Logic Journal of IGPL Advance Access originally published online on June 7, 2009
Logic Journal of IGPL 2009 17(4):325-350; doi:10.1093/jigpal/jzp014
Distance-based non-deterministic semantics for reasoning with uncertainty
Department of Computer Science, The Academic College of Tel-Aviv, Israel.
E-mail: oarieli{at}mta.ac.il
Department of Computer Science, Tel-Aviv University, Israel.
E-mail: annaz{at}post.tau.ac.il
Non-deterministic matrices, a natural generalization of many-valued matrices, are semantic structures in which the value assigned to a complex formula may be chosen non-deterministically from a given set of options. We show that by combining non-deterministic matrices and distance-based considerations, one obtains a family of logics that are useful for reasoning with uncertainty. These logics are a conservative extension of those that are obtained by standard (i.e., deterministic) distance-based semantics, and so usual distance-based methods (in the context of, e.g., belief revision, information integration, and social choice theory) are easily simulated within our framework.
We investigate the basic properties of the distance-preferential non-deterministic logics, consider their application for reasoning with incomplete and inconsistent information, and show the correspondence between some particular entailments in our framework and well-known problems like max-SAT.
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