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# How to use search on the internet - PowerPoint PPT Presentation

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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### Searching 102

George Boole, 1815-1865

Boolean Logic algebra.

• Creating a SET { } that fills certain criteria.

• Choices of Operators: AND, OR, NOT.

“AND’ algebra.

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

• Any order, any distance apart will do.

John Venn algebra.

1834-1923

Venn Diagram

“OR” algebra.

• Either word will do.

• Useful for

• Synonyms

• Plurals

“NOT” algebra.

• Word must NEVER appear in the record.

• CAUTION! Think before you use this!!!

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.

Example:

Search Strategy: algebra.

bunn? OR rabbit? OR hare OR hares

Pet or pets

TOO MANY RESULTS! Most are not relevant

New Strategy: strategy:

(bunn? OR rabbit? OR hare OR hares)

AND

(pet OR pets OR “companion animal?”)

Don’t want to know about hunting.

Still some weird stuff in my results!

New Search Strategy: strategy:

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

“Stop Words” strategy:

• Articles

• A, An, The

• Prepositions

• Of, In, By, For, From, To ….

Next Step: Fields strategy:

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

• Author:

• Title:

• Date: