In this paper, a new convergence theorem and error estimates for two types of generalized method are obtained by means of cubic major function, under the unified determination.

该文在统一判定条件下，借助于三次优函数，给出了两类一般迭代法的不同于以前的收敛性和误差估。

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Then we give the convergence and error estimates for two types of generalized iterations by means of cubic majorizing function in chapter four.

第四章也利用三次优函数得到了两类一般迭代法的收敛性和误差估计。

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