# Mathtools and Mtpro2 curly brace

In the mathtools package there is the dcases environment by which mathematical expressions are presented in displaystyle mode in each row of the case environment, as shown in the first picture.

With mtpro2 package, the \ccases command offers the curly brace in the same cases environment as shown below

but every row has to be put inside \displaystyle command in order to produce the same result. I would like to use the mtpro2 curly brace along with the displaystyle equations in every row without having to put every row in display mode.

Is there a way to

1. replace globally the dcases brace with the curly one from mtpro2 package? Or
2. renew the \ccases environment so every row is in displaystyle?

Both approaches are accepted.

\documentclass{article}
\usepackage[lite]{mtpro2}
\usepackage{amsmath}
\usepackage{mathtools}

\begin{document}
$\begin{dcases} \int_{0}^{1}{x^2\ d x} & \text{1st argument}\\ \sum_{n=1}^{\infty}{\frac{1}{n^2}} & \text{2nd argument} \end{dcases}$

$\ccases{ \displaystyle{\int_{0}^{1}{x^2\ d x}} & \text{1st argument}\\ \displaystyle{\sum_{n=1}^{\infty}{\frac{1}{n^2}}} & \text{2nd argument}}$
\end{document}

• Just a remark; the vertical spacing between the rows of ccases is not very good. – Bernard Nov 14 '19 at 23:12

Also if ccases of mtpro2 v. lite not has very good vertical spacing between the rows you can add at the end the \\ your measure to increase the vertical spacing putting [2ex] (for example). This way you'll have more vertical space and the two codes look the same. After I have added for a very good view newtxtext package to have a more homogeneous stylistic coding.

\documentclass{article}
\usepackage[lite]{mtpro2}
\usepackage{newtxtext}
\usepackage{amsmath}
\usepackage{mathtools}

\begin{document}
$\begin{dcases} \int_{0}^{1}{x^2\ d x} & \text{1st argument}\\ \sum_{n=1}^{\infty}{\frac{1}{n^2}} & \text{2nd argument} \end{dcases}$

$\ccases{ \displaystyle{\int_{0}^{1}{x^2\ d x}} & \text{1st argument}\\[2ex] \displaystyle{\sum_{n=1}^{\infty}{\frac{1}{n^2}}} & \text{2nd argument}}$
\end{document}