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I'm using the \usepackage{tikz-cd} and I'm trying to make a commutative diagram.

Why doesn't this simple code work?

$$ \begin{tikzcd}
A \arrow {rd}{f} \arrow{r}{\phi} & B \\ 
& C 
\end{tikzcd}
$$

I can't find a problem with this, but it won't compile?

closed as unclear what you're asking by egreg, Marijn, Phelype Oleinik, Mensch, user156344 Apr 17 at 2:09

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    if you get an error please post a small complete document and also show the exact error message from the log that you get from your test file. – David Carlisle Apr 16 at 19:55
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    No error if I add a standard preamble. – egreg Apr 16 at 21:24