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Erratum to: Evolution Law of the Optical Field of Degenerate Parametric Amplifier in Dissipative Channel
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Open AccessA Deduction of the Hellmann-Feynman Theorem
In this paper we present a deduction of the Hellmann-Feynman (HF) theorem for the lowest eigenenergy E0λ\(E_{0}\left (\lambda \right ) \) of a Hamiltonian Hλ\( H\left (\lambda \right ) \), that is : its second-order ...