Moderated revision

Daniel A. Grimaldi, Maria Vanina Martinez, Ricardo Oscar Rodríguez

Abstract: In this article, we provide a new kind of belief revision operator that we call Moderated Revision. At first glance, it is a non-prioritized operator that combines a basic classical AGM operator with a credibility-limited one. The underlying idea is this: when new observation μ is received, it is accepted but with doubts, i.e., uncertainty. We use a revision operator to model the accepted part and a credibility-limited one to represent uncertainty, whenever necessary. In the presence of uncertainty, a selection of the old knowledge balances the result of the revision through a disjunction, allowing the agent to accept part of the new observation and remain unsettled about the rest.