To follow up, does that mean, that if more than two lines within the brace are present, the second argument has to be imposed? E.g.
Code: Select all
$
\begin{DotCases}[x\\x\\x]{f(x)=}
1 \dotfill \text{not}
x \dotfill \text{too}\\
1-x \dotfill \text{long}
\end{DotCases}
$