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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 
        
         
          
           | Description | 
           Paraboloid surface with a marked maximum point. | 
          
          
           | Date | 
           19 January 2007 | 
          
          
           | Source | 
           Created with the help of  GraphCalc | 
          
          
           | Author | 
            Freiddy | 
          
          
           Permission ( Reusing this file) | 
           
             Public Domain 
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         Licensing 
        
         
          | Public domainPublic domainfalsefalse | 
         
        
        
         
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          I, the copyright holder of this work, release this work into the  public domain. This applies worldwide. In some countries this may not be legally possible; if so: I grant 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):
        
        
       
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