A logical expression with two possible values: true and false. The Oracle Information Navigator search feature includes options that, if selected, automatically use OR, AND, or NOT logic when searching for words.
Named after the nineteenth-century mathematician George Boole, Boolean logic is a form of algebra in which all values are reduced to either TRUE or FALSE. Boolean logic is especially important for computer science because of its suitably for use with the binary numbering system, in which each bit has a value of either 1 or 0. Another way of looking at it is that each bit has a value of either TRUE or FALSE.
Boolean logic is a form of algebra in which all values are reduced to either true or false. Boolean logic is especially important for computer science because it fits nicely with the binary numbering system, in which each bit has a value of either 1 or 0. Another way of looking at it is that each bit has a value of either true or false. Some search engines use Boolean logic.
logical operators--AND, OR, NOT--showing relationships between sets. Used to construct search statement s when searching computer databases. For example: set 1 AND set 2 - athletes AND drugs set 1 OR set 2 - drugs OR narcotics set 1 NOT set 2 - drug use NOT drug abuse
A field of mathematical analysis in which comparisons are made. A pro- grammed instruction can cause a comparison of two fields of data, and modify one of those fields or another field as a result of comparison. This system was formulated by British mathematician George Boole (1815-1864). Some boolean operators are OR, AND, NOT, XOR, EQV, and IMP.
A form of search strategy used in databases such as LEXIS and WESTLAW. In a Boolean search, connectors such as AND, OR and NOT are used to construct a complex search. The LEXIS command "pogo-stick and minefield" for example, retrieves documents in which the words "pogo-stick" and the word "minefield" both appear.
Connecting terms that enable the user to do a more specific search in a DATABASE. Boolean terms are: and, or, not. "And" narrows, "or" broadens, and "not" eliminates items from a search. In SAGE, when doing a WORDS SEARCH, "and" is implicit--that is to say, the computer will connect the terms together with "and" unless the user types in "or" or "not." However, when searching most CD-ROMs there is no implicit "and" and the user must type "and" when desiring a search outcome that includes all words. For example, "women and health and aging."
Named after the nineteenth-century mathematician George Boole, Boolean logic is the process of linking topics in order to narrow or expand a search through the use of the terms AND, OR, or NOT (Bell, 2001). Boolean logic is use to search computerised information systems (such as the library catalogue or periodical databases) using the Boolean connectors (AND, OR, NOT).
A process of reasoning using symbolic relationships designed to permit mathematical calculations. It incorporate sets, propositions, and on-off circuit elements such as AND, OR and NOT. It is also called Boolean mathematics and Boolean algebra.
A method for combining search terms using operators to limit or expand the numbers of results. Originally developed by the mathematician George Boole in the mid-19th Century. See also Boolean Operators, Venn Diagrams and Operators.
A manner in which computers can process data, named after the 19th-century English mathematician, George Boole. Boolean operators are: AND: which narrows a keyword search by collecting all terms present in the same document (ex. documents with both apples and oranges), NOT: which prevents retrieval of unwanted documents containing a keyword (ex. documents on just apples, not oranges), OR: which broadens a keyword search by linking related terms (ex. documents on either apples or oranges).
Used in searching electronic resources. Using AND between two terms finds records containing both terms. Using OR between two terms finds records containing either term. NOT finds records containing the first term, but not the second.
It is the process of linking topics in order to narrow or expand a search through the use of the terms AND, OR, or NOT. AND links two terms and narrows a search. For example, if you search for "coffee and caffeine", only articles containing both terms will be retrieved. OR links two terms and expands a search. For example, if you search for "cars or automobiles", articles in which either term appears will be retrieved. NOT narrows a search by excluding articles containing the second search term. For example, if you search for "beer not ginger," all articles in which "beer" appears will be retrieved except for those also containing the word "ginger".
Allows you to carefully design a search query by using AND, OR and NOT to link words together. For example: origami AND cranes will find documents that include both of these words. origami OR paper folding will find documents that include either of these words. Macintosh NOT computer will find documents that include the word Macintosh but not the word Computer.
The use of boolean operators, governed by algebraic rules, to delineate and refine a computer search. Boolean logic holds that search operations will occur in a set pattern; for example, statements inside parentheses will be dealt with first, followed by not statements, then by and statements, and then by or statements. Thus, according to boolean logic, the search: water and pollution or air and pollution is equivalent to the search (water and pollution) or (air and pollution) and is also equivalent to the search (water or air) and pollution .
Use of operators AND, OR, NOT to combine search terms. (see KEYWORDS/KEYWORD SEARCHING). AND means that both words you type must be included in search, such as "RED and RIDING". OR means that either one word, or the other word, or both words can be included. "RIDING or HOOD". Not means to exclude a word from your search, "RED not WOLF".
A symbolic language that is used to describe to a Search Engine what you are, and are not, searching for. Using Boolean Logic typically means that you connect your chosen Keywords using the words and, or, and not.
allows you to combine terms with "and" or "or" in computerized databases. For example, searching "personnel management and Japan" retrieves citations which contain both terms. Searching "automobiles or cars" retrieves citations which contain at least one of the terms.
named for mathematician George Boole. This is simply the practice of combining different sets of information using basic logical operators like "and", "or", and "not" to broaden or narrow a search. It is an invaluable skill to have when searching a large database like MEDLINE, as well as when searching the Internet.
A system of logical thought developed by English mathematician George Boole (1815-64). A Boolean search combines key concepts or search terms with the logic operators AND, OR, and NOT to specify the exact information desired.
The term Boolean refers to the logic computers use to determine if a statement is true or false. Boolean logic is the form of logic where every answer is either true or false. Many search engines will allow you to use Boolean expressions to specify your search.
(also see digital) - a form of algebra in which all values are reduced to either TRUE or FALSE; this is the basic theory behind digital systems, where functions--known as logic gates--change incoming "1's" and "0's" according to a set of rules. Logic gates are put together in a sequence to get complex results, but they actually only do a limited number of things: they invert a bit (a HIGH input becomes a LOW output, called a NOT operation), and they compare two bits and tell you if they are the same (an AND gate) or different (an OR gate). These can all be mixed to get AND and OR gates that also invert to give NAND and NOR gates. Gates can be built up into complex structures that add, multiply, and compare numbers.
a type of logic (using AND, OR, NOT operators, for example) used by search engines to find information on the Internet and in electronic databases. (For example, to find computer viruses instead of human viruses, you might try the keywords "computers and viruses.")
Way to combine terms using "operators" such as "AND," "OR," "AND NOT" and sometimes "NEAR." AND requires all terms appear in a record. OR retrieves records with either term. AND NOT excludes terms. Parentheses may be used to sequence operations and group words. Always enclose terms joined by OR with parentheses.
A form of algebra in which all values are either true or false and the operators are NOT, AND, OR, NAND (not AND), NOR (not OR), XOR (exclusive OR) and XNOR (exclusive not OR). NOT inverts values from true to false and vice versa. For variables A and B, AND results in true if both are true, OR results in true if either or both are true, NAND results in true if either or both are false, NOR results in true if both are false, XOR results in true if either but not both are true, and XNOR results in true if both are either true or false. Boolean Logic is particularly useful for computing because the true/false values correspond to the 1's and 0's of the binary system on which virtually all digital computers are based.
Boolean logic is a complete system for logical operations. It was named after George Boole, an English mathematician at University College Cork who first defined an algebraic system of logic in the mid 19th century. Boolean logic has many applications in electronics, computer hardware and software.