526
个编辑
更改
跳到导航
跳到搜索
第81行：
第81行： − +
→Less than or equal to the sum of individual entropies 小于或等于单个熵的总和
\Bigl\{H\bigl(X_i\bigr) \Bigr\}</math>
\Bigl\{H\bigl(X_i\bigr) \Bigr\}</math>
=== Less than or equal to the sum of individual entropies 小于或等于单个熵的总和===
=== Less than or equal to the sum of individual entropies 低值性/小于或等于单个熵的总和===
The joint entropy of a set of variables is less than or equal to the sum of the individual entropies of the variables in the set. This is an example of [[subadditivity]]. This inequality is an equality if and only if <math>X</math> and <math>Y</math> are [[statistically independent]].<ref name=cover1991 />{{rp|30}}
The joint entropy of a set of variables is less than or equal to the sum of the individual entropies of the variables in the set. This is an example of [[subadditivity]]. This inequality is an equality if and only if <math>X</math> and <math>Y</math> are [[statistically independent]].<ref name=cover1991 />{{rp|30}}