# Commutative diagram with blank spacing and crossing-layer arrows

Related to a previous post, now pardon me to go to a specific example,

here is my output and my Minimum Working Environment

\documentclass[onecolumn,amsmath,amssymb,nofootinbib,superscriptaddress,floatfix]{revtex4}
\begin{document}

$$\begin{CD} 1+1 @>>> 2+1 @>>> 3+1 @>>> \dots @>>> d+1 \dots\\ 12 @<<< 123 @<<< 1234 @<<< \dots @<<< 123(d+1)\\ @| @| @|\\ @>>> xy @<<< xyz @<<< \end{CD}$$

\end{document}


Question: what I wish is that the similar diagram as above: but having the following conditions:

(i) all the leftarrow @>>> removed, but keeps the same spacing as before.

(ii) all the down equal line removed @| removed, but the same (or smilier) spacing

(iii) connecting xyz to 12 from the right to the left arrow (<---)

(iii) may be challenging, so it is fine to neglect this (iii), and your reply on (i)(ii) still count as an answer.

Thank you, any comment is welcome and helpful! :)

• You could have waited for my answer on the previous post: I did promise to write an answer! Does my answer in that post help you with this one? I think all you need to is replace by @. and that is it! Edit: I don't think you can do slant arrows in AMSCD package! I am writing a quick tikz-cd answer to this question!
– kan
May 27 '14 at 17:51

Since this question is tagged , here is a tikz-cd answer:

\documentclass{amsart}
\usepackage{tikz-cd}
\begin{document}
\begin{tikzcd}
1+1 & 2+1       & 3+1        & \cdots       & d + 1 \\
12  & 123 \ar{l}& 1234 \ar{l}& \cdots \ar{l}& 123 \dots (d+1) \ar{l}\\
& xy \ar{ul}& xyz  \ar{l}& \ar{l}
\end{tikzcd}
\end{document}


The output: Update: Here is an answer with xypic as you asked in the comments:

\documentclass{amsart}
\usepackage[all]{xy}
\begin{document}
$\xymatrix{ 1+1 & 2+1 & 3+1 & \dots & d + 1 \\ 12 & 123 \ar[l]& 1234 \ar[l]& \cdots \ar[l]& 123 \dots (d+1) \ar[l]\\ & xy \ar[ul]& xyz \ar[l]& \ar[l] }$
\end{document}


The Output: • @ Kan, thanks, it is pretty clear! +1. May 27 '14 at 18:24
• but excuse me what if I also need an arrow from xyz to 12. Not just xy to 12? May 27 '14 at 18:27
• also, I cannot compile it successfully, via \documentclass[onecolumn,amsmath,amssymb,nofootinbib,superscriptaddress,floatfix,amsart]{revtex4} May 27 '14 at 18:28
• I could not compile it even using your set-up: \documentclass{amsart} \usepackage{tikz-cd} May 27 '14 at 18:29
• @Idear, what is the error message: something like missing package? It would help if you tell me the version of TeXLive or MikTeX that you may be using?
– kan
May 27 '14 at 18:36