These Venn diagrams help to visualize the meaning of AND, OR and NOT the colored area indicates the items that will be retrieved in each case. The OR search is particularly useful when there are several common synonyms for a concept, or variant spellings of a word.Ĭombining search terms with the NOT operator narrows the search by excluding unwanted terms. The operator OR broadens the search to include records containing either keyword, or both. In CLIO, if you enter search terms without an operator, AND will automatically be inserted between them (but make sure that Javascript is enabled on your computer, or the search will fail). The operator AND narrows the search by instructing the search engine to search for all the records containing the first keyword, then for all the records containing the second keyword, and show only those records that contain both. ![]() In a Boolean search, keywords are combined by the operators AND, OR and NOT to narrow or broaden the search (you do not have to enter them in capitals). fuzzy logic Fuzzy logic in AI In artificial intelligence ( AI) systems, fuzzy logic is used to imitate human reasoning and cognition. Field Designations MUST be in Square Brackets If you are using the Boolean search screen, you must post qualify each term with a field designation that must be enclosed in square brackets. Comparing the degrees of truth with Boolean logic vs. A search formulation may contain both symbols and words to represent the Boolean operators, e.g., x & y OR z. Boolean searching is based on an algebraic system of logic formulated by George Boole, a 19th century English mathematician. It may help to see fuzzy logic as the way reasoning really works and binary, or Boolean, logic is simply a special case of it.
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