1

I want to display the following

enter image description here

I'm trying to realize it with the following code

\documentclass{article}
\usepackage{amsmath}
\usepackage{mathtools}

\begin{document}
        \begin{equation}
                    \begin{cases}
             &a + b\\
             & b + c
            \end{cases} \implies
            
            \begin{cases}
            & c + d\\
            & d + e
            \end{cases} 
        \end{equation}
\end{document}

But this gives me a lot of errors and the wrong output enter image description here

Does anyone know how to fix this?

2

1 Answer 1

4

In addition to getting rid of the blank line between the two cases environments, you should also (a) get rid of the & alignment operators (since you're not really making use of much of the cases machinery) and (b) insert a \quad directive after \implies in order to even out the spacing to the left and right of the \implies (aka \Longrightarrow) symbol.

enter image description here

\documentclass{article}
\usepackage{mathtools} % mathtools loads amsmath automatically
\begin{document}

        \begin{equation}
             \begin{cases}
                a + b\\
                b + c
             \end{cases} 
             \implies \quad
             \begin{cases}
                c + d\\
                d + e
            \end{cases} 
        \end{equation}

\end{document}

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