[Xy-pic] Loop arrow in xymatrix

Vadim Radionov vadim.radionov at gmail.com
Thu Jul 29 17:29:35 CEST 2010

Dear list members,

I once again forgot how to use XYpic.  Can you help me with the following:

\documentclass{amsart}
\usepackage[arrow,matrix,curve,dvips]{xy}
\begin{document}
\xymatrix{(6,3,2,4,1,5) \ar@(ul,ur) \ar[d]  \\ ( 4,2,5,1,6,3)  }
\end{document}

This works. When I change \ar@(ul,ur) to \ar@(ur,dr), it does not.  Is it
because most part of the arrow intersects with the cell?
In this case, how can i shift the loop arrow to the right?

Thank you in advance,
Vadim
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