What is Boolean Logic? It is the process of linking topics in order to narrow or expand a search through the use of the terms AND, OR, or NOT. AND links two terms and narrows a search. For example, if you search for "Steroids and Sports," only articles containing both terms will be retrieved (as shown by the shaded area in the illustration below). OR links two terms and expands a search. For example, if you search for "Cars or Autos," articles in which either term appears will be retrieved (as shown in the illustration below). NOT narrows a search by excluding articles containing the second search term. For example, if you search for "Virus not AIDS," all articles in which "Virus" appears will be retrieved - except for those also containing the word "AIDS" (as shown in the illustration below).
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