tried to use display_matrix_mm from PGmatrixmacros.pl (Webwork 1.9) It
was unable to display matrices in which the entries were in math mode,
as of course they normally would be. I eventually discovered that each
matrix entry was being placed inside an mboxtrue. Trying to work around
this proved difficult, so I finally just changed the macro to eliminate
the mbox, and at least on the example I was using, it seems to work ok.
Why in the world would an mbox be desired in this situation? The normal
case is that matrix entries would be in math mode, and relatively short
at that. mbox does exactly the wrong thing.
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