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本文目的是指明,无规与高阶无规位相近似法(以下简称RPA及HRPA)也可由一变分法推得,由此可使我们能更清楚地了解RPA及HRPA的久期方程不具有厄密性的原因,此外变分法还自然地指出了一个使相应的久期方程会具有厄密性的途径以及一个确定粒子填充数的方法。It is shown that the RP-HRP (random phase and higher random phase) approximation may be derived by a variational method. The reason why the secular equation of the RP-HRP approximation is nonhermitian is then made clear and a procedure which can lead it to be hermitian is suggested. It is further pointed out that the variation principle may also serve as a method to determine the average occupation numbers nr=0|fr-1∑μξrμ+ξrμ|Ψ0>.
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