# xymatrix/commutative diagrams [duplicate]

Possible Duplicate:
How to draw a commutative diagram?

Today i wanted to include a drawing of a commutative diagram in my answer on math.stackexchange.com - but did not find any way of doing that.

Isn't there yet such a thing to render $$\xymatrix{\ar @{} [dr] |{\#} P \ar[r]^f \ar[d]_\pi & P \ar[d]^\pi \\ M \ar[r]_{\bar f} & M }$$ or is it that i used the wrong syntax. If it is not included i would make this a feature request.

• xy and similar packages aren't implemented in MathJaX, yet. See here for the list of available commands and see also this discussion on meta.MO. – t.b. Dec 15 '11 at 10:30
• Another related thread – t.b. Dec 15 '11 at 10:30
• shall i delete it as it really is a duplicate? – epsilonhalbe Dec 15 '11 at 11:09
• As you wish. I would probably leave it to document that it is requested from time to time. Nothing worse can happen than that the thread is closed as a duplicate. By the way: when I need a diagram, I sometimes create it in a LaTeX document on my computer and upload a screen shot. – t.b. Dec 15 '11 at 11:19
• ah good idea to draw and screenshot it - will do that from now on if i've got time. – epsilonhalbe Dec 15 '11 at 11:24
• @epsilonhalbe Deleting the question would make it impossible for you to receive further helpful comments such as those above (and this), cf. my post here.. – Bill Dubuque Dec 15 '11 at 18:08