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Multiple choice
For a spin-1/2 system,
S
2
=
S
x
2
+
S
y
2
+
S
z
2
S^2 = S_x^2 + S_y^2 + S_z^2
S
2
=
S
x
2
+
S
y
2
+
S
z
2
. What is the value of the commutator
[
S
2
,
S
z
]
[S^2, S_z]
[
S
2
,
S
z
]
(reported as the total magnitude of its matrix entries)?
2
0
1
1/2
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