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{{short description|Classical information retrieval model}}
{{technical|date=June 2018}}<!-- Needs a plain-English definition without mathematical symbols -->
The (standard) '''Boolean model of information retrieval''' ('''BIR''')<ref>{{citation | author1=Lancaster, F.W. | author2=Fayen, E.G. | title=Information Retrieval On-Line | publisher=Melville Publishing Co., Los Angeles, California | year=1973}}</ref> is a classical [[information retrieval]] (IR) model and, at the same time, the first and most-adopted one.<ref>{{Cite web |title=Information Retrieval |url=https://mitpress.mit.edu/9780262528870/information-retrieval/ |access-date=2023-12-09 |website=MIT Press |language=en-US}}</ref> The BIR is based on [[Boolean logic]] and classical [[set theory]] in that both the documents to be searched and the user's query are conceived as sets of terms (a [[bag-of-words model]]). Retrieval is based on whether or not the documents contain the query terms and whether they satisfy the boolean conditions described by the query.
==Definitions==
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