I was said that tikszcd is good library to draw commutative diagrams. So I tried to practize it by drawing the diagram in https://math.stackexchange.com/questions/383006/0-rightarrow-m-rightarrow-m-rightarrow-m-rightarrow-0-exact-m-flat/494914#494914 . But how can I get the arrow from zero to M''(x)N'? I tried

& 0\arrow{d}\\
0\arrow{r} & M^\prime\otimes N^\prime

but it gave me mess.


Here are two solutions, one using tikz-cd the other using the psmatrix environment from pst-node. I could adjust the position of the vertical arrows with pst-node, which I don't know how to do with tikz-cd:



\[ \begin{tikzcd}
 & & & 0 \arrow{d}\\
0 \arrow{r} & M'\otimes N' \arrow{r}\arrow{d} & M\otimes N' \arrow{r}\arrow{d} & M''\otimes N' \arrow{r}\arrow{d} & 0\\%
0 \arrow{r} & M'\otimes N\arrow{r} & M\otimes N\arrow{r} & M''\otimes N \arrow{r} & 0 


enter image description here


 \[ \psset{arrows=->, arrowinset=0.25, linewidth=0.6pt, nodesep=3pt, labelsep=2pt, rowsep=0.7cm, colsep = 1.1cm}
%%% nodes
 & & & 0\\
0 & M'\otimes N' & M\otimes N' & M''\otimes N'\hphantom{'} & 0\\%
0 & M'\otimes N\hphantom{'} & M\otimes N\hphantom{'} & M''\otimes N\hphantom{''} & 0
 %%% horizontal arrows
 \ncline{2,1}{2,2} \ncline{2,2}{2,3} \ncline{2,3}{2,4} \ncline{2,4}{2,5}
 \ncline{3,1}{3,2} \ncline{3,2}{3,3} \ncline{3,3}{3,4} \ncline{3,4}{3,5}
 %%% vertical arrows
  \ncline[offset=0.8pt]{2,2}{3,2} \ncline[offset=-0.6pt]{2,3}{3,3} \ncline[offset=0.6pt]{2,4}{3,4}


enter image description here

  • Hmm. I only got package ifplatform Warning and package auto-pst-pdf Error. – student Jan 17 '15 at 15:59
  • @student: I forgot to say you can compile pstricks code with pdflatex if you set the switch --enable-write18 ifd you're under MiKTeX, or shell-escape (TeX Live, MacTeX), for the compiler. – Bernard Jan 17 '15 at 16:10
  • @student If you only use the tikz-cd version, you don't need \usepackage{pst-node}. In my opinion this answer is not very well laid out: there should be the code for the tikz-cd version and the pst-node version should be in a separate example document. – egreg Jan 19 '15 at 8:53

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.