patrickbotros Messages 34 Reaction score 1 Thread starter Mar 6, 2015 #1 (1+y2) d2y/(dt2) + t dy/dt +y = et
HallsofIvy Science Advisor Homework Helper Messages 42,895 Reaction score 983 Mar 7, 2015 #4 It is not because, as Leonita said, it has a non-linear function of the dependent variable, y.