Stretching a curly bracket to get better vertical symmetry
I didn't get your MWE run through, but with a "regular" document class such as article it does run through. One standard trick is to add a \vphantom
.
\documentclass[fleqn]{article}
\usepackage{amsmath}
\begin{document}
\begin{equation*}
\left\{
\begin{aligned}
a&=\frac{b}{c} \\
a&=\vphantom{\frac{b}{c}}e
\end{aligned}
\right.
\end{equation*}
\end{document}
Note also that mathtools
has several specialized commands/environments for similar scenarios, such as dcases
.
Here are three possibilities:
\documentclass{article}
\usepackage{bigstrut}
\usepackage{amsmath}
\begin{document}
\begin{equation*}
\left\{
\begin{aligned}
a&=\frac{b}{c} \\
a&=e\vphantom{\frac{b}{c_k}}%\\[-1ex]\mbox{}
\end{aligned}
\right.
\end{equation*}
\bigskip
\begin{equation*}
\left\{
\begin{aligned}
a&=\smash[t]{\frac{b}{c}} \\
a&=e
\end{aligned}
\right.
\end{equation*}
\bigskip
\begin{equation*}\setlength{\bigstrutjot}{2ex}
\left\{
\begin{aligned}
a&= \frac{b}{c} \\
a&=e \bigstrut[b]
\end{aligned}
\right.
\end{equation*}
\end{document}