# Double left brace including several lines in eqnarray with an arrow between

2,136

Probably you want this? It uses the extensible arrows from amsmath and the dcases(=display style cases) environment from mathtools (a particularly useful extension of amsmath).

    \documentclass[11pt]{article}
\usepackage{mathtools}

\begin{document}

$$\begin{dcases} \textsf{blabla 1} \\ \textsf{blabla 2} \\ \textsf{blabla 3} \end{dcases} \xRightarrow{~\textsf{blabla4}~} \begin{dcases} \textsf{blabla 5} \\ \textsf{blabla 6} \\ \textsf{blabla 7} \end{dcases}$$\

\end{document}


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### user3601754

Updated on August 01, 2022

• user3601754 6 days

I m trying to write two systems of equations with "left brace" separated with a long arrow as on the figure below.

I try with this kind of code but it doesnt work...The two systems are not aligned. One is at the bottom

$$\left\{ \begin{array}{ll} blabla1 \\ \vspace{0.01cm} \\ blabla2 \\ \vspace{0.01cm} \\ blabla 3 \\ \end{array} \right. \Longrightarrow \left\{ \begin{array}{ll} blabla5 \\ \vspace{0.01cm} \\ blabla6 \\ \vspace{0.01cm} \\ blabla7 \\ \end{array} \right.$$\

• LaRiFaRi almost 6 years
Welcome to TeX.SX! What do you mean by "it doen't work"? Errors, warnings, no output? We will have to see a compilable example of this. Appart of the very last slash and all those empty lines, your code runs fine for me.
• campa almost 6 years
Do not leave blank lines in math environments: this will produce a bunch of errors and quite likely the "One is at the bottom" bit.
• ThomasGuenet almost 6 years
Works perfectly to me.
• user3601754 almost 6 years
Perhaps a conflict with a package?