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Update ifp.md
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lectures/ifp.md

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@@ -200,13 +200,15 @@ u' (c_t)
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的唯一可行路径。
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此外,存在一个*最优消费函数* $\sigma^* \colon \mathsf S \to \mathbb R_+$,使得从 $(a,z)$ 出发的路径
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$$
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(a_0, z_0) = (a, z),
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\quad
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c_t = \sigma^*(a_t, Z_t)
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\quad \text{和} \quad
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a_{t+1} = R (a_t - c_t) + Y_{t+1}
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$$
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同时满足{eq}`eqeul0`和{eq}`eqtv`,因此是从 $(a,z)$ 出发的唯一最优路径。
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因此,为了解决这个优化问题,我们需要计算策略 $\sigma^*$。

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