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Openai/69174844-9774-8012-8b69-32262ca5e35a
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==== 1. 四个元 = 四维动量的四个分量 = (能量, 三维动量) ==== # 参考动量是分析小群的标准四维动量向量 # 小群的定义就是保持这四个元不变的洛伦兹变换 : 如果你愿意，我可以画一张 四维动量图 + 小群示意图，把静止粒子和光子的参考动量、对应小群及自由度可视化出来，一眼理解四个元、参考动量、小群和自旋的关系。 你希望我画吗？
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