I am studying how to express Greens functions in imaginary time formalism. I have however big problems understanding the attached derivation. In equation 10.15 and 10.16 in http://www.phys.lsu.edu/~jarrell/CO...hysics Henrik Bruus and Karsten Flensberg.pdf(adsbygoogle = window.adsbygoogle || []).push({});

how do they go from one equation to the other?

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# Time ordering operator

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