An improved version of my posting on GA, comparing the Gibbsian and
Quaternion solutions of the Kepler problem, is now available at: http://gate.hep.anl.gov/jlu/quatern.pdf
Regards,
Jack
--
"What did Barrow's lectures contain? Bourbaki writes with some
scorn that in his book in a hundred pages of the text there are about 180
drawings. (Concerning Bourbaki's books it can be said that in a thousand
pages there is not one drawing, and it is not at all clear which is
worse.)"
V. I. Arnol'd in
Huygens & Barrow, Newton & Hooke
This posting is the position of the writer, not that of SUNY-BSC, NAU or the AAPT.