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Multiple choice
Two Hermitian operators A-hat and B-hat are 'compatible' (simultaneously measurable, sharing a complete basis of simultaneous eigenstates) if and only if which condition holds?
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Their commutator equals i*hbar: [A-hat, B-hat] = i*hbar
Their product is the identity: A-hat*B-hat = 1
Their commutator vanishes: [A-hat, B-hat] = A-hat*B-hat - B-hat*A-hat = 0
They have the same eigenvalues: a_n = b_n for all n
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