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This question already has an answer here:

I want to draw a rectangle commutative diagram, but I do not know how. The MathJax codes I find on the internet do not work here. I tried the following:

$\xymatrix
\mathbb{Z}/p^n\mathbb{Z}\ar[r]^{\theta_{n+1,\alpha}} \ar[d]  U_1/U_{n+1}\ar[d]  \\
\mathbb{Z}/p^{n-1}\mathbb{Z} \ar[r]^{\theta_{n,\alpha}}  \\ 
U_1/U_n 
$
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marked as duplicate by Xam, Shailesh, José Carlos Santos, Glorfindel, Harambe Nov 11 '17 at 9:32

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

  • $\begingroup$ Older question: How to draw a commutative diagram? (You can find there link to the presheaf site. If you are used to xypic syntax, a possibility is to use that website and include the picture in the post.) $\endgroup$ – Martin Sleziak Nov 6 '17 at 4:24
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The package you want to use is not supported on this site, sorry. You could use AMScd instead:

$\require{AMScd}$
\begin{CD}
\mathbb{Z}/p^n\mathbb{Z} @>{\theta_{n+1,\alpha}}>> U_1/U_{n+1}\\
@VVV @VVV\\
\mathbb{Z}/p^{n-1}\mathbb{Z} @>{\theta_{n,\alpha}}>> U_1/U_n
\end{CD}

$\require{AMScd}$ \begin{CD} \mathbb{Z}/p^n\mathbb{Z} @>{\theta_{n+1,\alpha}}>> U_1/U_{n+1}\\ @VVV @VVV\\ \mathbb{Z}/p^{n-1}\mathbb{Z} @>{\theta_{n,\alpha}}>> U_1/U_n \end{CD}

I hope I got it right; I just read your source and my brain is not the most reliable compiler.

For some more details see the relevant answer in the main MathJax thread.

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  • $\begingroup$ Thank you. You got it right! $\endgroup$ – Cornman Nov 5 '17 at 21:41
  • $\begingroup$ You are welcome. I am glad to know it worked out. $\endgroup$ – quid Nov 5 '17 at 21:42

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