# [Xy-pic] Descent of displaymode

Michael Barr barr at math.mcgill.ca
Wed Oct 24 22:25:08 CEST 2007

Is there any way of getting displaymode to descend into xy-pic?  Here is a
sample file:

\documentclass{article}
\usepackage[arrow]{xy}
\begin{document}

$\xy \POS(0,0)*+!!<0ex,.55ex>{\prod_{i\in I}L_i}\ar@{>} (0,-20)*+!!<0ex,.55ex>{\prod_{j\in J}L_j}% \endxy$

\end{document}

The subscripts look silly.  Of course, I write \prod\limits_{i\in I}L_i,
but that is a nuisance.  Is there any way of making that the default.  Of
course, I don't want \limits built-in, only for macros that normally do it
in displaymode.  It makes no difference, incidentally, if you use $...$
or $$...$$.

Michael