[Tex/LaTex] Arrow with multiline expression above and below

math-mode

I was trying to write this in latex
enter image description here

but I don't know how to to insert the arrow in the middle with the expressions below and above on it.

Best Answer

Use \substack together with \xrightarrow:

\documentclass{article}
\usepackage{amsmath}

\begin{document}

\[
\begin{pmatrix}
1 & 2 & 3 \\
4 & 5 & 6 \\
7 & 8 & 9
\end{pmatrix}
\xrightarrow
 [% below
  \substack{a+cx+x^2\\s+x}
 ]
 {% above
  \substack{a+cx+x^2\\s+x}
 }
\begin{pmatrix}
1 & 2 & 3 \\
4 & 5 & 6 \\
7 & 8 & 9
\end{pmatrix}
\]

\end{document}

enter image description here

Related Solutions

[Tex/LaTex] Arrow with an asterisk superscript and text above

If your problem is that the argument to the extendible arrow (e.g. add) is raising the asterisk too high, you can always \smash your argument so that it takes no vertical space (e.g. using code such as $\xrightarrow{\smash{add}}^*$ ).

Edit. As implied by egreg in the comments, a better solution would be to use \xrightarrow{\text{add}}\mathrel{\vphantom{\to}^*}, so that the text above the arrow contributes to the height of the line without contributing to the height of the superscript. (See this duplicate question for reference.)

[Tex/LaTex] How to label \rightleftarrows above and below

I don't know which package defines \rightleftarrows but this shows how to get labels over and under one of the standard arrows.

Edit updated to use the requested arrow

\documentclass{article}

\usepackage{amssymb}

\begin{document}

\[a \mathrel{\mathop{\rightleftarrows}^{\mathrm{over}}_{\mathrm{under}}} b\]

\end{document}

enter image description here

Best Answer

Related Solutions

[Tex/LaTex] Arrow with an asterisk superscript and text above

[Tex/LaTex] How to label \rightleftarrows above and below

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