Show that (G_{A B}(t)=G_{B A}(t-i beta hbar)). Use this result to show that, in the classical limit,

Question:

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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