Internet Search Techniques
When you use an Internet search engine, the use of
Boolean logic may be used in three different ways: Full Boolean
logic, Implied Boolean logic and Predetermined Language.
Full Boolean logic can be used with many
search engines. These "operators" use primarily the three
words: or, and, not.
I need information about cars. This search would include results
that include either terms: cars or autos
I'm interested in sports medicine. This search would include results
that include both terms: sports and medicine
I'm interested in planes but not jets. This search would include
results that would include one term but exclude the other term:
planes not jets.
Implied Boolean logic refers to a search in which Boolean
operators are not used. Symbols are used to represent Boolean logical
operators. Implied Boolean logic has become considered almost standard.
I need information about cars. If you wish to find the result
that include all terms in your search, type: cars[space]autos.
This example holds true for the search engines that interpret
the space between keywords as the Boolean and. Nowadays,
most engines use the and logic as the default for the [space]
I'm interested in sports medicine. Another way to use the Boolean
and is to use the [+] key: +sports
+medicine. You can also use quotes around the phrase, "sports
medicine" to get results using the exact phrase.
I'm interested in planes, but not jets. To exclude a term from
your search use the [-] key: planes -jets
I want to learn about plane engines but not jets. You can use
a combination of symbols: plane -jets
Predetermined Language is used as a fill-in template. Sometimes
search engines offer a search template which allows the user to
choose the Boolean operator from a menu. Often the "logical
operator" is expressed with substitute language. Examples of
substitute language might be as follows: can include, must not
include, must include.
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