I'm trying to do the following with xymatrix:


This is a diagram I drew sometime ago... But now I don't have the source and I can't remember how I did it, nor can I find an easy, simple way to do it.

More specifically, what I forgot how to do is the vertical arrow in the middle.

  • Are you interested in other ways of drawing such diagrams, for example in TikZ? If yes, we could show how this example would look with TikZ, or PSTricks. – Stefan Kottwitz Jan 21 '12 at 9:54
  • @Stefan: Personally, I use xymatrix and I'm happy with it, but perhaps it is valuable to the community that the question be answered most completely; I'll leave it to your judgement. Thank you for the interest. – Bruno Stonek Jan 21 '12 at 12:42
  • I just wanted to show you possibilities, and well readable syntax and fine output of TikZ. No need to extend if you don't really wish it. – Stefan Kottwitz Jan 21 '12 at 12:48

The 2cell module is what you need:


\mathsf{CRing} \rtwocell^{\mathsf{GL}_n}_{U}{\;\;\;\det} & \mathsf{Grp}
  • 1
    I really used this? My (lack of) memory amazes me. Thank you, this is nice. However, how could I get the arrows to curve a little bit more? – Bruno Stonek Jan 21 '12 at 0:55
  • 2
    @BrunoStonek \rtwocell<6>...; page 45 of xyrefer.pdf – egreg Jan 21 '12 at 1:00

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