I've been given this equation:

$\displaystyle \frac{\partial n}{\partial t} = D_0 \frac{\partial}{\partial x}\left [ \left ( \frac{n}{n_0} \right ) ^m \frac{\partial n}{\partial x} \right ]- \mu n, D_0>0, \mu >0$

(where "$\displaystyle - \mu n$" is the death term)

Then I'm told:

Suppose $\displaystyle n(x,0) = Q\delta (x)$ . Show by appropriate transformations in $\displaystyle n$ and $\displaystyle t$ that this question can be reduced to one equivalent to

$\displaystyle \frac{\partial n}{\partial t} = D_0 \frac{\partial}{\partial x}\left [ \left ( \frac{n}{n_0} \right ) ^m \frac{\partial n}{\partial x} \right ]$

ie with no death term.

Now, I have absolutely no idea what transformations to use...