# 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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### 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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### Does anyone have a script that will convert \xymatrix to tikzcd?

I have a long set of lecture notes where the commutative diagrams are written in xy using the \xymatrix format. I would like to switch over to tikz-cd. The syntax for the two are pretty similar with ...
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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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### Pushouts and pullbacks

How do I typeset that little symbol which indicates that a commutative square is a pushout or pullback square? I usually draw my diagrams in XY-pic, so I'd be most interested in how to do it there. ...
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### Circling a collection objects in xymatrix

I have the following code that produces a bicomplex: \begin{displaymath} \xymatrix{ 0 \ar[r] & \Omega^0_X \ar[d] \ar[r] & \Omega_X^1 \ar[r] \ar[d] & \ldots \ar[r] & \Omega_X^n \ar[d] \...
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### Vertical cofibration arrow in xypic

I want to use xypic to make diagrams using vertical cofibration arrows, i.e. ones that look like $\rightarrowtail$. Naively using \ar@{>->} gives an arrow whose tail overlaps with the ...
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### Commutative diagram with rounded arrows

I want to draw a diagram which has some arrows between to points A and B. First arrow goes straight from A to B and above it should be a $\Psi$. Second arrow goes in a round way from A to B and above ...
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### Using etoolbox to automatically generate input for \xymatrix

I'd like to make a command \exactseq such that, for example, \exactseq{A,f,B,g,C} corresponds to \xymatrix{A \ar[r]^{f} & B \ar[r]^{g} & C} and such that this works for inputs of ...
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### How to draw a braid of long exact sequences

For example, in page 353 of Ranicki's book Algebraic and geometric surgery, there is a braid of long exact sequences like so: I use xy-pic. Thanks in advance!
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### How do I make the arrow -->— using xymatrix?

I do not know any TikZ so I cannot use this post, which otherwise is precisely what I am looking for. So how do I make such a square? The best I could come up with was \ar@{-}[r]^{\delta}|-{>} ...
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### Can't draw a commutative diagram

I'm trying to draw a commutative diagram using xymatrix: $\xymatrix{ S \ar@[ld]^{\pi_{i}} \ar@[rd]^{\pi_{j}}\\ R_{i} \ar[r]_{\mu_{ji}} & R_{j} }$ without any luck. Any idea? EDIT: I'm trying ...
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### Which package should I use for doing a connecting homomorphism diagram like this in latex

which package should I use for doing a diagram like this in latex:
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### Bending arrows in xy-pic

This question almost duplicates Bending snakes with xy-pic, but I need something slightly different from the solutions presented there. I spent some time trying to figure out how arrow bending works ...
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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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### Using xy-pic, how do you label an arrow with a curly brace that spans the length of the arrow, and can be offset arbitrary distances?

I'm trying to figure out how to label the arrows with curly braces that span the length of the arrow, and to make it all very pretty. More specifically, I'm trying to make \documentclass[10pt]{...
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### Convenient way of typesetting boxes with multiple input and output wires?

I want to typeset diagrams describing functions which take multiple inputs and return multiple outputs. These should look like boxes with labels in them like "f" or "g" and with some input wires ...
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### Matrices as labels in xymatrix

How can I use a matrix as label in the xymatrix environment? I tried to nest matrices (naively) but it seems to be rather complicated. \xymatrix{ A \ar[r]^{\xymatrix{f \\ g}} & B }
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### xymatrix is broken when inside section

If I use xymatrix inside of a section command, it doesn't compile. Example: \documentclass{article} \usepackage[all,cmtip]{xy} \begin{document} \section{$\xymatrix{A\ar[r]&B}$} \end{document} ...
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### Wavy arrows in xy-pic

What method should I use, to draw beautiful wavy arrows. So far I tried the following. I use xy-pic package, there I use @{~>} definition for the arrow. The code I've composed is like this: \...
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### Set Braces in XYPic, XYMatrix

I want to add three braces to a xymatrix in a xypic environment. Here's how I got so far. \documentclass[11pt]{article} % use larger type; default would be 10pt \usepackage[all]{xy} \begin{document} ...
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### Cannot draw diagram

I'm trying to draw a diagram but I get the following error message: ! Xy-pic error: in entry "1,1": No [ld] (is "2,0") from here. The code is: \xymatrix{A\times B \ar[ld]_p \ar[rd]_q\\ &...
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### How to center xymatrix with respect to logical center?

I have an \xymatrix with 4 rows and 2 columns. I want to center it horizontally. I used \centerline{} but it (of course) just centers the whole box created by \xymatrix. Since my matrix entries are ...