$$where generator $\mathcal{L}^a$ replaces directional derivative $\nabla V^\top f$, incorporating curvature term $\tfrac{1}{2}\mathrm{Tr}(\Sigma\Sigma^\top\nabla^2 V)$ from $W$'s quadratic variation. Remainder unchanged: substitute into dynamic programming, cancel $V(x)$, divide by $h$, and take $h\downarrow 0$ to obtain (1). $\quad\blacksquare$
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虽然月球确定安全、2024 YR4也被证明并不构成威胁,但行星防御的工作远未结束。 ESA空间安全计划下的行星防御团队仍在持续开展近地天体的探测与轨道监测,希望在未来真正危险目标出现之前,尽早发现并赢得足够的应对时间,确保人类不会在关键时刻措手不及。
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