【锚点：理论同一性不是「方程长得一样」，而是「模型范畴等价」。】 一个反直觉的事实：牛顿引力有两种写法，看起来是两个理论，但被论证为同一个理论。 【显式】写法 A（力场版）：引力是力。质量密度 ρ 产生引力势 φ，满足泊松方程 ∇²φ = 4πGρ。粒子受力 F = -m∇φ，沿牛顿第二定律运动。 【显式】写法 B（几何版，Newton–Cartan /…
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