On the Hellmann-Feynman theorem in statistical mechanics

preprint2020arXivOpen access

Abstract

In this paper we develop the Hellmann-Feynman theorem in statistical mechanics without resorting to the eigenvalues and eigenvectors of the Hamiltonian operator. Present approach does not require the quantum-mechanical version of the theorem at T=0T=0 and bypasses any discussion about degenerate states.

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