THE CONVERGENCE OF A MANY-BODY PERTURBATION SERIES FOR AN ATTRACTIVE FERMI-SYSTEM
吸引费米体系多体微扰级数的收敛性

The problem of the convergence for Wigner and Schr?dinger perturbation series is discussed by means of the functional analysis method. It is found that the convergent radii of two typic perturbation series are equivalent, but the rates of the convergence or divergence are not equivalent. An useful test is given.