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

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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{equation}
    \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{equation}\

    \end{document} 

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user3601754
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Updated on August 01, 2022

Comments

  • user3601754
    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.

    enter image description here

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

    \begin{equation}
        \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.
    
    \end{equation}\
    
    • LaRiFaRi
      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
      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
      ThomasGuenet almost 6 years
      Works perfectly to me.
    • user3601754
      user3601754 almost 6 years
      Perhaps a conflict with a package?
    • samcarter_is_at_topanswers.xyz
      samcarter_is_at_topanswers.xyz almost 5 years
      Since you have some responses below that seem to answer your question, please consider marking one of them as ‘Accepted’ by clicking on the tickmark below their vote count (see How do you accept an answer?). This shows which answer helped you most, and it assigns reputation points to the author of the answer (and to you!). It's part of this site's idea to identify good questions and answers through upvotes and acceptance of answers.