Hello Everybody, I have a question regarding intregration. I am trying to integrate the follwing equation with respect to E with limits from k to E0 ( where E0 is 5.7) and expecting to obtain an equation only in k. P1 := .97895*.38888e-1^(-.22310e-1+.38888e-1*ln(1-.17544*E))/(-.57371+ln(1-.17544*E))/k*(1.3557-1.3557*k/E+k^2/E^2) I have tried hard but couldnt do it , somebody please help me ! Thanks in advance ! I appreciate it ! Regards, Thomas !