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Is there an easy way to draw a split exact sequence in tikz cd (that is, with an arrow going from A to B, and a reverse arrow going from B to A)? There is obviously a way to do this with the full tikz, but this is a little painful...

EDIT to answer the comment, the picture should look something like this:

enter image description here

(just the T-> PO part, Except I would prefer the back arrow to curve less)

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  • Welcome to LaTeX! Welcome to TeX.SX! Could you please elaborate on what you want drawn? Perhaps find an illustration or draw one.
    – JP-Ellis
    Feb 29, 2016 at 14:13
  • @JP-Ellis I added an illustration, thanks!
    – Igor Rivin
    Feb 29, 2016 at 14:20

1 Answer 1

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There is nothing which could not be found in the tikz-cd-manual, but here you are:

% arara: pdflatex

\documentclass{article}
\usepackage{tikz-cd}
\usepackage{mathtools}
\usepackage{amsfonts}

\begin{document}
\begin{tikzcd}
    0\arrow{r} & \mathbb{R}\arrow{r}{t}\arrow{d}{\mathcal{P}} & X\arrow{r}{\pi}\arrow{d}{s} & G\arrow{r}\arrow[equal]{d} & 0 \\
    0\arrow{r} & \mathbb{T}\arrow{r}{r} & \text{PO}\arrow{r}\arrow[bend left=33]{l}{\varphi} & G\arrow{r} & 0
\end{tikzcd}
\end{document}

enter image description here

As you want to reduce the bending radius, I have put the label r above. If you want the look of your screenshot, just do \arrow{r}[swap]{r}!

If you want to have a bending less than 33, you will encounter this bug.

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  • Thanks! I actually did not see anything exactly like this in the manual (and so I was afraid of all sorts of unpleasantness).
    – Igor Rivin
    Feb 29, 2016 at 14:57

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