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第96行： − + − + − 它也用于定义交互信息：+ − +
→Relations to other entropy measures 与其他熵测度的关系
:<math>\Eta(X|Y) = \Eta(X,Y) - \Eta(Y)\,</math>,
:<math>H(X|Y) = H(X,Y) - H(Y)\,</math>,
and <math display="block">\Eta(X_1,\dots,X_n) = \sum_{k=1}^n \Eta(X_k|X_{k-1},\dots, X_1)</math>
and <math display="block">H(X_1,\dots,X_n) = \sum_{k=1}^n H(X_k|X_{k-1},\dots, X_1)</math>
It is also used in the definition of [[mutual information]]<ref name=cover1991 />{{rp|21}}
It is also used in the definition of [[mutual information]]<ref name=cover1991 />{{rp|21}}
它也用于定义'''<font color="#ff8000"> 交互信息Mutual information</font>'''：
:<math>\operatorname{I}(X;Y) = \Eta(X) + \Eta(Y) - \Eta(X,Y)\,</math>
:<math>\operatorname{I}(X;Y) = H(X) + H(Y) - H(X,Y)\,</math>