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Acknowledgment: I wish to thank the three anonymous referees and the Information Retrieval group at the University of Glasgow for their insightful comments. In particular, I wish to thank Juliet van Rijsbergen for her kind support in explaining me the mystery of the English language. Abstract -The use of logic to model the information retrieval process has become an established research area. Nevertheless, many people in the information retrieval community do not yet appreciate the workdoi:10.1016/s0306-4573(97)00041-1 fatcat:zbh7mky3orhgzcygeia465rpoy