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Boolean Operators (or, and, not)




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Licensed library databases and WWW search engines all use Boolean operators to combine search terms. Boolean operators are words (connectors) placed between keyword search terms to narrow or expand a search.

The common Boolean operators are:

AND, OR, NOT.

Be aware that some Web search engines use their own symbols (e.g. +, -) for these operations.

Always consult to find out what symbols are used.