Axel Vogt schrieb:   
   >   
   > On 16.04.2017 19:59, clicliclic@freenet.de wrote:   
   > ...   
   >   
   > Maple allows "only" top level commands (but one is   
   > free to dig in its libraries).   
      
   OK. This settles the issue :(.   
      
   >   
   > BTW: ln(x)*ln(x^2) = 2*ln(x)^2 holds for 0 < x,   
   > for x = -1 you would have 0 = -2*Pi^2 in Maple   
      
   Or, equivalently, you would have found that pi = 0 :).   
      
   This kind of dangerous inconsistency is only found in systems whose   
   design reaches back to the 1960's to 80's. It would simply constitute a   
   bug in Maple, Mathematica, Derive, and Sympy. The same may apply to   
   Reduce, MuPAD and Giac/Xcas, but I don't know enough about them to say.   
      
   Martin.   
      
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