Hellmann–Feynman theorem
Hellmann–Feynman theorem
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What Wikipedia says
In quantum mechanics, the Hellmann–Feynman theorem relates the derivative of the total energy with respect to a parameter to the expectation value of the derivative of the Hamiltonian with respect to that same parameter.
Excerpt from the Wikipedia article “Hellmann–Feynman theorem”, under the CC BY-SA 4.0 license. Read the article on Wikipedia
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