From be3b6db203dce2de99ea8c95bddde8b9a0501c5b Mon Sep 17 00:00:00 2001 From: qiwang067 Date: Sun, 8 Aug 2021 15:04:01 +0800 Subject: [PATCH] fix ch2 --- docs/chapter2/chapter2.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/docs/chapter2/chapter2.md b/docs/chapter2/chapter2.md index cff39c1..8295ada 100644 --- a/docs/chapter2/chapter2.md +++ b/docs/chapter2/chapter2.md @@ -179,7 +179,7 @@ $$ > \mathrm{E}(X \mid Y=y)=\sum_{x} x P(X=x \mid Y=y) > $$ -令 $s_t=s$，我们对上述表达式求期望可得： +令 $s_t=s$，我们对 $\mathbb{E}\left[G_{t+1} \mid s_{t+1}\right]$ 求期望可得： $$ \begin{aligned} \mathbb{E}\left[\mathbb{E}\left[G_{t+1} \mid s_{t+1}\right] \mid s_{t}\right]