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How to draw a commutative diagram?

Some times when we want to describe diagrams in category theory such as $$\xymatrix{ U \ar@/_/[ddr]_y \ar@/^/[drr]^x \ar@{.>}[dr]|-{(x,y)} \\ & X \times_Z Y \ar[d]^q \ar[r]_p & X \ar[d]_f \\ & Y \ar[r]^g & Z }$$, we are used to use xypic package. However, it is not available now. So is there another way to draw diagrams?


marked as duplicate by Rahul, Dylan Moreland, Arturo Magidin, Willie Wong Jun 12 '12 at 8:00

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  • $\begingroup$ This has already been asked and answered on this meta.math.SE post. $\endgroup$ – Zev Chonoles Jun 11 '12 at 16:29
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    $\begingroup$ Not a very nice solution, but you could also make the commutative diagram on you computer, convert it with dvipng or something similar and upload the image. $\endgroup$ – Martin Sleziak Jun 11 '12 at 16:35
  • $\begingroup$ OK, I see. Thank you two. But I still recommend to add a package since in comment it does not allow us to add a image, and the limit of characters probably restrict us to draw a huge diagram. $\endgroup$ – Popopo Jun 11 '12 at 16:56
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    $\begingroup$ @Popopo: I don't think "adding the package" is something that can be done at the math.SE, or even the StackExchange level: that would be something to bring up with the MathJax folks, if I'm not mistaken. $\endgroup$ – Arturo Magidin Jun 12 '12 at 3:21

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