If I write:
\begin{equation}
x+1
\end{equation}
and select these 3 lines and select TeX Style, I get the error:
Display math should end with $$
It works only if I write it in one line:
\begin{equation}x+1\end{equation}
Is there a way to write it on multiple lines?
The fact is that I want to use the command:
\begin{equation*}
|x|=
\begin{cases} x & \text{if $x>0$,}
-x &\text{if $x\le 0$.}
\end{cases}
\end{equation*}
What I have to do to make it work in lyx?
I have tried the multline example in the math tips, but I can't
figure out how to make it work, too. (I have already added the line
\usepackage{amsmath, amsthm, amssymb} in the latex preamble)
--
A presto,
Davide Cavallari
Bilbo's First Law:
You cannot count friends that are all packed up in barrels.
