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    STUDIA INFORMATICA - Issue no. 2 / 2002  

  Abstract:  Mathematical organisation of data collections is based on three models: vector processing, logical and probabilistic. Vector processing model, materialised in the SMART system implementation has the best mathematical basis. In this model entities and queries have a vectorial representation and some similarities can be established between them based on the comparison of attached vectors. The similar entities will have answers for the same requests and will be searched together. On this observation the cluster hypothesis of van Rijbergen and Sparck is based. This hypothesis suggests detecting entities class as a way for increasing the efficiency of the search.  
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