并证明了如下结论：用这个方法得出的近似解，当阶梯数趋于无穷时趋于真解。
The following result is proved. The approximate solution by this method approaches the true solution if the number of the steps approaches the infinity.
该方法用于近似业务量的无穷可分层叠模型。
The method can approximate the infinitely divisible cascades model of traffic.
远场边界条件由无穷远处的条件近似代替。
The boundary condition at farfield is approximated by that at infinite.
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