Upper and lower bounds to critical values of the Hartree operator. [Ritz analogous procedure]
1976
Upper and lower bounds for the minimal critical energy E of the Hartree operator for helium are calculated. It is shown that a Ritz analogous procedure for the calculation of the upper bounds converges to the exact value. The lower bound to E yields that the ground state E/sub H/ of the helium atom is strictly lower than 2E.
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