Re: -ms anomaly

[Tadziu Hoffmann]

> Nevertheless, -ms is misinterpreting the output of eqn in this
> case.

It appears to be intentional.  At least in groff's implementation
of the ms macros, the first call to a paragraph macro is special,
in that it terminates the front matter and begins the body text,
and redefines a number of macros in the process, including EQ/EN.
(Setting off the equation on a line of its own is the job of the
EQ/EN macros, not of eqn.)