5

Can someone help me please? I'm wondering how to draw this diagram with LaTeX. Thanks.

enter image description here

  • 8
    Welcome to TeX.SE! Such things can be drawn very conveniently with tikz-cd. – user121799 Jan 6 at 22:53
  • 2
    Try \documentclass{article} \usepackage{tikz-cd} \begin{document} \begin{tikzcd} A \arrow[r,"b"] \arrow[d,"g"] & C \arrow[r,"\alpha"] \arrow[d,"\beta"]& D \arrow[d,"\gamma"]\\ B \arrow[rru,"h"] & B' \arrow[r,"\omega"] & D' \end{tikzcd} \end{document} – user121799 Jan 6 at 22:59
  • @marmot You're flash. I lost many times with Captcha. :-( – Sebastiano Jan 6 at 23:08
  • 1
    @Sebastiano Slow marmots get caught by the eagles. – user121799 Jan 6 at 23:09
8

You can easily draw your diagrams with the free online tool tikzcd-editor.

Screenshot:

enter image description here

Generated Code by clicking the {} button (not an MWE):

\begin{tikzcd}
A \arrow[d, "g"] \arrow[r, "f"] & B \arrow[r, "\alpha"] \arrow[d, "\gamma"] & D \arrow[d, "\beta"] \\
C \arrow[rru, "h"] & B' \arrow[r, "\lambda"] & D'
\end{tikzcd}

Link to live example

  • 1
    Certainly a very nice tool, where can you find the instructions for use? – AndréC Jan 7 at 16:50
11

Here is a proposal.

\documentclass{article} 
\usepackage{tikz-cd}
\begin{document}
\begin{tikzcd}  
A \arrow[r,"b"] \arrow[d,"g"] & C \arrow[r,"\alpha"] \arrow[d,"\gamma",pos=0.4,swap]& D \arrow[d,"\beta"]\\
B \arrow[rru,"h",pos=0.7,swap] & B' \arrow[r,"\omega"] & D'
\end{tikzcd}
\end{document}

enter image description here

I added the proposal to prove that users are willing to help. However, the purpose of this site is not to get screen shots converted to LaTeX code. Rather, the idea is that you try something, and if you get stuck, you have a code that you can show and others will help you solve that problem.

9

My code is only "basic".

enter image description here

\documentclass{standalone}
\usepackage{tikz-cd}
\begin{document}
\begin{tikzcd}
A \arrow[r, "f"] \arrow[d, "g"'] & B \arrow[r, "\alpha"] \arrow[d, "h"'] & D \arrow[d, "\beta"] \\
C \arrow[rru, "\gamma"'] & B' \arrow[r, "\lambda"'] & D'
\end{tikzcd}
\end{document}
8

Another possibility is with pstricks– more precisely the psmatrix environment:

\documentclass[border=8pt]{standalone}

\usepackage{pst-node, auto-pst-pdf}

\begin{document}

 $ \begin{psmatrix}[colsep =1.2cm, rowsep=1.2cm, nodesepA=2pt, nodesepB=1pt, shortput=nab, labelsep=1pt, arrows=->, arrowinset=0.12, linewidth=0.6pt]
A & B & D \\
C & B' & D'
%% horizontal maps
\ncline{1,1}{1,2}^{b}
\ncline{1,2}{1,3}^{\alpha}
\ncline{2,2}{2,3}_{\lambda}
%% oblique map
\ncline{2,1}{1,3}\naput[npos=0.7]{h}
%% vertical maps
\ncline{1,1}{2,1}<{g}
\ncline[border=1pt]{1,2}{2,2}\nbput[npos=0.35]{\gamma}
\ncline{1,3}{2,3} >{\beta}
\end{psmatrix} $

\end{document} 

enter image description here

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