> BTW, you need a .br on a line between your first .EQ and the
> second .EN. Otherwise the two equations will be run together.
Not necessarily. It depends on how your EQ/EN macros are defined.
In the simplest case you can define
.de EQ
.sp .5
.ce 1
..
.de EN
.sp .5
..
For something more fancy, try
.de EQ
.br
.nr xx \\n(.n
.nr EQ +1
.di XX
..
.de EN
.br
.di
.nr =^ \\n(.l-\\n(.i
.ie \w'\\*(10'<(\\n(.l-\\n(.i-(2*\\n(xx)-2m) \{\
.ne \\n(dnu
.\}
.el \{\
.ne \\n(dnu+.5v
.sp .5v
.\}
.ta \\n(.lu/2uC \\n(.luR
\t\\*(10\t(\\n(EQ)
.sp .5v
.ns
..
which gives you automatic equation numbering
(and also makes the spacing nicer).
