154 约束类公式
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1. 规矩公式
\mathcal D\star\mathcal R=0
一句话：东西不会凭空消失，总量守恒，不能乱来。
- 能量守恒
- 电荷守恒
- 动量守恒
- 麦克斯韦里的无源场方程
- 高斯定理
- Bianchi 恒等式