Browder-Petryshyn型严格伪压缩映象复合迭代算法的收敛性

<正>1引言设E是实Banach空间,E*为E的对偶空间,〈·,·〉表示E与E*之间的广义对偶对.正规对偶映象J:E→2~(E*)定义为J(x)={f∈E*:〈x,f〉=‖x‖~2=‖f‖~2},x∈E.用j表示J中的单值映象.用F(T)表示映象T的不动点集.定义1.1设E是实Banach空间,K是E的非空凸子集,T:K→K是一个映象,则称T是Lipschitz的,若存在L0,使得,x,y∈K,有‖Tx-Ty‖≤L‖x-y‖.称     

Banach空间中一类广义Lipschitz非线性算子迭代序列的收敛定理

1　引言与预备知识设 X为一实 Banach空间 ,X*是 X的对偶空间 ,正规对偶映射 J:X→ 2 X*定义为 :J( x) ={ f∈ X*;〈x,f〉 =‖ f‖ .‖ x‖ ,‖ f‖ =‖ x‖ }其中〈· ,·〉表示 X和 X*的广义对偶组 .用 j(· )表示单值的正规对偶映射 .设 K是 X的一非空子集 ,算子 T:K→ X称为φ-强增生的[1 ,2 ] ,如果存在一个严格增加函数φ:[0 ,+∞ )→ [0 ,+∞ ) ,φ( 0 ) =0满足 x,y∈ K, j( x-y)∈ J( x-y)使得〈Tx -Ty,j( x -y)〉≥φ(‖ x -y‖ ) .‖ x -y‖ ( 1 )( 1 )中若 φ( t) =kt(其中 k>0 ) ,相应地称 T为强增生算子 ,k称为 T的…     

一致光滑Banach空间中Φ-半压缩映象的不动点的迭代逼近

1　引言与预备知识设X为实Banach空间,X*为其共轭空间.正规对偶映象J:X→2X*定义为:Jx={x*∈X*:〈x,x*〉=‖x‖2=‖x*‖2},其中〈·,·〉表示广义对偶组.熟知,若X*为严格凸的,则J为单值正齐次的;若X*为一致凸的(等价地,X为一致光滑的),则J在X的任何有界子集上是一致连续的.我们用j表示单值的正规对偶映象.用R+表示正半实轴.以F(T)表示T的不动点集,即F(T)={x∈D(T):Tx=x}.映象T:D(T)X→X称为φ-半压缩的,如果F(T)≠,且存在严格增加函数φ:R+→R+,φ(0)=0,使得x∈D(T),y∈F(T),相应地存在某j(x-y)∈J(x-y)满足不等式〈Tx-y,j(…     

ON CONVERGENCE OF ISHIKA WAITERATION PROCEDURES WITH ERRORS

1　IntroductionLet X be a real Banach space and let Jdenotethe normalized duality mapping from X into2 X* given byJ( x) ={ f*∈ X* :〈x,f*〉 =‖ x‖ 2 ,　　‖ f*‖ =‖ x‖ } ,where X* is the dual and〈· ,·〉denotes the generalized duality pairing.Clearly,X issmooth if and only if J is a single-valued mapping.An operator T with domain D( T) =K and range R( T) in X iscalled strongly accretive ifthere exists a constant k>0 and for all x,y∈D( T) ,there exists j( x-y)∈ J( x-y) suchthat…     

利用导数求参变量范围题的错题分析

<正>题目设函数f（x）=-a（x²+1）^1/2+x+ a,x∈（0,1）a∈R⁺.若f（x）在（0,1）上是增函数,求a的取值范围.错解f′（x）=（-ax）/（x²+1）^1/2+1,∵f（x）在（0,1）上是增函数,∴在x∈（0,1）上有f′（x）>0,     

A Universal Inequality for Stability of Coarse Lipschitz Embeddings

Let X and Y be two pointed metric spaces.In this article,we give a generalization of the Cheng-Dong-Zhang theorem for coarse Lipschitz embeddings as follows:If f:X→Y is a standard coarse Lipschitz embedding,then for each x^*∈Lip₀(X) there exist α,γ> 0 depending only on f and Q_x*G Lip₀(Y) with ‖Q_x*‖_Lip ≤α‖x^*‖_Lip such that ■,for all x∈X.Coarse stability for a pair of metric spaces is studied.This can be consi...     

A multidimensional central limit theorem with speed of convergence for axiom a diffeomorphisms

Let T:X → X be an Axiom A diffeomorphism,m the Gibbs state for a Hlder continuous function ɡ. Assume that f:X → R^d is a Hlder continuous function with ∫_X^fdm = 0.If the components of f are cohomologously independent, then there exists a positive definite symmetric matrix σ²:=σ² （f ） such that S^fn √ n converges in distribution with respect to m to a Gaussian random variable with expectation 0 and covariance matrix σ² . Moreover, there exists a real number A > 0 such that, for any integer n ≥ 1,Π( m*（ 1√ nS f n ）,N （0,σ² ） ≤A√n, where m*（1√ n S^fn）denotes the distribution of 1√ n S^fn with respect to m, and Π is the Prokhorov metric.     

Lp空间Kantorovich-Vertesi算子逼近的Jackson型估计

考虑了Kantorovich-Vertesi有理插值型算子L^*n,s（f,X,x）对L^p[-1,1]（1≤p≤∞）空间函数逼近的Jackson型估计。并获得了如下逼近阶：‖L^*n,s(f,X,x)-f(x)‖L^p[-1,1]≤Cp,sw(f,1/n 2)L^p[-1,1] （s＞2）。     

对一道浙江高考调测题的解法探究及推广

试题:如图1,椭圆C:x²+3y²=3b²（b>0）.（I）求椭圆C的离心率;（Ⅱ）若b=1,A,B是椭圆C上两点,且|AB|=3^1/2,求△AOB面积的最大值.解法一:（I）由x²+3y²=3b²得x²/（3b²）+y²/b²,所以e=c/a=(（3b²-b²）^1/2)/(（3b²）^1/2)（Ⅱ）设A（x₁,y₁）,B（x₂,y₂）,△ABO的面积为S.如果AB⊥x轴,由对称性不妨记A的坐标为(3^1/2/2,3^1/2/2),此时S=1/2·3^1/2/2·3^1/2=3/4;如果AB不垂直于x轴,设直线AB的方程为y=kx     

再谈不动点在数列通项公式求解中的作用

<正>贵刊文[1]利用函数f（x）的"不动点"巧妙地求出了形如a_n=(a·a_n-1+b)/(c·a_n-1+d)（a,b,c,d均不为零且（d-a）⁺4dc≥0）,及a_n=(a·a_n-1²+b)/(2a·a_n-1+c) （a,b,c均不为零且c²+4ad>0）的数列通项公式,读后深受启发.经过研究,本人发现利用函数f（x）的"不动点"还可求出如下一种形式的数列通项公式:     

Stability results for Jungck-type iterative processes in convex metric spaces

In this paper, we obtain some stability results in complete convex metric spaces for nonselfmappings satisfying certain general contractivity condition. We prove our results for Jungck-Mann and Jungck-Ishikawa iterations. Our results extend several stability results in the literature.     

Coupled common fixed point theorems for w-compatible mappings in ordered cone metric spaces

We establish coupled coincidence point results for mixed g-monotone mappings under general contractive conditions in partially ordered cone metric spaces over solid cones. We also present results on existence and uniqueness of coupled common fixed points. Our results generalize, extend and unify several well known comparable results in the literature. To illustrate our results and to distinguish them from the earlier ones, we equip the paper with examples.     

锥度量空间中c-距离下的不动点定理

在锥度量空间中,用压缩性函数代替具体实数,获得了c-距离下的映射的新的不动点定理.所得结果在条件上不要求映射的非减性,且第一个定理去掉了锥的正规性,第二个定理去掉了映射的连续性,改进了原有的许多重要结论,并给出了相应的例子.     

Positive curvature,symmetry, and topology

We depict recent developments in the field of positive sectional curvature, mainly, but not exclusively, under the assumption of isometric torus actions. After an elaborate introduction to the field, we shall discuss various classification results, before we provide results on the computation of Euler characteristics. This will be the starting point for an examination of more involved invariants and further techniques. In particular, we shall discuss the Hopf conjectures, related decomposition results like the Wilhelm conjecture, results in differential topology and index theory as well as in rational homotopy theory, geometrically formal metrics in positive curvature and much more. The results we present will be discussed for arbitrary dimensions, but also specified to small dimensions. This survey article features mainly depictions of our own work interest in this area and cites results obtained in different collaborations; full statements and proofs can be found in the respective original research articles.     

Properties of serial kanban systems

In this paper we show some structural results of a kanban system by using results about the underlying GSMP. The main results from this connection are: dominance of allocations, optimal partition, upper and lower bounds on throughput, consistency of the IPA derivative, convexity of throughput as a function of service time parameters and concavity of throughput with respect to number of kanbans. Although the dominance and the partition results were obtained previously by sample path arguments, the proofs here are less cumbersome and generalize the earlier results. The second-order properties for kanban lines are new. These results form a basis for results in multi-product lines where proofs by sample paths require extensive notation.     

New type of fixed point result of F-contraction with applications

The purpose of this paper is to prove theorem which generalize the corresponding results of Rhoades [B. E. Rhoades, Two New Fixed Point Theorems, Gen. Math. Notes, 2015, 27(2), 123--132]. This paper is to introduce the notion of dynamic process for generalized $F-$contraction mappings and to obtain coincidence and common fixed point results for such process. It is worth mentioning that our results do not rely on the commonly used range inclusion condition. We provide some examples to support our results. As an application of our results, we obtain the existence and uniqueness of solutions of dynamic programming and integral equations. Our results provide extension as well as substantial generalizations and improvements of several well known results in the existing comparable literature.     

Some results on multi-valued weakly jungck mappings in <Emphasis Type="Italic">b</Emphasis>-metric space

In this paper, the concept of multi-valued weak contraction of Berinde and Berinde [8] for the Picard iteration in a complete metric space is extended to the case of multi-valued weak contraction for the Jungck iteration in a complete b-metric space. While our main results generalize the recent results of Berinde and Berinde [8], they also extend, improve and unify several classical results pertainning to single and multi-valued contractive mappings in the fixed point theory. Our results also improve the recent results of Daffer and Kaneko [16].      

偏序集的零调性与可缩性

本文将给出偏序集零调与可缩的几个充分条件，它们包含和深化了文［１］和［２］中的一些结果，把［２］中的一些结果推广到无限偏序集的情形．     

Stability of the generalized quadratic and quartic type functional equation in non-Archimedean fuzzy normed spaces

In this paper, we prove some stability results concerning the generalized quadratic and quartic type functional equation in the context of non-Archimedean fuzzy normed spaces in the spirit of Hyers-Ulam-Rassias. As applications, we establish some results of approximately generalized quadratic and quartic type mapping in non-Archimedean normed spaces. Also, we show that the assumption of the non-Archimedean absolute value of $2$ is less than $1$ cannot be omitted in our corollaries. The results improve and extend some recent results.     

Effective bandwidths: Call admission,traffic policing and filtering for ATM networks

In this paper we review and extend the effective bandwidth results of Kelly [28], and Kesidis, Walrand and Chang [29, 6]. These results provide a framework for call admission schemes which are sensitive to constraints on the mean delay or the tail distribution of the workload in buffered queues. We present results which are valid for a wide variety of traffic streams and discuss their applicability for traffic management in ATM networks. We discuss the impact of traffic policing schemes, such as thresholding and filtering, on the effective bandwidth of sources. Finally we discuss effective bandwidth results for Brownian traffic models for which explicit results reveal the interaction arising in finite buffers.