# Commutative diagram using TikZ

\begin{tikzcd}
A \arrow{rr}\arrow{dr} &              & B \arrow{rr}\arrow{dl} & & C \\
& D \arrow{dr}                                \\
&              & E
\end{tikzcd} In the above code, how do I draw an arrow from C to E?

• Thanks @marmot for your reply, but it does not work.... – puzzled Jan 8 at 19:43
• I edited your code so now you can guess the direction for the desired arrow. – Sigur Jan 8 at 20:52
• By the way, there is an extra column unnecessary before C. Your diagram could have four columns, so three & is enough. – Sigur Jan 8 at 20:54
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## 1 Answer

You need \arrow[ddll].

Here's a version with parallel arrows, due to the between origins specification. I added an example where the objects are wider; you may want to increase the column separation, but you have to decide it only after seeing the result.

\documentclass{article}
\usepackage{amsmath}
\usepackage{tikz-cd}

\begin{document}

$\begin{tikzcd}[column sep={3em,between origins}] A \arrow[rr]\arrow[dr] && B \arrow[rr] \arrow[dl,dashed] && C \arrow[ddll] \\ & D \\ && E \arrow[ul] \end{tikzcd}$

$\begin{tikzcd}[column sep={3em,between origins}] \bigoplus_i A_i \arrow[rr]\arrow[dr] && \prod_j B_j \arrow[rr] \arrow[dl,dashed] && C \arrow[ddll] \\ & D \\ && E \arrow[ul] \end{tikzcd}$

\end{document} • Yes, much better than my answer (which I did not mean to write anyway). +1 – user121799 Jan 8 at 21:40