fix ch2
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@@ -179,7 +179,7 @@ $$
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> \mathrm{E}(X \mid Y=y)=\sum_{x} x P(X=x \mid Y=y)
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> $$
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令 $s_t=s$,我们对上述表达式求期望可得:
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令 $s_t=s$,我们对 $\mathbb{E}\left[G_{t+1} \mid s_{t+1}\right]$ 求期望可得:
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$$
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\begin{aligned}
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\mathbb{E}\left[\mathbb{E}\left[G_{t+1} \mid s_{t+1}\right] \mid s_{t}\right]
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