I'm using the xymatrix
package (which I think is more friendly than tikz package), and I've been trying to do a simple triangle diagram with a circle arrow in the middle. I mean, I've done this one:
\documentclass{article}
\usepackage[all]{xy}
\begin{document}
$\xymatrix
{ & \mathcal{L} \ar[dl]_{\pi_j} \ar[dr]^{\pi_i} & \\
G_j \ar[rr]_{\pi_i^j} & & G_i
}
$
\end{document}
and I want to add a circle arrow in the middle. I've tried to add rows, but the diagonal arrows became crazy, and the result is awful.