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→马尔科夫链的简化
<math>
<math>
\begin{aligned}
\begin{aligned}
p_{s_k \rightarrow A_j} = \sum_{s_m \in A_j} p_{s_k \rightarrow s_m} = p_{A_i \rightarrow A_j}, \all s_k \in A_i
p_{s_k \rightarrow A_j} = \sum_{s_m \in A_j} p_{s_k \rightarrow s_m} = p_{A_i \rightarrow A_j}, \forall s_k \in A_i
\end{aligned}
\end{aligned}
</math>
</math>