Show that (G_{A B}(t)=G_{B A}(t-i beta hbar)). Use this result to show that, in the classical limit,
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Show that \(G_{A B}(t)=G_{B A}(t-i \beta \hbar)\). Use this result to show that, in the classical limit, \(\hat{\chi}_{A B}^{\prime \prime}(t)\) becomes \(\left\langle\frac{d A(t)}{d t} B(0)\rightangle\). Further show that this leads to equation (15.6.39).
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