Problem set No. 4 was posted on Friday October 20, 2017. It is due on Friday November 3, 3017 at 5:00 pm.
I have reposted HW set 4 to correct for misprints: one was in problem 1 question 2 (in the definition of alpha) , another in problem 1 question 4 (in the first line it should say "n=0 and m\geq 0", and it should have been the state with m=+1 instead of -1, and on 1.5 (2nd to last line) the states should be |0,0> and |0,1>), and problem 2 question 4 (in the expectation value of J the last term should be cos beta instead of cos gamma). Please see the edited text of the homework set.

The solutions to Problem set No.4 were posted on November 13, 2017.