> \hbox \bgroup $\beginR
but couldn't you just do
\hbox \bgroup \beginR$
to get the same, but working with older engines?
> I will look at longtable and see if the same kind of thing can be done there.
I don't have it here but can you put \beginR at the start of $$ and
still have a display \halign? if so you could easily make longtable do
the right thing....
$$\beginR\halign{&#\hfil\cr a&b&c\cr}\endR$$
?
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