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The negation operator, in various forms in which it appears in Information Retrieval queries, is investigated. The applications include negated terms in Boolean queries, more specifically in the presence of metrical constraints, but also negated characters used in the definition of extended keywords by means of regular expressions. Exact definitions are suggested and their usefulness is shown on several examples. Finally, some implementation issues are discussed, in particular as to the order in which the terms of long queries, with or without negated keywords, should be processed, and efficient heuristics for choosing a good order are suggested. 相似文献
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情报检索系统:从布尔逻辑到向量空间张进ABSTRACTByanalysingbasicstructures,applicability,functionsandpotentialsofBooleanlogicbasedinformationretri... 相似文献
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提出布尔滤子的概念,研究它的一些基本性质,得到由布尔滤子所诱导的商代数是布尔代数的结论,同时给出了判定布尔滤子的等价条件,得到格蕴涵代数中布尔滤子与关联滤子一致的结论。 相似文献
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