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\documentstyle[12pt]{article}
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\begin{document}
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\[ \Delta_0^1 A = \sum_{i=0}^{n-1} \Delta_{\lambda_i}^{\lambda_{i+1}} A =
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- kT \sum_{i=0}^{n-1} \ln \left< \exp \left( - \frac{U(\lambda_{i+1}) -
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U(\lambda_i)}{kT} \right) \right>_{\lambda_i} \]
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\end{document}
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