From: Albert_Rich@msn.com   
      
   On Friday, September 11, 2015 at 9:59:55 PM UTC-10, Nasser M. Abbasi wrote:   
      
   Rubi is only designed to handle rational, not floating point, numbers.  If you   
   substitute 3/10 instead of 0.3 for a, it returns the correct antiderivative   
   without the GCD error.   
      
   Note that Rubi was never intended to be a general purpose integrator.  Rather   
   it was implemented as an aid in the creation and testing of the 6000+ rules   
   required to integrate a large class of expressions.  Implementors intending to   
   incorporate the rules    
   into a CAS will need to ensure they are called with arguments in the proper   
   form (e.g. transform 0.3 to 3/10).   
      
   Albert   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)