Hellmann-Feynman, virial, and scaling re
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Levy, Mel; Perdew, John P.
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Article
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1985
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The American Physical Society
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English
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By the Hellmann-Feynman theorem, the density n (r) of many electrons in the presence of exter- nal potential U(r) obeys the relationships d r n(r)Vv(r)=0 and d r n(r)r)&VU(r)=0. By the virial theorem, the interacting kinetic and electron-electron repulsion expectation values obey 2T[n]+ V"[n] = -f d