1. The latex command \{ in a math formula is rendered in red instead of
blue.
2. Typing { in mathed generates both \{ and \}, and it is not possible to
generate only \{.
Why is it needed to have a single \{ ?
Here is an example:
\begin{align*}
S & = \{ x : some long condition \\
& \qquad long condition continued \}
\end{align*}
3. When typing \{ in mathed, both { and } are generated, and it is not
possible to generate only {.
Why is it needed to have a single { ?
\begin{align*}
a & = b \\
\foo{b & = c \\
} c & = d
\end{align*}
Where \foo is used to control whether the middle line will appear or not
(by using either \newcommand{\foo}[1]{#1} or \newcommand{\foo}[1]{} ).
