在闭合时间路径温度场论基础上，导出了直接计算推迟和超前格林函数的一种费曼规则。
Based on the closed time path formalism, a deduced Feynman rule for directly calculating the retarded and advanced Green functions is given.
求解了运动媒质中电磁势方程的格林函数，给出了无界空间的推迟势。
Solving the Greens functions of electromagnetic potential equations in moving medium, the retarded potentials in unlimited space are obtained.
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