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Connectors
Connectors (Boolean operators) are used in keyword searches to link together two or more terms. The most commonly-used connectors are: AND and OR.

AND narrows a search; you get fewer records, because both concepts must be present in the records found--here the area in blue. Use AND to combine different concepts in one search.

 

OR broadens a search; you get more records because OR includes each of the concepts separately, as well as both concepts when found together. OR is often used to link together related concepts.

computer AND history AND mathematics

 

computer OR history OR mathematics

 

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