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给出三套闭路格林函数之间的变换关系和若干运算规则,同时得到多点推迟和超前格林函数的一般定义。证明多点格林函数之间的一些代数关系,是闭路上相连格林函数生成泛函W[J+,J-](J+=J-=J)=0这一性质的后果。In this article, we derived the transformations among three sets of elosed time path Green's functions and some calculation rules, from which a general definition of arbitrary multipoint retarded and advanced Green's functions follows naturally. Some algebraic identities among multipoint functions have shown to be the consequences of the property W[J+,J-](J+=J-=J)=0 for the generating functional on the closed time path.
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