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→信息闭合 Information Closure
\begin{aligned}
\begin{aligned}
I(\overrightarrow{Z_t}; \overleftarrow{X_t} | \overleftarrow{Z_t})
I(\overrightarrow{Z_t}; \overleftarrow{X_t} | \overleftarrow{Z_t})
& = I(\overrightarrow{Z_t}, \overleftarrow{X_t} ; \overleftarrow{Z_t}) - I(\overrightarrow{Z_t} ; \overleftarrow{Z_t}) \\
& = I(\overleftarrow{Z_t}, \overleftarrow{X_t} ; \overrightarrow{Z_t}) - I(\overrightarrow{Z_t} ; \overleftarrow{Z_t}) \\
& = I(\overleftarrow{X_t} ; \overleftarrow{Z_t}) - I(\overrightarrow{Z_t} ; \overleftarrow{Z_t}) \\
& = I(\overleftarrow{X_t} ; \overrightarrow{Z_t}) - I(\overrightarrow{Z_t} ; \overleftarrow{Z_t}) \\
& = 0
& = 0
\end{aligned}
\end{aligned}