I have a homework problem whose first part asks for the eigenvectors and eigenspinors of [tex] S_y [/tex]. My problem is following the text to figure out what (mathematically) is [tex] S_y [/tex]. Also, The book first derives S^2, using the following method using [tex] 3/4\hbar^2 [/tex] as the eigenvalue. I was orignally going to follow the books example for S^2 and use the same strategy, however since they didnt explain themselves, I am a little confused. Any help would be appreciated. Thanks.