[texhax] xymatrix question

Michael Barr barr at math.mcgill.ca
Mon Jan 28 14:58:33 CET 2008

First, let me suggest that such questions are more appropriate for the 
xy-pic help group (xy-pic at tug.org) than texhax.  The answer to your 
specific question is to enclose the argument in a \vcenter:

This is also useful if you want to put an \eqno that is vertically 
centered, e.g.:

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