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Most search engines support the use of the Boolean operators AND, OR and NOT to help end users refine the search query. Boolean operators are for literal searches that allow the user to refine and extend the terms of the search. The engine looks for the words or phrases exactly as entered.
The (standard) Boolean model of information retrieval (BIR) [1] is a classical information retrieval (IR) model and, at the same time, the first and most-adopted one. [2] 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 ).
The search engine supports limited boolean logic in searches. Logical NOT (negation) can be indicated by a "-" (minus sign) or a "!" (exclamation point) character prefixed to a search term, or by the NOT keyword. Parentheses (…) are ignored by the search engine and have no effect. Search terms are implicitly joined by logical AND (conjunction).
• Only the first 10 terms are used to get search results. • Term grouping and Boolean operators are supported in the following preferred order: parentheses (), quotation marks "", NOT + -, AND &, OR |. • Because OR is the operator with lowest precedence, enclose OR terms in parentheses when combined with other operators in a search.
This means that the search engine will automatically apply the AND function inbetween keywords without having to enter a symbol for the AND opperation. [6] Other search engines may require that either the symbol & [7] or + [5] be added as a prefix before the keyword. These search engines use the "OR" Boolean expression as a default search ...
Boolean search engines typically only return items which match exactly without regard to order, although the term Boolean search engine may simply refer to the use of Boolean-style syntax (the use of operators AND, OR, NOT, and XOR) in a probabilistic context.
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With search engines that support Boolean operators and parentheses, a technique traditionally used by librarians can be applied. A user who is looking for documents that cover several topics or facets may want to describe each of them by a disjunction of characteristic words, such as vehicles OR cars OR automobiles.