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An Approach for Solving Split Common Fixed Point Problems with Multiple Output Sets That Uses Dynamic Step Sizes 一种使用动态步长求解多输出集分裂公共不动点问题的方法
4区 数学 Q2 MATHEMATICS, APPLIED Pub Date : 2023-11-10 DOI: 10.1080/01630563.2023.2278836
Huanhuan Cui
AbstractIn this paper, we investigate the split common fixed point problem with multiple output sets and develop novel approaches for effectively approximating its solution. We establish two convergence theorems under appropriate conditions for strictly pseudo-contractive mappings and demicontractive mappings, respectively, which cover some existing results as a special case. Furthermore, the numerical experiments demonstrate that we have developed a competitive method for solving the split common fixed point problem with multiple output sets.KEYWORDS: Demiclosedness principledemicontractive mapsplit common fixed point problemstrictly pseudo-contractive mapMATHEMATICS SUBJECT CLASSIFICATION: 47J2547H0947H1047J05 AcknowledgmentsWe would like to extend our appreciation to the reviewers for their constructive comments that significantly enhanced the quality of our work.Additional informationFundingThis work is supported by the National Natural Science Foundation of China (No. 12101286, 11971216).
摘要本文研究了具有多输出集的分裂公共不动点问题,并给出了有效逼近其解的新方法。我们分别在适当条件下建立了严格伪压缩映射和半压缩映射的两个收敛定理,它们作为特例覆盖了一些已有的结果。此外,数值实验表明,我们开发了一种求解多输出集分裂公共不动点问题的竞争性方法。关键词:半闭性原理半缩图分割公共不动点问题严格伪缩图数学主题分类:47J2547H0947H1047J05致谢感谢审稿人的建设性意见,这些意见大大提高了我们的工作质量。基金资助:国家自然科学基金项目(12101286,11971216)。
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引用次数: 0
How Averaged is the Composition of Two Linear Projections? 两个线性投影的合成有多平均?
4区 数学 Q2 MATHEMATICS, APPLIED Pub Date : 2023-10-29 DOI: 10.1080/01630563.2023.2270308
Heinz H. Bauschke, Theo Bendit, Walaa M. Moursi
AbstractProjection operators are fundamental algorithmic operators in Analysis and Optimization. It is well known that these operators are firmly nonexpansive; however, their composition is generally only averaged and no longer firmly nonexpansive. In this note, we introduce the modulus of averagedness and provide an exact result for the composition of two linear projection operators. As a consequence, we deduce that the Ogura–Yamada bound for the modulus of the composition is sharp.KEYWORDS: Averaged mappingFriedrichs anglemodulus of averagednessnonexpansive mappingOgura–Yamada boundprojectionMATHEMATICS SUBJECT CLASSIFICATION: Primary: 47H09Secondary: 65K0590C25 AcknowledgmentsThe authors thank the reviewers and the editors for careful reading and constructive comments. We also thank Dr. Andrzej Cegielski for making us aware of his recent work [Citation3] which contains complementary results.Notes1 Usually, one excludes the cases κ = 0 and κ = 1 in the study of averaged operators, but it is very convenient in this paper to allow for this case.2 We assume for convenience throughout the paper that the operators have full domain which is the case in all algorithmic applications we are aware of. One could obviously generalize this notion to allow for operators whose domains are proper subsets of X.Additional informationFundingThe research of the authors was partially supported by Discovery Grants of the Natural Sciences and Engineering Research Council of Canada.
摘要投影算子是分析与优化中的基本算法算子。众所周知,这些算符是绝对非膨胀的;然而,它们的组成通常只是平均的,而不再是稳定的非膨胀性的。在本文中,我们引入了平均模,并给出了两个线性投影算子复合的一个精确结果。因此,我们推导出复合模的Ogura-Yamada界是尖锐的。关键词:平均映射friedrichs角平均模非膨胀映射gogura - yamada边界投影数学学科分类:初级:47h09次级:65K0590C25致谢作者感谢审稿人和编辑的认真阅读和建设性的意见。我们还要感谢Andrzej Cegielski博士使我们了解到他最近的工作,其中包含了互补的结果。注1在研究平均算子时,通常会排除κ = 0和κ = 1的情况,但在本文中考虑到这种情况是非常方便的为了方便起见,我们在本文中假设算子具有完整的域,这在我们所知道的所有算法应用中都是如此。显然,我们可以将这一概念推广到允许算子的域是x的适当子集。附加信息资金本文作者的研究部分得到了加拿大自然科学与工程研究委员会的发现补助金的支持。
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引用次数: 0
An Inertial-Like Algorithm for Solving Common Fixed Point Problems of a Family of Continuous Pseudocontractive Mappings 一类连续伪压缩映射的公共不动点问题的类惯性算法
4区 数学 Q2 MATHEMATICS, APPLIED Pub Date : 2023-10-27 DOI: 10.1080/01630563.2023.2267352
H. H. Gidey, H. Zegeye, O. A. Boikanyo, D. Kagiso, Y. A. Belay
AbstractIn this paper, it is our purpose to introduce an inertial-like algorithm for approximating common fixed points of continuous pseudocontractive mappings in the framework of real Hilbert spaces. We prove strong convergence theorems for the sequence generated by the algorithm under certain conditions on the control sequences. We also provide numerical examples to demonstrate the efficiency of our algorithm.Keywords: Common fixed pointcontinuous mappingHilbert spaceinertial methodpseudocontaractive mappingMATHEMATICS SUBJECT CLASSIFICATION: 46N1047B0247H0547H0947H1047J2547J26 Additional informationFundingYA Belay is grateful for the financial support from Simons Foundation based at Botswana International University of Science and Technology (BIUST).
摘要在实数Hilbert空间框架下,引入一种逼近连续伪压缩映射公共不动点的类惯性算法。在一定条件下,在控制序列上证明了算法生成序列的强收敛性定理。通过数值算例验证了算法的有效性。关键词:公共不固定点连续映射希尔伯特空间惯性方法伪约合映射数学学科分类:46N1047B0247H0547H0947H1047J2547J26附加信息资金来源Belay非常感谢来自博茨瓦纳国际科技大学(BIUST)西蒙斯基金会的资金支持。
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引用次数: 0
Finding the Best Proximity Point of Generalized Multivalued Contractions with Applications 广义多值压缩的最佳接近点的寻找及其应用
4区 数学 Q2 MATHEMATICS, APPLIED Pub Date : 2023-10-18 DOI: 10.1080/01630563.2023.2267294
Deepesh Kumar Patel, Bhupeshwar Patel
AbstractThis paper introduces new kind of algorithms for multivalued non-self mapping to obtain the best proximity point without assuming the continuity of involved mapping. Some non-trivial examples are presented to illustrate the facts. Consequently, an application to finding an optimal approximate solution for the homotopy theory is also discussed.Keywords: Best proximity pointFeng-Liu type F-contractionmultivalued almost F-contractionweak P-property and homotopyMATHEMATICS SUBJECT CLASSIFICATION: 47H1054H2554E50 AcknowledgmentsThe authors would like to thank the editor and reviewers for their valuable comments.
摘要本文介绍了一种新的多值非自映射算法,在不假设映射连续性的情况下获得最佳邻近点。提出了一些重要的例子来说明事实。因此,讨论了在求同伦理论的最优近似解中的一个应用。关键词:最佳邻近点feng - liu型f -收缩多值几乎f -收缩弱p -性质与同伦数学学科分类:47H1054H2554E50致谢作者感谢编辑和审稿人的宝贵意见。
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引用次数: 0
Strong Convergence of Trajectories via Inertial Dynamics Combining Hessian-Driven Damping and Tikhonov Regularization for General Convex Minimizations 结合hessian驱动阻尼和Tikhonov正则化的惯性动力学下轨迹的强收敛
4区 数学 Q2 MATHEMATICS, APPLIED Pub Date : 2023-10-17 DOI: 10.1080/01630563.2023.2262828
Akram Chahid Bagy, Zaki Chbani, Hassan Riahi
AbstractLet H be a real Hilbert space, and f:H→R be a convex twice differentiable function whose solution set argminf is nonempty. We investigate the long time behavior of the trajectories of the vanishing damped dynamical system with Tikhonov regularizing term and Hessian-driven damping x¨(t)+α x˙(t)+δ∇2f(x(t))x˙(t)+β(t)∇f(x(t))+cx(t)=0 where α,c,δ are three positive constants, and the time scale parameter β is a positive nondecreasing function such that limt→+∞β(t)=+∞. Under some assumptions on the parameter β, we will show rapid convergence of values, strong convergence toward the minimum norm element of argminf, and rapid convergence of the gradients toward zero. Note that the Hessian-driven damping significantly reduces the oscillatory aspects, and the time scale parameter β improves the rate of convergences mentioned above. As particular cases of β, we set β(t)=tp ln q(t), for (p,q)∈(R+)2∖{(0,0)}, and β(t)=eγtp, for p∈]0,1[ and γ>0. The manuscript concludes with two numerical examples and comments on their performance.KEYWORDS: Damped dynamical systemfast convergenceHessian-driven dampingHilbert spacestrong convergenceTikhonov regularizationMATHEMATICS SUBJECT CLASSIFICATION: 37N4046N1049M3065K0565K1090B5090C25
摘要设H为实数Hilbert空间,f:H→R为解集arminf非空的凸二次可微函数。我们研究了具有Tikhonov正则化项和hessian驱动阻尼x¨(t)+α x˙(t)+δ∇2f(x(t))x˙(t)+β(t)∇f(x(t))+cx(t)=0的消失阻尼动力系统的长时间行为,其中α、c、δ是三个正常数,时间尺度参数β是一个正的非递减函数,使得极限→+∞β(t)=+∞。在参数β的某些假设下,我们将证明值的快速收敛,向argminf的最小范数元素的强收敛,以及梯度向零的快速收敛。注意,hessian驱动的阻尼显著降低了振荡方面,时间尺度参数β提高了上述收敛速度。作为β的特殊情况下,我们设置β(t) = tp ln q (t)为(p, q)∈(R +) 2∖{(0,0)},和β(t) = eγtp, p∈]0,1和γ> 0。文章最后给出了两个数值例子,并对它们的性能进行了评价。关键词:阻尼动力系统快速收敛;hessia驱动阻尼;hilbert空间;强收敛
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引用次数: 0
On Proximal Algorithms with Inertial Effects Beyond Monotonicity 超越单调性的惯性效应的近端算法
4区 数学 Q2 MATHEMATICS, APPLIED Pub Date : 2023-10-13 DOI: 10.1080/01630563.2023.2266762
Alfredo N. Iusem, R. T. Marcavillaca
AbstractInertial procedures attached to classical methods for solving monotone inclusion and optimization problems, which arise from an implicit discretization of second-order differential equations, have shown a remarkable acceleration effect with respect to these classical algorithms. Among these classical methods, one can mention steepest descent, alternate directions, and the proximal point methods. For the problem of finding zeroes of set-valued operators, the convergence analysis of all existing inertial-proximal methods requires the monotonicity of the operator. We present here a new inertial-proximal point algorithm for finding zeroes of set-valued operators, whose convergence is established for a relevant class of nonmonotone operators, namely the hypomonotone ones.KEYWORDS: Generalized monotone operatorshypomonotone operatorsinertial methodsproximal point methodMATHEMATICS SUBJECT CLASSIFICATION: 90C2590C3047H05
求解二阶微分方程隐式离散化引起的单调包含和优化问题的经典方法所附的积分过程,相对于这些经典算法显示出显著的加速效应。在这些经典方法中,可以提到最陡下降法、交替方向法和近点法。对于集值算子的寻零问题,现有的所有积分逼近方法的收敛性分析都要求算子的单调性。本文提出了一种求集值算子零点的新算法,该算法对一类相关的非单调算子即次单调算子证明了收敛性。关键词:广义单调算子;拟单调算子;正弦方法;近似点法
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引用次数: 0
Mean Inequalities for the Numerical Radius 数值半径的平均不等式
4区 数学 Q2 MATHEMATICS, APPLIED Pub Date : 2023-10-13 DOI: 10.1080/01630563.2023.2265649
Fuad Kittaneh, Hamid Reza Moradi, Mohammad Sababheh
AbstractExtending certain scalar and norm inequalities, we present new inequalities for the numerical radius, which generalize and refine some known results. Applications of the obtained inequalities include a new original proof of the matrix arithmetic-geometric mean inequality and certain extensions of some well-established results from the literature for products of matrices.KEYWORDS: Convex functionnorm inequalitynumerical radiusMATHEMATICS SUBJECT CLASSIFICATION: Primary: 15A60Secondary: 47A1247A30 Authors’ contributionsThe authors have contributed equally to this work.Disclosure statementAll authors declare that they have no conflicts of interest.Additional informationFundingThe authors did not receive any funding to accomplish this work.
摘要通过对某些标量和范数不等式的推广,给出了数值半径的一些新的不等式,推广和改进了一些已知的结果。所得到的不等式的应用包括矩阵算术-几何平均不等式的一个新的原始证明,以及文献中关于矩阵乘积的一些已建立的结果的某些推广。关键词:凸函数,范数不等式,数值半径,数学学科分类:初级:15a60,次级:47A1247A30,作者的贡献作者对这项工作有同等的贡献。声明所有作者声明他们没有利益冲突。作者没有获得任何资金来完成这项工作。
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引用次数: 0
Multivariate Zipper Fractal Functions 多元拉链分形函数
4区 数学 Q2 MATHEMATICS, APPLIED Pub Date : 2023-10-12 DOI: 10.1080/01630563.2023.2265722
D. Kumar, A. K. B. Chand, P. R. Massopust
AbstractA novel approach to zipper fractal interpolation theory for functions of several variables is presented. Multivariate zipper fractal functions are constructed and then perturbed through free choices of base functions, scaling functions, and a binary matrix called signature to obtain their zipper α-fractal versions. In particular, we propose a multivariate Bernstein zipper fractal function and study its coordinate-wise monotonicity which depends on the values of signature. We derive bounds for the graph of a multivariate zipper fractal function by imposing conditions on the scaling factors and the Hölder exponent of the associated germ function and base function. The box dimension result for multivariate Bernstein zipper fractal function is derived. Finally, we study some constrained approximation properties for multivariate zipper Bernstein fractal functions.KEYWORDS: Box dimensionfractal interpolation functionmonotonicitymultivariate Bernstein operatorpositivityzipperMATHEMATICS SUBJECT CLASSIFICATION: 28A8041A6341A0541A2941A3065D05 AcknowledgmentThe authors are thankful to the annonymous reviewers for their constructive suggestions to improve the presentation of the paper.
摘要提出了一种多变量函数的拉链分形插值理论的新方法。构造多元拉链分形函数,并通过自由选择基函数、标度函数和一个称为signature的二元矩阵对其进行扰动,得到它们的拉链α-分形版本。特别地,我们提出了一个多元Bernstein拉链分形函数,并研究了它依赖于签名值的坐标单调性。通过对尺度因子和相关胚芽函数和基函数的Hölder指数施加条件,导出了多元拉链分形函数图的界。导出了多元Bernstein拉链分形函数的箱维结果。最后,研究了多元zippers Bernstein分形函数的约束近似性质。关键词:盒维数分形插值函数单调性多元Bernstein算子正性zipper数学主题分类:28A8041A6341A0541A2941A3065D05致谢感谢匿名审稿人为改进本文的表述提出的建设性建议。
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引用次数: 0
An approach to preserve functions with exponential growth by using modified Lupaş-Kantrovich operators 利用修正lupa<e:1> - kantrovich算子保持指数增长函数的方法
4区 数学 Q2 MATHEMATICS, APPLIED Pub Date : 2023-10-10 DOI: 10.1080/01630563.2023.2263977
Neha Kajla, Naokant Deo
AbstractAs part of this study, we propose a modification of the so-known Lupaş-Kantrovich that preserve exponential function e−x. To support this claim, we estimate the convergence rate of the operators in terms of both the usual and exponential modulus of continuity. Our analysis also includes a global estimate and quantitative Voronovskaya results. Demonstrating the effectiveness of modified operators, we provided a result and supporting graphs.KEYWORDS: Exponential functionsrate of convergenceVoronovoskaya theoremMATHEMATICS SUBJECT CLASSIFICATION: 41A2541A36 Disclosure statementThis work has no conflicts of interest.Additional informationFundingCSIR is funding this research with Reference No:08/133(0021)/2018-EMR-1 for the first author.
摘要作为本研究的一部分,我们提出了对已知的lupa - kantrovich的修正,该修正保留了指数函数e - x。为了支持这一说法,我们估计了算子的收敛速度在通常和指数模的连续性。我们的分析还包括全球估计和定量Voronovskaya结果。为了证明修正算子的有效性,我们给出了一个结果和支持图。关键词:指数函数收敛率evoronovoskaya定理数学学科分类:41A2541A36披露声明本工作无利益冲突。csir资助本研究,第一作者参考文献号:08/133(0021)/2018-EMR-1。
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引用次数: 0
An Analysis on the Existence of Mild Solution and Optimal Control for Semilinear Thermoelastic System 半线性热弹性系统温和解的存在性及最优控制分析
4区 数学 Q2 MATHEMATICS, APPLIED Pub Date : 2023-10-09 DOI: 10.1080/01630563.2023.2266004
Rohit Patel, V. Vijayakumar, Shimpi Singh Jadon, Anurag Shukla
AbstractIn this article, the main objective is the conversation about the optimal control problem of the semilinear thermoelastic system, in which the control term is placed solely in the thermal equation. We discuss the existence and uniqueness of mild solutions by applying the contraction mapping for the considered system. By assuming some conditions specified Lagrange’s problem acknowledges at least one optimal control pair. For proving the main results, we are assuming the Lipschitz condition on the nonlinear term.KEYWORDS: Existencemild solutionoptimal controlsemilinear thermoelastic systemuniquenessMATHEMATICS SUBJECT CLASSIFICATION: 34A0834K3549J15
摘要本文的主要目的是讨论控制项单独放在热方程中的半线性热弹性系统的最优控制问题。利用所考虑的系统的收缩映射,讨论了温和解的存在唯一性。通过假定某些条件,拉格朗日问题承认至少有一个最优控制对。为了证明主要结果,我们在非线性项上假设了Lipschitz条件。关键词:存在温和解最优控制半线性热弹性系统唯一性数学学科分类:34A0834K3549J15
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引用次数: 0
期刊
Numerical Functional Analysis and Optimization
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