From: Albert_Rich@msn.com   
      
   On Saturday, November 23, 2019 at 6:46:55 AM UTC-10, anti...@math.uni.wroc.pl   
   wrote:   
   > IIRC percentages as lower than last time.  My impression is that   
   > new version of Rubi testsuite adds new test cases, but do not   
   > remove them, so I would expect relatively small change due to   
   > changes in testsute.   
   >    
   > Have you looked at trends and what is responsible for them?   
   >    
   > --    
   >                               Waldek Hebisch   
      
   It seems you're making the assumption only new problems are added to the   
   integration test-suite.  Rather as the quality of antiderivatives produced by   
   Rubi continues to improve, sometimes more concise and dramatically simpler   
   antiderivatives of existing    
   test-suite problems are found.  When this happens antiderivatives in the   
   test-suite formerly considered optimal are replaced with the new and improved   
   ones.     
      
   So some antiderivatives produced by the various integrators may no longer be   
   considered optimal, thus reducing the grade they receive.  In short, the   
   integration test-suite gets ever more challenging.   
      
   Albert   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)