the logic of here-and-there, which is intermediate between classical logic and intuitionistic logic.
View:
PS
Citation:
ACM Transactions on Computational Logic
, Vol. 2 (2001), pp. 526-541.
Bibtex:
@article{lif01, title={Strongly Equivalent Logic Programs}, author={Vladimir Lifschitz and David Pearce and Agustin Valverde}, volume={2}, journal={ACM Transactions on Computational Logic}, pages={526-541}, url="http://www.cs.utexas.edu/users/ai-lab/?lif01", year={2001} }
People
Vladimir Lifschitz
Faculty
vl [at] cs utexas edu
Areas of Interest
Answer Set Programming
Nonmonotonic Reasoning
Labs
Texas Action Group