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Introduction to Boolean Logic (continued)

NOT:

  • Retrieves a set from which citations to articles containing specified search terms following the NOT operator are eliminated.

Example: arthritis NOT letter arthritis NOT letter

Note in the diagram to the right and in the sample search results below that the retrieval is a portion of the total retrieval for arthritis – that portion not including the term letter.

Search terms

Results

arthritis

167,933

letter

617,646

arthritis NOT letter

159,681

  • Use the NOT operator with caution; you might eliminate relevant articles.
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