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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.

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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. – lentic catachresis 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
up vote 8 down vote accepted

The 2cell module is what you need:


\mathsf{CRing} \rtwocell^{\mathsf{GL}_n}_{U}{\;\;\;\det} & \mathsf{Grp}
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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? – lentic catachresis Jan 21 '12 at 0:55
@BrunoStonek \rtwocell<6>...; page 45 of xyrefer.pdf – egreg Jan 21 '12 at 1:00
Thank you very much! – lentic catachresis Jan 21 '12 at 1:02

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