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The use of - symbol as a prefix before a keyword eliminates that word from search results. This is the NOT Boolean operation [2] which is sometimes called a negative search. [5] Searches can not be entirely negative, and must include at least one positive keyword. [4] Some search engines, such as google, utilize systems with an implied AND ...
• 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.
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 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).
Close to half of the users examined only the first one or two pages of results (10 results per page). Less than 5% of users used advanced search features (e.g., boolean operators like AND, OR, and NOT). The top four most frequently used terms were (empty search), and, of, and sex.
In computer science, a Boolean expression is an expression used in programming languages that produces a Boolean value when evaluated. A Boolean value is either true or false.A Boolean expression may be composed of a combination of the Boolean constants True/False or Yes/No, Boolean-typed variables, Boolean-valued operators, and Boolean-valued functions.
Phrase search is one of many search operators that are standard in search engine technology, along with Boolean operators (AND, OR, and NOT), truncation and wildcard operators (commonly represented by the asterisk symbol), field code operators (which look for specific words in defined fields, such as the Author field in a periodical database ...
A law of Boolean algebra is an identity such as x ∨ (y ∨ z) = (x ∨ y) ∨ z between two Boolean terms, where a Boolean term is defined as an expression built up from variables and the constants 0 and 1 using the operations ∧, ∨, and ¬. The concept can be extended to terms involving other Boolean operations such as ⊕, →, and ≡ ...