Using Boolean Operators


If you enter several terms into a search box separated by blanks they will be searched as if connected by an AND conjunction.

By selecting the respective terms from a drop-down menu on the left side of the search box (Advanced Search) you can create AND, OR and AND NOT conjunctions of several boxes.

You can also simply use the operators OR, AND and NOT in the search field itself.

 

 Operator

 Description

 Example

 Results

 AND

 Shows results containing both search terms

 Title: "Baum" AND
 Author: "Heine"

 All publications whose title contains the word "Baum" and whose author is "Heine"

 OR

 Shows results containing one of both search terms

 Author: "Brecht"
 OR Year: "2005"

 All publications whose author is "Brecht" or whose year of publication was 2005

 AND  NOT

 Shows results NOT containing the search term

 Author: "Brecht"
 AND Title: "Dreigroschenoper"
 AND NOT Publisher: "Müller"

 All editions of the "Dreigroschenoper" by the author Brecht not published by "Müller-Verlag"