|4) Boolean Combinations|
Boolean operators, or search terms, are methods for combining searches. For example, you have performed 2 separate searches
1) Angina Pectoris/
If you were really interested in citations about both angina pectoris AND it's diagnosis, you could enter in line 3) of your search: 1 AND 2. This is termed a Boolean AND combination
If, on the other hand, you wanted to see all citations from both searches (which is unlikely) you would perform a Boolean OR combination: type: 1 OR 2
You may however want to view the set of citations about angina excluding
those that deal with diagnosis, a Boolean NOT combination.
Type 1 NOT 2
Or, if you are fimiliar with the specific search notations you can type in the entire sequence at once. This saves a lot of time.
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The Anatomy of a Search
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