# Control shrinking of font size in cases environment

I'm, using the cases environment of the amsmath package and I was wondering whether there is a method to control the shrinking of certain elements of it. E.g. when there is a fraction, the elements in the nominator and denominator are shrinked compared to the non-fractional case.

What I would be interested in, is e.g. whether I can enlarge the shrinked element a bit to increase its readability.

\documentclass{article}
\usepackage{amsmath}
\begin{document}
\begin{align}
x=\begin{cases}
\frac{a+b+c}{d+e+f}\\
a+b+c\\
d+e+f
\end{cases}
\end{align}
\end{document}


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You can use dcases from mathtools package. mathtools improves upon amsmath and provides some extra, cool goodies.

\documentclass{article}
\usepackage{mathtools}
\begin{document}
\begin{align}
x=\begin{dcases}
\frac{a+b+c}{d+e+f}\\
a+b+c\\
d+e+f
\end{dcases}
\end{align}
\end{document}


If you are tied to amsmath some how, use \displaystyle just after the \begin{cases} line:

\documentclass{article}
\usepackage{amsmath}
\begin{document}
\begin{align}
x=\begin{cases}
\displaystyle              %%5 <--- here
\frac{a+b+c}{d+e+f}\\
a+b+c\\
d+e+f
\end{cases}
\end{align}
\end{document}


Another option will be to use \dfrac instead of \frac as suggested by Werner, but if you have many fractions, this will give you more work ;)

\documentclass{article}
\usepackage{amsmath}
\begin{document}
\begin{align}
x=\begin{cases}
\dfrac{a+b+c}{d+e+f}\\
a+b+c\\
d+e+f
\end{cases}
\end{align}
\end{document}


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