多维随机大与SNBU多维寿命分布类

MULTIVARIATE STOCHASTIC ORDER AND SNBU CLASS OF LIFE DISTRIBUTION

本文从多维随机序──随机大入手，定义了多维寿命分布类ＳＮＢＵ，证明了该定义与文［１］中的定义等价，研究了其部分性质。

Starting with multivariate stochastic order the SNBU class of life distribution is defined. and the equality of this definition with that in ref.[1] is proved. Furthmore, part of the properties of SNBU are studied.