From: nma@12000.org   
      
   I was trying to compare an output from integrate by Fricas with   
   Mathematica.   
      
   Fricas uses dilog() in the output, while Mathematica uses PolyLog.   
      
   It is supposed to be, according to http://mathworld.wolfram.com/   
   ilogarithm.html   
   that dilog(x) is implemented in Mathematica as PolyLog[2, x].   
      
   http://reference.wolfram.com/language/ref/PolyLog.html   
      
   And in Fricas., it says   
      
   http://fricas.github.io/api/LiouvillianFunction.html   
   "dilog(f) denotes the dilogarithm"   
      
   But I do not get the same numerical value when I try some numbers.   
   In Fricas   
      
   (31) -> dilog(4.)   
       (31)  - 1.9393754207_667089531   
      
      
   In Mathematica   
      
   In[59]:= PolyLog[2, 4] // N   
   Out[59]= 2.06131 - 4.35517 I   
      
   Any one knows what is the correct maping between Fricas dilog()   
   and Mathematica?   
      
   Thanks   
   --Nasser   
      
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