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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.
arthritis NOT letter

Example: 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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