Originally Posted by

**Jones** Hehe, how would i get a left bracket first to indicate an equation system, (or congruence system if you like)

Try this :

$\displaystyle \begin{cases}

\phi(n) \equiv q \pmod{42} \\

p \equiv n \pmod{234^{432}} \\

\end{cases}$

If you want to have the symbols $\displaystyle \equiv$ aligned you can use the command & :

$\displaystyle \begin{cases}

\phi(n) & \equiv q \pmod{42} \\

p & \equiv n \pmod{234^{432}} \\

\end{cases}$

If you don't want $\displaystyle q$ and $\displaystyle \phi(n) $ to be aligned on the left, you'll have to use an *array* instead of the *cases* environment :

$\displaystyle

\left\{

\begin{array}{ccl}

\phi(n) & \equiv & q \pmod{42} \\

p & \equiv & n \pmod{234^{432}} \\

\end{array}

\right.

$

$\displaystyle

\left\{

\begin{array}{rcl}

\phi(n) & \equiv & q \pmod{42} \\

p & \equiv & n \pmod{234^{432}} \\

\end{array}

\right.

$