From: Hannes.Gassert@unifr.ch   
      
   I'm looking for detailed information on the Einstein Sum/Product   
   operators, like what was their original purpose, in what kind of   
   application have they been successful, their history, et cetera.   
   I'd be glad if you could give me some hints where to look further for   
   such information.   
      
   Thanks a lot &   
   kind regards,   
      
   Hannes Gassert   
      
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