TeX math inclusion?

I want to include some equations from TeX originals in my
DocBook document.  I can rasterize them and include them as
.jpgs, but they look rather tacky.  I'd prefer to include
them in some kind of vector form.

I tried using pdftex to make .pdf files, but those don't
seem to play well with DocBook.  The equations appear in a
microscopic size at the wrong place on the page, when they
appear at all.

What's the best route from TeX to something vectorized
that plays well with DocBook?

Best regards,
John Shipman (), Applications Specialist, NM Tech Computer Center,
Speare 119, Socorro, NM 87801, (505) 835-5950, http://www.nmt.edu/~john
  ``Let's go outside and commiserate with nature.''  --Dave Farber