# Tagged Questions

{xy-pic} is a package for typesetting graphs and {commutative-diagrams} using the principle of "logical composition of visual components."

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### How do you draw the “snake” arrow for the connecting homomorphism in the snake lemma?

How does one draw the "snake" arrow for the connecting homomorphism when using the snake lemma? I'd also be interested in drawing similar arrows act as "carriage returns" when considering a long ...
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### Commutative Diagrams

Can anyone help me in giving commands for commutative diagrams in LaTeX ? It doesn't seem to appear properly in the LaTeX guides that I have. A command for a simple triangular diagram with arrows ...
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### How to make nice braids diagrams

This question led to a new package: braids — Blog: The Braids Package I search to draw braids diagram, if possible in xy-pic. I already know how to do that with the knot module and some low-level ...
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### Bending snakes with xy-pic

This is a follow-up to this question: How do you draw the "snake" arrow for the connecting homomorphism in the snake lemma? I'm trying to emulate this snake diagram Aluffi does in his book "...
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### Natural transformation arrow

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....
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### misdirected xymatrix arrow heads with certain fonts

I'd like to use $\mathsf{C}$ rather than $\mathcal{C}$ for categories. However, when I use the former in the first displayed equation, the top arrowhead (the arrow labelled L) points northwest, rather ...
Let us consider the following example: \documentclass{book} \usepackage[all]{xy} \begin{document} $\xymatrix{A\ar[rr] && B}$ \end{document} This produces but I want the following ...