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*              Quantum Field Theory Course Announcements            *
*                  Georgia Institute of Technology                  *

I put
	Freeman J. Dyson, The World on a String
on the course homepage. Because of copyrights, you will need to
log on:
	student		Lautrup

That is just for your personal pleasure.

---- for character building:
If you want to work through my presentation of group theoretical
projection operators, the method is in the appendix A of
	http://www.cns.gatech.edu/FieldTheory/QMlectures/lectQM.pdf
(text identical to the version posted in January), or in Sect 3.6 of
	ChaosBook.org/GroupTheory

---- curiosity:
Interestingly enough, a former professor at Georgia Tech wrote identical
appendix (!) independently of myself in

W.~G.~Harter and N.~Dos Santos,
        ``Double-group theory on the half-shell and the two-level system.
          I. Rotation and half-integral spin states,''
        {\em Am. J. Phys. \bf  46}, 251 (1978).
available on
	ChaosBook.org/GroupTheory/library/Harper78a.pdf ,

a year later or so from my own write up. What he does in this pretty paper
is to explain how Hamilton (who would have guessed...) used quaternions to
to extend the discrete Fourier transform I developed for you in the course
for a 1-d circle to the 2-d sphere embedded in 3 dimensions. I do not
expect you to work through this, but it is pretty.



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|		Predrag Cvitanovic'				   |
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