From: ivlachos@egnatia.ee.auth.gr   
      
   Hi.   
      
   S-function is the most common function used to represent certain types of   
   fuzzy sets. Why is that? Why other types of polynomial functions are not as   
   common as the S-function? Exept the fact that S-function is suitable for   
   representing certain types of fuzzy sets, is its popularity also due to   
   historical reasons (since Zadeh introduced the S-function)?   
      
   Any references or hints are welcome.   
      
   Ioannis Vlachos   
      
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