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本文的目的是指明,倘满壳层外只有一个粒子或只含一个空穴,即使情态存有退化,我们仍可以求得消去了所有含有粒子自能图的项、而且在形式上和满壳层情况完全一样的相连项展开公式。By a new choice of the vacuum state it is shown that the nondegenerate Brueckner-Goldstone linked cluster expansion formula can also be applied to the case where there is one particle outside or one hole inside the closed shell configuration, even though here exists degeneracy.
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