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Have the correlation functions of the XY spin chain model been calculated using a functional partition function with source terms?
Have the correlation functions of the XY spin chain model,
\begin{equation}
H=-\sum_l (J_x \sigma_l^x \sigma_{l+1}^x+J_x \sigma_l^y \sigma_{l+1}^y)-B\sum_l \sigma_l^z
\end{equation}
been calculated ...
