Nonmonotonic reasoning, nonmonotonic logics and reasoning about change

摘要

In this paper we introduce nonmonotonic reasoning and the attempts at formalizing it using nonmonotonic logics. We examine and compare the best known of these. Despite the difference in motivation and technical construction there are strong similarities between these logics which are confirmed when they are finally shown to have a common basis. Finally we consider using nonmonotonic logics to represent reasoning about change.