[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:


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


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 $$...$$.


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