Changing the style of an 1-cell inside a 2-cell diagram, in xy

Asked Sep 20 '17 at 10:01

Active Jun 23 '18 at 08:35

Viewed 65 times

Is it possible to modify the style of the arrows in a 2-cell in xy?

\documentclass{standalone}
\usepackage{amsmath,amssymb,amsfonts}
 \usepackage[all,2cell]{xy}
 \UseAllTwocells
\begin{document}
\xymatrix{
&B \ar[d]^g\dllowertwocell^{fg}_{1}{\epsilon} \\
B \ar[r]_g  \ar[ur] & A
}

\end{document}

I would like the codomain of \epsilon to be drawn as an identity, since it is one. \dllowertwocell@{=}^{fg}_{1}{\epsilon} has, of course, no effect since it is impossible to tell xy which arrow must be modified. Also, even the command that says at which point to put the label (let's say \ar[r]^(.25){f}) doesn't work.

edited Jun 23 '18 at 08:35

asked Sep 20 '17 at 10:01

fosco

1,253

Sure, I did it (whoops, it's rather big) – fosco Jun 23 '18 at 08:36
Well, I know how to solve the problem in tikz-cd. My question was whether xy offers this possibility too. – fosco Jun 23 '18 at 08:38
4

I'm voting to close this question because the OP has solved your question using tikz-cd. – Sebastiano Aug 04 '19 at 21:32

Changing the style of an 1-cell inside a 2-cell diagram, in xy

0 Answers0