Albert Rich schrieb:   
   >   
   > It's always good to hear from a "big fan of Rubi"!   
   >   
   > Inspired in part by your post on September 7th, improvements made to   
   > the just released Rubi 4.6 enable it to integrate   
   > log(2+x)^3*log(3+x)*x^3 wrt x.  The result is comparable in size to   
   > the Mathematica's and contains 6 polylogarithm functions.   
   >   
   > More generally Rubi 4.6 can integrate, at least in principle, any   
   > expression of the form   
   >   
   >     Px F(g+h x)^m (a+b log(c (d (e+f x)^p)^q))   
   >   
   > wrt x where Px is a polynomial, m is a non-negative integer and F is   
   > log, arcsin, arccos, arctan, arccot, or their inverse hyperbolic   
   > counterparts.   
   >   
   > However, like the other systems tested, Rubi 4.6 is unable to   
   > integrate log(2+x)^3*log(3+x)^2*x^3 wrt x.  I would guess this   
   > expressions is not integrable in terms of the elementary and   
   > polylogarithm functions(?).   
   >   
      
   I would guess so too. Do you find it too difficult to reduce the number   
   of polylogarithms, or just somehow inadvisable for a rule based system?   
      
   Martin.   
      
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