The Kronecker delta is defined as [link to wikipedia](http://en.wikipedia.org/wiki/Kronecker_delta): 
$$\delta\_{l,m} = \begin{cases}
1 & \text{if }m=l,\\
0 & \text{if }m\neq l.
\end{cases}$$

I would like to denote the case where:
$$ = \begin{cases}
0 & \text{if }m=l,\\
1 & \text{if }m\neq l.
\end{cases}$$

How should this be done?