【摘要】 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。更多还原

【Abstract】 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.更多还原