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Belief revision is an operation that aims at modifying old beliefs so thatthey become consistent with new ones. The issue of belief revision has beenstudied in various formalisms, in particular, in qualitative algebras (QAs) inwhich the result is a disjunction of belief bases that is not necessarilyrepresentable in a QA. This motivates the study of belief revision informalisms extending QAs, namely, their propositional closures: in such aclosure, the result of belief revision belongs to the formalism. Moreover, thismakes it possible to define a contraction operator thanks to the Harperidentity. Belief revision in the propositional closure of QAs is studied, analgorithm for a family of revision operators is designed, and an open-sourceimplementation is made freely available on the web. (This is the extendedversion of an article originally presented at the 14th International Conferenceon Principles of Knowledge Representation and Reasoning.)

Belief revision in the propositional closure of a qualitative algebra (extended version)