I have attached a link to the solution set of some questions from sakurai. But I dont understand clearly the solution of question number 5.29.
link: http://www.people.virginia.edu/~7Erdb2k/homework/phys752/quantum.pdf" [Broken]
how did they found the 4x4 matrix from the spin product, how did they get the complete spectrum etc. etc. it would very helpful, if someone would explain it. It is so much urgent.
The Attempt at a Solution
I need a explained solution. It is urgent
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