I would like to reproduce this figure:
What Package(s) could I use to create the top image?
Thanks.
Using xypic, my best attempts looks like
or
Notice how the longer formula on the second line stretches out the top line. Graphics, Figures & Tables ⇒ Creating Nice Commutative Diagrams
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Creating Nice Commutative Diagrams
Have you tried using tikz-cd which helps in drawing commutative diagrams? Of course, I have never used it as I do not need commutative diagrams 

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- Stefan Kottwitz
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Creating Nice Commutative Diagrams
mas' suggestion is very good. I also used pure TikZ for it. Examples:
tikz-cd gives a convenient way and hides the complex TikZ syntax. But TikZ is great, you may see it if you click the examples and look at the rest of that TikZ gallery.
Stefan
tikz-cd gives a convenient way and hides the complex TikZ syntax. But TikZ is great, you may see it if you click the examples and look at the rest of that TikZ gallery.
Stefan
LaTeX.org admin