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# What are boolean operators 1

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### Transcript

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