为了建立相对论经典统计力学，分布函数的规格化条件必须明确定义。
The normalization condition of a distribution function should be defined explicitly for establishing relativistic statistical mechanics.
通过规格化条件讨论，分析了统计分布函数与四维粒子流矢量间的关系。
The relations between particle four current vector, normalization condition and distribution function are analysed.
非参数ACD模型不依赖条件均值的函数形式和误差项的分布形式，更具有一般意义。
Because the nonparametric ACD model does not rely on the functional form of (conditional) mean value and the error distribution form, it has more typical implication.
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