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            This is a file from the  Wikimedia Commons. Information from its  description page there is shown below.  Commons is a freely licensed media file repository.  You can help. 
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        Summary 
         
 This is the colour function used in the picture above
        
         
          
           | Description | 
           function Cos[z] in the complex plane | 
          
          
           | Date | 
           03.08.2007 | 
          
          
           | Source | 
           made with mathematica, own work | 
          
          
           | Author | 
           Jan Homann | 
          
          
           Permission ( Reusing this file) | 
           
             public domain 
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         Licensing 
        
         
          | Public domainPublic domainfalsefalse | 
         
        
        
         
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          This work has been released into the  public domain by its author, I,  Jan Homann. This applies worldwide. In some countries this may not be legally possible; if so: I,  Jan Homann grants anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.Public domainPublic domainfalsefalse 
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       File usage
       
        The following pages on Schools Wikipedia link to this image (list may be incomplete):
        
        
       
       This file contains additional information, probably added from the digital camera or scanner used to create or digitize it. If the file has been modified from its original state, some details may not fully reflect the modified file.
        
       
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