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→尺度闭合 与 成块性
& = \sum_{l = t+1}^{t+L} \left ( H(Z_l | Z_{l-1}) - H(Z_l | \overrightarrow{Z_{t+1}}, X_t) \right ) \\
& = \sum_{l = t+1}^{t+L} \left ( H(Z_l | Z_{l-1}) - H(Z_l | \overrightarrow{Z_{t+1}}, X_t) \right ) \\
&\leq = \sum_{l = t+1}^{t+L} \left ( H(Z_l | Z_{l-1}) - H(Z_l | \overrightarrow{Z_{t+1}}, X_t) \right ) \\
&\leq = \sum_{l = t+1}^{t+L} \left ( H(Z_l | Z_{l-1}) - H(Z_l | \overrightarrow{Z_{t+1}}, X_t) \right ) \\
= 0
&= 0
\end{aligned}
\end{aligned}
</math>
</math>