I really with spin quantum number.

Sunny09
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Hello. I am in class eleventh. I met a class 12th guy telling me that he knew a theoretical proof for showing that the values of spin quantum number are +1/2 and -1/2.
If anyone else knows the proof, please tell me...I'm desperate to know..
Any help would be appreciated.
 
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The spin of a particle can be \pm \frac{n}{2} where n is an integer. This is a long algebraic/physical proof. Does he really know what he is talking about?
 
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