由函数元构成系统的概率描述的两种方法及相互关系

研究由函数元构成系统的可靠性时，广泛应用着两种对系统的概率描述方法，本文给出了这中方法的明确定义，研究了它们之间的相互转换关系，并证明了涉及转换的两个定理。定理１阐明了从第一种方法向第二种方法转换的唯一性，而了而了从第二种方法向第一种方法转换的非唯一性，本文的结果为这两种方法在今后研究工作中的运用建立了一定的理论基础。

THE TWO MANNERS PROBABILITY DESCRIBING SYSTEM CONSISTING OF FUNCTIONAL ELEMENTS AND STUDY OF THE INTERDEPENDENCE

In the research field of the reliability,the two manners probability describing system consisting of functional elements are widely used.In this paper,we give the explicit definition of the two manners and carefully analyze the transition between the two manners.Two theorems about the transitions are presented.The uniqueness of transition from the first manner to the second manner is illustrated by the theorem 1.The theorem 2 and an example show the inuniqueness of transition from the second manner to the first manner.The present research work is very important to the reliability research.