Simple PDE

1. Jan 8, 2007

quantum123

How do you solve this simple PDE?
D/Dr (f) = D/Dt (f) ?
Pls don't just give me the final answer.

2. Jan 8, 2007

J77

Separation of variables.

3. Jan 9, 2007

quantum123

Not too sure how, can you help?

4. Jan 9, 2007

d_leet

Let f(r,t)=R(r)*T(t), substitute this into your originak equation, take the derivatives and separate the variables(Rs on one side of the equation and Ts on the other).