Thank you,   
   Ok i should use rule('j*'j==1)   
   but it is possible to use   
   rule(('j)^n==('j)^(n-2))   
   with n in INT n>=2 instead   
   How to specify n is a [generic variable number] INT and has to be >=2, in a   
   rule?   
      
   I say that because that formula it seems the right one for simplify   
   every expression contained"j"   
   even j*j*j*j. j^3 ecc   
   but   
    if n<0 there is a problem, i think code enter in a loop...   
      
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