# 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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### labeling diagrams with matrices

I it possible to label an arrow with a matrix in Xy-pic? In the following diagram I want to label the arrows with 2x2 matrices to represent linear maps between vector spaces, in the place of a,b and ...
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### How to show the “commutate” symbol inside a diagram in LyX?

I am using this code $$\xymatrix{ z\in\ar@{|->}[d] & \mathbb{C}\ar[r]^{f}\ar[d] & \overline{\mathbb{C}}\\ {}[z]\in & \mathbb{C}/L\ar[ru]_{\hat{f}} }$$ to generate this ...
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### Resizing the vertices inside xymatrix

Does anyone know how to resize the names of entries which appear as vertices inside \xymatrix? I have huge commuative cubes with more then 40 inner or outer vertices and when these names become too ...
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### XY-pic not sufficiently expressive to draw a simple linked list (data structure)? [duplicate]

Possible Duplicate: How should I draw a singly/double linked list? I am using xypic to draw a linked list. It consists essentially a sequence of chained 2-cell boxes. The problem is how to put ...
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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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### xypic: Text inside square

I have a very basic square: \xymatrix{ A \ar[r] \ar[d] & B \ar[d] \\ C \ar[r] & D } What is the easiest way to place the text "hi" in the center of the square?
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### How does one use math operators in xy-pic?

I am trying to format some large commutative diagrams (using the \xymatrix command) that involve colimits, and I would like to have the indexing information for the colimits appear underneath the word ...
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### Changing color of \dir in xypic

I'm trying to use \dir to draw custom frames in an XYpic drawing, but have been unable to figure out how to change the color of the line drawn by each command. For instance, to draw a triangle frame, ...
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### ways to indicate commutativity and non-commutativity of a diagram when using xymatrix

I used the following code, but \circlearrowleft looks no good in this diagram. I would like to know if there is a better way to indicate the commutativity. Also, is there any way to indicate non-...