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The Computer Journal 2001 44(5):410-424; doi:10.1093/comjnl/44.5.410
© 2001 by British Computer Society
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A Logical Model for Information Retrieval based on Propositional Logic and Belief Revision

David E. Losada1 and Alvaro Barreiro1

1 AILab, Department of Computer Science, University of A Coruña, A Coruña 15071, Spain Email: losada@dc.fi.udc.es

A logical model for information retrieval is presented. Documents and queries are represented by propositional formulas and we apply techniques of the field of belief revision to get a measure of similarity between documents and queries. The model is further extended to deal with retrieval situations. Generality and expressiveness are fundamental properties of the model. We stress the advantages of these notions in realistic scenarios. We have paid great attention to the complexity of the objective tasks and present algorithms that run in polynomial time for both the computation of the similarity between documents and queries and the inclusion of retrieval situations in the model. The model can constitute the basis of a realistic information retrieval system.

Received 9 November, 2000. Revised 23 April, 2001.


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