\latex

\LaTeX 

\begin{equation}
a + b = c
\end{equation}


\begin{displaymath}
 y = \left\{ \begin{array}{ll}
   a & \textrm{ ako je $d > c$ }\\
b+x & \textrm{ ujutro }\\
l & \textrm{po ceo dan}
\end{array} \right .
\end{displaymath}