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Woit · 2025-10-20
已登记出处中的最早位置:§1.4 · en。
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§1.4 · en · original_transcription · ai-transcription-compared
We thus see that, at least in the case of finite dimensional , the unitary representation of on coming from an action of on our physical system gives us not just unitary matrices , but also corresponding self-adjoint operators on . Lie group actions thus provide us with a class of quantum mechanical observables, with the self-adjointness property of these operators corresponding to the unitarity of the representation on state space. It is a remarkable fact that for many physical systems the class of observables that arise in this way include the ones of most physical interest.