Note on the perturbation theory of elect
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Werner Kutzelnigg
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Article
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1975
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Elsevier Science
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English
β 299 KB
The n-electron Hilbeert space is pnrtitioned into three ports by means of the projection operators P, Q, R such that P is associated with the known zeroth order wavefunction @, Q with the subspace of iunctions that are singly or doubly substituted wirh respacr to Q and R with the rest. The perturbnt