Closed shells - unrestricted Hartree-Fock UHF

This subject will be treated in a later chapter on continuum states and scattering theory. 

Because of antisymmetry, variations of that are simply Unear transformations of occupied orbitals have no effect other than a change of normalization. For orbital functions with fixed normalization, a general variation of takes the form = Hi ni Ha( 1 — na) fScf. The variational condition is 

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