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Searching 102. British mathematician largely credited with inventing modern algebra. George Boole, 1815-1865. Boolean Logic. Creating a SET { } that fills certain criteria. Choices of Operators: AND, OR, NOT. “AND’. Both words MUST be present to be valid for the set.

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Boolean logic l.jpg
Boolean Logic algebra.

  • Creating a SET { } that fills certain criteria.

  • Choices of Operators: AND, OR, NOT.


Slide4 l.jpg
“AND’ algebra.

  • Both words MUST be present to be valid for the set.

  • Any order, any distance apart will do.


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John Venn algebra.

1834-1923

Venn Diagram


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“OR” algebra.

  • Either word will do.

  • Useful for

    • Synonyms

    • Plurals

    • Other forms of a word (adjectives, adverbs, tenses)


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“NOT” algebra.

  • Word must NEVER appear in the record.

  • CAUTION! Think before you use this!!!


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Parentheses algebra.

  • Normal order of operation:

    • NOTs

    • ANDs

    • ORs

  • Parentheses forces that part of the operation to be done first

  • Parentheses keep various parts of your search statement together so they can be handled properly.





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Search Strategy: algebra.

bunn? OR rabbit? OR hare OR hares


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I’m looking for a pet, so I’ll add that to my search strategy:

Pet or pets

TOO MANY RESULTS! Most are not relevant


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New Strategy: strategy:

(bunn? OR rabbit? OR hare OR hares)

AND

(pet OR pets OR “companion animal?”)


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Don’t want to see laboratory animals. strategy:

Don’t want to know about hunting.

Still some weird stuff in my results!


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New Search Strategy: strategy:

  • ((bunn? OR rabbit? OR hare OR hares) AND (pet OR pets? OR “companion animal?”)) NOT (laborator? OR hunt?)


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“Stop Words” strategy:

  • Articles

    • A, An, The

  • Prepositions

    • Of, In, By, For, From, To ….


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Next Step: Fields strategy:

  • Library catalog and other databases put certain information in Fields.

    • Author:

    • Title:

    • Date:

    • Subject Headings:

  • You can use the fields to tighten up your search.



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