# Thread: Classify linear or nonlinear

1. ## Classify linear or nonlinear

Hi,

I have some trouble finding out whether the equation

$\displaystyle t^2 R''' - 4tR'' + R' + 3R = e^t$

is linear or non-linear. My guess is that it is linear, but I cannot explain why.

Honey$\displaystyle \pi$

2. Originally Posted by HoneyPi
Hi,

I have some trouble finding out whether the equation

$\displaystyle t^2 R''' - 4tR'' + R' + 3R = e^t$

is linear or non-linear. My guess is that it is linear, but I cannot explain why.

Honey$\displaystyle \pi$