3

Hello I'm have created some Latex Matrix equations. But for remembering how it works i wanna create a matrix dimensions workflow like:

\begin{align}
    &\hphantom{(2\times 3)( }%
        \overbrace{\hphantom{1 \times 3) = 2 \times 1} } \nonumber \\[-07pt]%
    &( \underbrace{ 2\times 
        \underbrace{
            3) ( 1 \times 3
            }%
        ) = ( 2 } %
    \times 1) \nonumber
\end{align}

The result is enter image description here As you can see i have now used \overbrace to create the braces over my workflow. What i want is the same result but without \overbrace and (two sided) arrows instead

I hope anyone can help me

Thanks Jan-Bert

1

Use \overleftrightarrow and \underleftrightarrow.

\documentclass[a4paper]{article}
\usepackage{amsmath}
\begin{document}    
\begin{align}
    &\hphantom{(2\times 3)( }%
        \overleftrightarrow{\hphantom{1 \times 3) = (2 \times 1} } \nonumber \\[-07pt]% 
    &( \underleftrightarrow{ 2\times
        \underleftrightarrow{
            3) ( 1 \times 3
            }% 
        ) = ( 2 } %
    \times 1) \nonumber
\end{align}
\end{document}

arrows

| improve this answer | |
  • Oke i think i wasn't clear about the type of arrows i want… this kind of arrows dl.dropboxusercontent.com/u/5239536/… The image is from a lecture a few years ago so i don't know how to make that kind of arrows and can't ask it anny more... – Jan-Bert Apr 11 '15 at 8:34

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