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Three-Point Functions in

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TLDR
In this paper, the authors consider the calculations of three-point functions at night temperature and show that the Imaginary-Time and Real Time temperature formalisms calculate expectation values of retarded and time ordered three point functions respectively.
Abstract
We consider the calculations of three-point functions at nite temperature as they are usually performed in the literature. We show that as normally used, the Imaginary-Time and the Real Time nite temperature formalisms calculate expectation values of retarded and time ordered three point functions respectively. We also present a relation between these quantities that shows that they are not generally equal. In the past in nite temperature eld theory, attention has focused largely on two-point functions 1, 2]. Recently there has been increasing interest in

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References
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