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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.

What makes the 3-body problem –or the n-body problem for n>2– so difficult? I've heard of the issue in modern physics, astro, and quantum, but I've never seen the problem set up or how there would arise a mathematical barrier. I guess I'll look it up or try to set it up myself. I'm sure the problem will present itself quickly.

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