一致光滑Banach空间中渐近伪压缩映象不动点的迭代逼近

本文研究用于逼近一致光滑Banach空间中渐近伪压缩映象不动点的具误差的修改了的Ishikawa 型与Mann型迭代程序的收敛性,改进和发展了文[1]的相应结果及他人的结果.     

一致光滑Banach空间中渐近伪压缩映象不动点的迭代逼近

本文研究用于逼近一致光滑Banach空间中渐近伪压缩映象不动点的具误差的修改了的Ishikawa型与Mann型迭代程序的收敛性,改进和发展了文[1]的相应结果及他人的结果.     

Banach空间迭代序列的收敛性

先对相关基础知识进行了介绍说明,如拟增生类映象和压缩类映象,广义Lipschitz,两种迭代的迭代过程.然后阐述了目前已知相关结果,给出并论证了Mann迭代序列的收敛性.即在一致光滑的实Banach空间中,讨论并研究了带误差的Mann迭代逼近广义Lipschitz广义Φ-半压缩映象不动点的问题,改进和推广了现有的结果.     

一致凸Banach空间非扩张映象带误差的Ishikawa型的三重迭代序列的收敛性

在一致凸Banach空间上,研究了半紧的非扩张压缩映象‖Tx-Ty‖≤‖x-y‖的Ishikawa型的三重迭代序列的收敛性问题,建立并证明了带误差的Ishikawa三重迭代逼近收敛定理,从而独特的推广了Mann和Ishikawa迭代方法,改进和发展了文献[1]-[7]的主要结果.     

一致拟Lipschitzian映象的修改的具误差Ishikawa迭代序列

证明了Banach空间中一致拟Lipschitzian映象T的修改的具误差Ishikawa迭代序列收敛到不动点的充要条件，其中T不要求连续．     

Banach空间中带误差修改的不动点迭代逼近

对Banach空间中一致L-Lipschitz映射带误差修改的Ishikawa迭代序列和带误差的修改的Mann迭代序列强收敛的充要条件进行了研究,所得结果改进和推广了最近文献中的一些相应结果.     

具一致广义Lipschitz连续算子的带误差的多步迭代间的收敛等价性

研究了一致光滑Banach空间中具一致广义Lipschitz连续的逐次渐近Φ-强伪压缩型算子的具误差的修正Mann迭代和具误差的修正多步Noor迭代间的收敛等价性问题,所得结果是对2007年Zhenyu Huang在一致光滑Banach空间中所建立的逼近具有有界值域的逐次Φ-强伪压缩算子的不动点具误差的修正Mann迭代和具误差的修正Ishikawa迭代两者的收敛是等价的这一结论更本质的和更一般的推广,所用的方法不全同于ZhenyuHuang所使用的方法,因此,从更一般的意义上肯定地回答了Rhoades和Soltuz于2003年所提出的猜想.     

渐近非扩展映象的具误差的Ishikawa迭代序列的新强收敛定理

使用新的证明方法，在去掉数列{an}单调递减的条件下，建立了一致凸Banach空间中的渐近非扩展映象不动点的具误差的Ishikawa迭代序列的新强收敛定理．其结果推广和改进了Schu，Rhoades及周海云等作者的相关结果．     

逼近一致凸Banach空间中渐近非扩张映象的不动点

借助于B ruck′s不等式,研究了一致凸Banach空间中渐近非扩张映象不动点的具误差的Ish ikaw a迭代序列的强收敛定理.所得的结果推广和改进了Schu,Rhoades,周海云,王绍荣等作者的相应结果.     

一致光滑Banach空间中Ф-半压缩映射具误差Mann迭代收敛定理的注释

文章在一致光滑Banach空间,获得了广义LipschitzΦ-半压缩映射带误差的Mann迭代收敛定理.该结果改进并拓广了文献[1,7,10-12]中相应的结果.     

非扩张映象对公共不动点的迭代逼近

对非扩张映象对引入了修改的Mann迭代格式，并证明了在一致光滑Banach空间中强收敛到其公共不动点，改进并推广了Tae—Hwa Kim and Hong—Kun Xu在2005年的结果．     

一致凸Banach空间非扩张映象的修正Ishikawa迭代序列的强收敛

在一致凸Banach空间上，研究了半紧的非扩张压缩映象的修正Ishikawasa三重迭代序列的强收敛问题，建立并证明了若干强收敛定理，推广了Mann和Ishikawa的迭代方法，改进和发展了Xu和贾如鹏等作者的主要结果．     

Banach空间中两类压缩映射的迭代逼近

讨论了Banach空间中拟压缩映射和广义压缩映射的具误差的Ishikawa迭代序列的收敛性,得出了在一定条件下,这两类压缩映射分别强收敛于它们的不动点.这些结论推广和发展了已有的相关结果,使这些结果的适用范围更广.     

Strong convergence of approximated sequences for nonexpansive mappings in Banach spaces

This paper studies the convergence of the sequence defined by x0∈C,xn 1=αnu (1-αn)Txn,n=0,1,2,…, where 0 ≤αn ≤ 1, limn→∞αn = 0, ∑∞n=0 αn = ∞, and T is a nonexpansive mapping from a nonempty closed convex subset C of a Banach space X into itself. The iterative sequence {xn} converges strongly to a fixed point of T in the case when X is a uniformly convex Banach space with a uniformly Gateaux differentiable norm or a uniformly smooth Banach space only. The results presented in this paper extend and improve some recent results.     

一致凸的Banach空间上的渐近非扩张映象的迭代序列的收敛性定理

本文把「３」的主要结果从Ｈｉｌｂｅｒｔ空间推广到一致凸的Ｂａｎａｃｈ空间,证明了一致凸的Ｂａｎａｃｈ空间上的渐近非扩张映象的迭代序列的收敛性。     

迭代逼近m-增生映象的零点

设E是具有一致正规结构的实Banach空间,其范数是一致Gateaux可微的.设A是m-增生映象,使得C=■是E的凸子集,数列{α_n)■[0,1],{r_n}■ (0,∞),在适当的条件下,则由(1.2)式定义的迭代序列{x_n}强收敛于A~(-1)(0)中的点.其次证明了:设E是一致凸Banach空间,其范数是Frechet可微的.设数列{α_n},{β_n)■(0,1),{r_n}■(0,∞),满足适当的条件.如果A~(-1)(0)∩B~(-1)(0)≠φ,则由(3.20)式定义的序列{x_n}弱收敛于A~(-1)(0)∩B~(-1)(0)中的点.其结果推广和改进了Kamimura,Takahashi(2000)的定理2及Xu H.K.(2006)的定理4.1,定理4.2和定理4.3:(i)Kamimura,Takahashi(2000)定理2中的假设"自反Banach空间E的每个有界闭凸子集对非扩张自映象有不动点性质"被去掉;(ii)Xu H.K.(2006)的假设"E是具有弱连续对偶映象J_φ的自反Banach空间",被本文的假设"E是具有一致正规结构且其范数是一致Gateaux可微的Banach空间"所取代.从而补充了Xu H.K.(2006)未包含的另外一些Banach空间.同时还证明了逼近两个m-增生映象的公共零点,其结果也推广和改进了Mainge的相应结果.     

集值非扩张映象不动点存在与收敛性

讨论了δ集值非扩张映象在一致凸Banach空间中不动点非空的充分必要条件与Ishikawa迭代序列的收敛性及确保迭代程序收敛到不动点的条件,所得结果是单值非扩张映象情形的推广和发展.     

Weak and Strong Convergence Theorems for Maximal Monotone Operators in a Banach Space

In this paper, we introduce an iterative sequence for finding a solution of a maximal monotone operator in a uniformly convex Banach space. Then we first prove a strong convergence theorem, using the notion of generalized projection. Assuming that the duality mapping is weakly sequentially continuous, we next prove a weak convergence theorem, which extends the previous results of Rockafellar [SIAM J. Control Optim. 14 (1976), 877–898] and Kamimura and Takahashi [J. Approx. Theory 106 (2000), 226–240]. Finally, we apply our convergence theorem to the convex minimization problem and the variational inequality problem.     

Stability of iterative procedures with errors for approximating common fixed points of a couple of q-contractive-like mappings in Banach spaces

Recently, Agarwal, Cho, Li and Huang [R.P. Agarwal, Y.J. Cho, J. Li, N.J. Huang, Stability of iterative procedures with errors approximating common fixed points for a couple of quasi-contractive mappings in q-uniformly smooth Banach spaces, J. Math. Anal. Appl. 272 (2002) 435-447] introduced the new iterative procedures with errors for approximating the common fixed point of a couple of quasi-contractive mappings and showed the stability of these iterative procedures with errors in Banach spaces. In this paper, we introduce a new concept of a couple of q-contractive-like mappings (q>1) in a Banach space and apply these iterative procedures with errors for approximating the common fixed point of the couple of q-contractive-like mappings. The results established in this paper improve, extend and unify the corresponding ones of Agarwal, Cho, Li and Huang [R.P. Agarwal, Y.J. Cho, J. Li, N.J. Huang, Stability of iterative procedures with errors approximating common fixed points for a couple of quasi-contractive mappings in q-uniformly smooth Banach spaces, J. Math. Anal. Appl. 272 (2002) 435-447], Chidume [C.E. Chidume, Approximation of fixed points of quasi-contractive mappings in Lp spaces, Indian J. Pure Appl. Math. 22 (1991) 273-386], Chidume and Osilike [C.E. Chidume, M.O. Osilike, Fixed points iterations for quasi-contractive maps in uniformly smooth Banach spaces, Bull. Korean Math. Soc. 30 (1993) 201-212], Liu [Q.H. Liu, On Naimpally and Singh's open questions, J. Math. Anal. Appl. 124 (1987) 157-164; Q.H. Liu, A convergence theorem of the sequence of Ishikawa iterates for quasi-contractive mappings, J. Math. Anal. Appl. 146 (1990) 301-305], Osilike [M.O. Osilike, A stable iteration procedure for quasi-contractive maps, Indian J. Pure Appl. Math. 27 (1996) 25-34; M.O. Osilike, Stability of the Ishikawa iteration method for quasi-contractive maps, Indian J. Pure Appl. Math. 28 (1997) 1251-1265] and many others in the literature.