# Arrow to side of commutative diagram

I have the following code in a beamer doc:

\begin{equation*}
\begin{tikzcd}[ampersand replacement=\&, column sep=small, row sep=small]
\&  \arrow[dl,dash] d \arrow [dr,dash]  \&  \&  \text{\footnotesize finer} \\
\tau_a  \arrow [dr,dash]    \&  \&  \arrow[dl,dash] \tau_b  \& \\
\& \chi \& \& \text{\footnotesize coarser} \arrow[uuu]
\end{tikzcd}
\end{equation*}


The idea is that there should be an arrow on the side of the diagram connecting "coarser" to "finer"; however, the arrow does not go up three rows as instructed, but seems instead to end one row up, one to the left.

How can I fix this?

• Your levels count is wrong: replace \arrow[uuu] with\arrow[uu]. – Bernard Jun 29 '18 at 16:08

You just had one u too much.

\documentclass{article}
\usepackage{amsmath,tikz-cd}
\begin{document}
\begin{equation*}
\begin{tikzcd}[ampersand replacement=\&, column sep=small, row sep=small]
\&  \arrow[dl,dash] d \arrow [dr,dash]  \&  \&  \text{\footnotesize finer} \\
\tau_a  \arrow [dr,dash]    \&  \&  \arrow[dl,dash] \tau_b  \& \\
\& \chi \& \& \text{\footnotesize coarser} \arrow[uu]
\end{tikzcd}
\end{equation*}
\end{document}