Abstract
The purpose of this paper is to show that the iterative scheme recently studied by Xu (J Glob Optim 36(1):115---125, 2006) is the same as the one studied by Kamimura and Takahashi (J Approx Theory 106(2):226---240, 2000) and to give a supplement to these results. With the new technique proposed by Mainge (Comput Math Appl 59(1):74---79, 2010), we show that the convergence of the iterative scheme is established under another assumption. It is noted that if the computation error is zero or the approximate computation is exact, our new result is a genuine generalization of Xu's result and Kamimura---Takahashi's result.
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