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What are boolean operators 1

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What are boolean operators 1

1. 1. What are Boolean Operators? Mrs. Mersand December 2007
2. 2. <ul><li>Boolean operators are named after George Boole, an Englishman, who invented them as part of a system of logic in the mid-1800's. </li></ul><ul><ul><li>The most common Boolean operators are AND, OR, NOT and NEAR, additionally, () can be used </li></ul></ul><ul><ul><li>They are used to combine search terms when doing research </li></ul></ul><ul><ul><li>In math, they are used to connect logical statements </li></ul></ul>
3. 3. <ul><li>No… </li></ul><ul><li>they aren’t leaning </li></ul><ul><li>ghosts…. </li></ul>
4. 4. And <ul><li>Would everybody wearing Jeans, please stand up # _____ </li></ul><ul><li>Would everybody wearing Sneakers please stand up # _____ </li></ul><ul><li>Would everybody wearing jeans and sneakers please stand up # _____ </li></ul>
5. 5. Venn Diagram of AND Jeans Sneakers
6. 6. AND Explained <ul><li>Using the operator AND between keywords will limit the results of a search because all the keywords have to be present in order for an item to be retrieved. </li></ul>
7. 7. OR <ul><li>Would everybody wearing jeans please stand up #______ </li></ul><ul><li>Would everybody wearing sneakers please stand up #______ </li></ul><ul><li>Would everybody wearing jeans OR sneakers please stand up #______ </li></ul>
8. 8. Venn Diagram of OR Jeans Sneakers
9. 9. OR Explained <ul><li>Using the OR operator results in either or both of your search terms appearing in your results. </li></ul><ul><li>Using the OR operator will result in a larger number of retrieved items and therefore expands the search. </li></ul>
10. 10. NOT <ul><li>The NOT (or AND NOT) operator forbids the word after it from appearing in the items resulting from your search. </li></ul><ul><li>Would everybody wearing Jeans but NOT sneakers, please stand up </li></ul>
11. 11. Venn Diagram for NOT Jeans Sneakers
12. 12. NOT Explained <ul><li>Not helps to limit your search because it takes out a category of undesirable results. </li></ul><ul><li>NOT or AND NOT thus narrows or limits a search by excluding the keyword immediately following it. </li></ul>
13. 13. NEAR <ul><li>Finds the terms within 10 words of each other </li></ul><ul><li>Domestic NEAR Violence </li></ul><ul><ul><li>would make sure these two words appeared close enough to each other that they would be referring to domestic violence </li></ul></ul>
14. 14. ( ) <ul><li>Used to group together words or phrases, for example </li></ul><ul><li>(domestic NEAR violence) and (police AND trial) </li></ul><ul><ul><li>Brings could be used to search for domestic violence that has been interrupted by the police or gone to trial </li></ul></ul>
15. 15. Order of operators <ul><li>Just as in math, certain operators are done first. The order for Boolean operators is: </li></ul><ul><ul><li>( ) </li></ul></ul><ul><ul><li>NEAR </li></ul></ul><ul><ul><li>NOT </li></ul></ul><ul><ul><li>AND </li></ul></ul><ul><ul><li>OR </li></ul></ul>
16. 16. Be sure to use proper search structure <ul><li>What would the following search bring up? </li></ul><ul><li>Dogs AND ((rabies OR rabid) NOT (domestic OR Pet) ) </li></ul><ul><ul><li>The search will look for the words rabies and rabid </li></ul></ul><ul><ul><li>Then domestic and pet </li></ul></ul><ul><ul><li>Then remove all results that contain the words domestic or pet from the results </li></ul></ul><ul><ul><li>Then remove anything that does not contain the word dog from the results </li></ul></ul>
17. 17. Now lets try some on our own <ul><li>You should always use more than one search engine when you are doing research </li></ul><ul><li>Try thinking out of the box, give Google a break!! </li></ul><ul><li>Other options </li></ul><ul><ul><li>infomine.ucr.edu </li></ul></ul><ul><ul><li>www.lii.org </li></ul></ul><ul><ul><li>www.ipl.org </li></ul></ul><ul><ul><li>www.nettrekker.com </li></ul></ul><ul><ul><li>www.altavista.com </li></ul></ul><ul><ul><li>www.mama.com </li></ul></ul><ul><ul><li>www.dogpile.com </li></ul></ul><ul><ul><li>www.yahoo.com </li></ul></ul><ul><ul><li>www.surfwax.com </li></ul></ul><ul><ul><li>www.ixquick.com </li></ul></ul>