Boolean logic

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Boolean logic

 [boo´le-an]
an algebra that permits operations on sets of elements; it is used in online literature searches. The principal Boolean operators are AND (intersection), OR (union), and NOT (difference).
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If one does a search using the Boolean search strategy "multicultural AND spirituality," the earliest relevant article found was published in 1992 (Pate & Bondi).
The specially designed keyword engine was equipped to handle and, or and not Boolean operators; allowed the user to set the proximity for Boolean searches to word, sentence, paragraph, heading, and article levels; and included wild-card capabilities.
Current Contents eSearch then transforms the Boolean search into a probabilistic one by adding weighting and relevance criteria.
A drawback to all of the free sources was the inability to conduct complex Boolean searches and remove duplicates.
Within each of these fields, the user can enter a complex Boolean search, as well as an asterisk (*) for truncation.
The chapter on search engines is a condensed and updated version of Hock's previous book, with quick overviews of how search engines work and how to construct a Boolean search. He profiles AlltheWeb, AltaVista, Google, HotBot, and Teoma in some detail, with a handy chart comparing their features.
A simple Boolean search on GaLtieri and FaLkLand IsLands retrieves 21 entries tracing the Argentine leader's political background, involvement, sentencing, and eventual pardon.
Access features include Boolean search, name and subject indexes, and a powerful attribute search capability.
Many familiar fee-based databases provide value-added features, such as indexed fields, subject descriptors, and Boolean search syntax that help pinpoint an industry overview article.
If searchers use a Boolean search screen, they will get Web links as part of their answer sets.
Users only need to type in their search terms to do a Boolean search.
It remains a Boolean search screen and each of the three options--Single Find Field, Single Find Field with Search Builder, and Guided-Style Find Fields--offers search history, an SDI and alert capability, and the new spell-check feature.