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→冗余信息计算方法
+\Pi_{\mathbf{R}}(S;\{1\}\{2\})\end{equation}
+\Pi_{\mathbf{R}}(S;\{1\}\{2\})\end{equation}
\begin{equation}
\begin{equation}
(S;R_{1},R_{2}})
I(S;R_{1},R_{2}})
=\Pi_{\mathbf{R}}(S;\{1\})
=\Pi_{\mathbf{R}}(S;\{1\})
+\Pi_{\mathbf{R}}(S;\{2\})
+\Pi_{\mathbf{R}}(S;\{2\})