This is a Plus Edition article, written by and copyright by Dick Eastman.
NOTE: This is the second installment of a multi-part article. Part #1 is available at http://eogn.com/wp/?p=6206.
All modern search engines use at least some forms of Boolean logic. Named after the mid-19th century mathematician, George Boole, who first defined an algebraic system of logic, Boolean logic allows for the combining of search terms using “elements” or “operators.”
Boolean logic allows the user to specify such terms as AND and OR and NOT when searching for information. For instance, I might want to search for an ancestor named Ezekiel Towler. A search looking for all pages that contain both the word “Ezekiel” and the word “Towler” can be specified as:
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