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--- classes:2009:fall:phys4101.001:q_a_1202 [2009/12/03 01:33] – olmschenk
+++ classes:2009:fall:phys4101.001:q_a_1202 [2009/12/06 21:49] (current) – ely
@@ Line 10: / Line 10: @@
 ====Captain America 12-02 10:39====
 Can anyone explain how to find the value you want on the Clebsch-Gordon table?  I read the bottom of page 187, but I'm still confused when given a problem how to find out which part of the table to look at (the example is 2 X 1 with the total spin of 3 and the z component 0).  How do you get those four values out of a problem?  Should be easy, but I'm having difficulties with it.
+===Devlin ===
+I'm also having some serious issues with this table.
 ===prest121 12/2 5:50pm===
@@ Line 28: / Line 31: @@
 === The Doctor 12/3 1:31 AM ===
 The variety of divergent trajectories with various Lyapunov exponents makes the problem too difficult for undergraduate courses.  So says wikipedia.
+===Dark Helmet 12/6 21:46===
+My understanding is that it just gets really really complicated because the interaction of body 1 with body 2 changes how they interact with body 3 which then changes again how body 1 and 2 react, etc etc.  However, i think this problem only applies when doing it by hand considering the large number of N body simulations that are being done by computer(dark matter collapse, what-have-you).
 ====Hydra 12/2====
@@ Line 34: / Line 41: @@
 I think equation 4.121: <math>A_lm=\hbar\sqrt{(l+-m)(l-+m+1)}</math>
+====Blackbox 12/3====
+On page 164, the equation between 4.112 and 4.113, why L_L+ becomes zero? Is this the reason that L+*ft is zero?
+===Captain America 12/4 10:57===
+Yes, I believe this is the case.  The <math>L_+</math> operator should act on <math>f_t</math> first, and as equation 4.110 on page 163 points out, it is 0.

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