From: jonas.matuzas@gmail.com   
      
   On Friday, February 28, 2014 5:25:57 PM UTC+2, Jean-Michel Collard wrote:   
   > Le 28/02/2014 15:32, Jonas Matuzas a écrit :   
   >    
   > > I wrote integral in Mathematica:   
   >    
   > > Integrate[Cos[x]^4/(1 + x^8), {x, -\[Infinity], \[Infinity]}]   
   >    
   > >   
   >    
   > >   for fun,( for speed compassion between win7 and Linux (actual I found   
   that in Linux 4x faster with more simple integrals ))   
   >    
   > >   and... This integral is still calculating, it is already passed 1.5 day   
   , I am getting curios ... I am gonna to leave it for weekend in work place .   
   My computer is almost front end- (i7 4770, 16 GB RAM), integral is running on   
   Linux.   
   >    
   > >   I am a bit lazy but I think this integral can by taken with pencil and   
   paper using residual theory.   
   >    
   > >   I find publication  is talking about similar problem , and writing that   
   in this case residual theory is not complete..:   
   >    
   > >   http://www.csm.ornl.gov/~bowman/fjts312.pdf   
   >    
   > >   
   >    
   > >   What do you think - is it connected with so long calculation time.   
   >    
   > > Do you have some thoughts about this case?   
   >    
   > >   I am just curios :)   
   >    
   > >   
   >    
   >    
   >    
   > Try NIntegrate and you will have the answer in less than a second.   
      
     I know that NIntegrate it will do in less then seconds. But this group is   
   ...symbolic. Actually I do not need answer. This is my game. I will not help   
   humanity to live better solving this integral. For me it is just curios - what   
   mathematic is doing so    
   long with a such simple integral ?! And what the answer would be after so long   
   (days)calculation.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)