# rectangular and triangular commutative diagram with curves

Here is the diagram I want to draw: Could anyone help me in drawing it please?

the curved arrows and the diagonal arrows, I do not know how to do this.

• Did you try something already? Please share a complete MWE to help us help you. Your previous question has been answered, you could learn a bit from that in order to produce a functionnal tikzcd graph. Mar 30 at 11:58
• Yeah I know how to draw a part of the diagram @SebGlav I will update my post with it. Thanks for your comment. Mar 30 at 12:55
• You still don't have a working example. You need \usepackage{tikz-cd}. Which diagonal and curved arrows do you want? Your example is nothing like your hand-drawn picture. Mar 30 at 13:23
• Ok, let me correct it, sorry.@SandyG Mar 30 at 13:30

Curved arrows can be made using bend left or bend right. Use ur in the \arrow command to have the arrow point up one row and right one column. Similarly, uurr will go up 2 rows and right two columns. \documentclass{article}

\usepackage{tikz-cd}

\begin{document}

\begin{tikzcd}
& & D_{c(f)}\\
R\arrow[r] & \pi_{\alpha}D_{\alpha}\arrow[r,yshift=2pt,"c"]\arrow[r,yshift=-2pt,"d"']\arrow[ur]\arrow[d] & \pi_fD_{c(f)}\arrow[d]\arrow[u,"\pi_f"']\\
C\arrow[r]\arrow[rr, bend right,"F"']\arrow[ur]\arrow[u,dashed,"\exists!"]\arrow[uurr,bend left,"F"] & D\arrow[r] & E
\end{tikzcd}

\end{document}

• What if I need to reverse all the directions of the arrows? Mar 30 at 13:35
• @Idonotknow: You can use dl for "down-left". Similarly ddll is "down-down-left-left". Or you can add [arrows=<-] after \begin{tikzcd}. Mar 30 at 13:44
• @Idonotknow I strongly suggest that you read the tikz-cd manual where you would find many very intersting informations about how to draw those (relatively) simple graphs. Mar 30 at 13:51