(1) In problem 1, I changed the phrasing from "find" the phase portrait to "plot" the phase portrait to make it clearer.

(2) In problem 2c, I made the definition of q-twisted state more explicit, even though it was actually there anyway.

Neither of these typos should have caused any problems.

**Update (2/01/10):**There is an additional typo that might be a bit problematic. In problem 3, omega_1 = omega_3 starting in part (b). I inadvertently forgot to type that and hope that this has not caused any problems. I also found a minor typo in (3), which I have corrected (there is a factor of K missing in the denominator in the definition of rho).

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