Abstract
We discuss the Hellmann–Feynman theorem for degenerate states and its application to the calculation of the derivatives of statistical averages with respect to external parameters.
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Fernández, F.M. The Hellmann–Feynman theorem for statistical averages. J Math Chem 52, 2128–2132 (2014). https://doi.org/10.1007/s10910-014-0368-3
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DOI: https://doi.org/10.1007/s10910-014-0368-3