Abstract
The solution of the dynamic equation is strongly degenerate for systems with an infinite number of degrees of freedom. A causality principle is stated, whereby the particular solution of the dynamic equation, which is at the same time a solution of the kinetic equation, can be selected. The principle is applied here to the multitime formalism of correlation functions. A basis is thus obtained for the method of Green's time-temperature functions in the theory of kinetic equations.
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The author thanks all those who have discussed the topics in this paper with him, particularly V. L. Bonch-Bruevich, D.A. Kirzhnits, V.M. Fain, E.S. Fradkin, and A. S. Shekhter.
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Smolyanskii, S.A. Method of Green's functions in the theory of quantum kinetic equations. I. Soviet Physics Journal 10, 68–70 (1967). https://doi.org/10.1007/BF00820305
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DOI: https://doi.org/10.1007/BF00820305