tailieunhanh - Báo cáo hóa học: " PICARD ITERATION CONVERGES FASTER THAN MANN ITERATION FOR A CLASS OF QUASI-CONTRACTIVE OPERATORS"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: PICARD ITERATION CONVERGES FASTER THAN MANN ITERATION FOR A CLASS OF QUASI-CONTRACTIVE OPERATORS | PICARD ITERATION CONVERGES FASTER THAN MANN ITERATION FOR A CLASS OF QUASI-CONTRACTIVE OPERATORS VASILE BERINDE Received 20 November 2003 and in revised form 6 February 2004 In the class of quasi-contractive operators satisfying Zamfirescu s conditions the most used fixed point iterative methods that is the Picard Mann and Ishikawa iterations are all known to be convergent to the unique fixed point. In this paper the comparison of the first two methods with respect to their convergence rate is obtained. 1. Introduction In the last three decades many papers have been published on the iterative approximation of fixed points for certain classes of operators using the Mann and Ishikawa iteration methods see 4 for a recent survey. These papers were motivated by the fact that under weaker contractive type conditions the Picard iteration or the method of successive approximations need not converge to the fixed point of the operator in question. However there exist large classes of operators as for example that of quasi-contractive type operators introduced in 4 7 10 11 for which not only the Picard iteration but also the Mann and Ishikawa iterations can be used to approximate the fixed points. In such situations it is of theoretical and practical importance to compare these methods in order to establish if possible which one converges faster. As far as we know there are only a few papers devoted to this very important numerical problem the one due to Rhoades 11 in which the Mann and Ishikawa iterations are compared for the class of continuous and nondecreasing functions f 0 1 0 1 and also the author s papers 1 3 5 concerning the Picard and Krasnoselskij iterative procedures in the class of Lipschitzian and generalized pseudocontractive operators. An empirical comparison of Newton Mann and Ishikawa iterations over two families of decreasing functions was also reported in 13 . In 4 some conclusions of an empirical numerical study of Krasnoselskij Mann and Ishikawa .

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