From: massimo.canonico@gmail.com   
      
   Hi,   
   this is a question related to fuzzy controller stability. I've already sent it   
   to many authors without receiving an answer. Also all my search on Internet   
   did not help.   
      
   Many papers that use fuzzy for feedback control try to proof the stability of   
   their controller, I am attaching one of them [1].   
      
   In particular, it is not clear to me how manage a linguistic variable equation   
   such as eq. (8) in Section 3.C :   
      
   "~u(k)" =  -["e(k)" + "delta e(k)" ]   
      
   From my point of view, this means, for example, that:   
      
    "~u(k)" = - [PS + NL]   
      
   but how can I compute - [PS + NL] ?   
      
   Thanks for your time,   
    Massimo   
      
   [1]http://www.cic.eng.wayne.edu/paper/eqos-iwqos05.pdf   
      
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