LaTeX.org

Sorry for all my mistakes. It was the first time I was asking in this kind of forum. I will try to be more clear next time. Anyway, your code works. So thank you. Thank you also for the link of the "Math mode" guide.

I have the same problem as described here (more or less). I need to write two matrix in a row like (something)=(something else) but I would like also the number of the equation to refer to it with \vref .
I'm using this:
\begin{equation}
\left( {\begin{array}{*{20}{c}}
A&B\\
C&D
\end{array}} \right ...