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Openai/69174844-9774-8012-8b69-32262ca5e35a
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==== 1. 自选自由度 = 内部状态的维度 - 对于每个动量 ppp,内部状态不能被动量变化改变 → 就是小群作用的自由度。 ==== # 小群就是“动量不动时还能做什么旋转或变换” - 有质量 → 可以做三维旋转 → 2s+1 个投影 - 无质量 → 只能做沿动量的旋转 → ±s 的螺旋度
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