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A two-point Newton-like method of optimal fourth order convergence for systems of nonlinear equations 非线性方程系统最优四阶收敛的类似牛顿的两点法
IF 1.8 2区 数学 Q1 MATHEMATICS Pub Date : 2024-11-05 DOI: 10.1016/j.jco.2024.101907
Harmandeep Singh , Janak Raj Sharma
A two-step Newton-like method is proposed to efficiently solve the systems of nonlinear equations. Extending Newton scheme to a next step as weighted-Newton iteration, the proposed iteration scheme shows optimal fourth order of convergence. The primary objective in formulating the method is to keep the computational efficiency as high as possible. In this context, the efficiency analysis is thoroughly examined using a systematic approach, wherein the efficiency index of the new method is compared with those of existing methods of comparable complexity. Numerical experimentation is performed to investigate the computational efficacy of the developed method. Results indicate higher efficiency and numerical precision in comparison to the existing counterparts.
本文提出了一种类似牛顿的两步法来高效求解非线性方程组。所提出的迭代方案将牛顿方案扩展到下一步,即加权牛顿迭代,显示出最佳的第四阶收敛性。制定该方法的首要目标是保持尽可能高的计算效率。在此背景下,我们采用系统方法对效率分析进行了深入研究,并将新方法的效率指数与复杂度相当的现有方法进行了比较。通过数值实验研究了所开发方法的计算效率。结果表明,与现有方法相比,新方法具有更高的效率和数值精度。
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引用次数: 0
Combinatorial constructions of separating codes 分离密码的组合构造
IF 1.8 2区 数学 Q1 MATHEMATICS Pub Date : 2024-10-31 DOI: 10.1016/j.jco.2024.101906
Marcel Fernández , John Livieratos , Sebastià Martín
This paper presents an algorithmic approach to the construction of separating codes. In the first part of the work, the Lovász Local Lemma is used to obtain a lower bound on the code rate. This lower bound matches the previously best-known lower bound. In the second part, it is shown how the technique used in proving the lower bound leads to an algorithm that outputs an instance of a separating code. Moreover, the implications of the algorithm regarding computational complexity are considered. The discussion ends by presenting explicit separating codes with polynomial computational complexity in the length of the code, with rate that improves previously known constructions.
本文提出了一种构建分离码的算法方法。在工作的第一部分,利用 Lovász Local Lemma 获得了码率下限。该下限与之前最著名的下限相吻合。第二部分展示了证明下限时使用的技术如何导致一种算法输出分离代码实例。此外,还考虑了该算法对计算复杂性的影响。讨论的最后,提出了计算复杂度与代码长度成多项式关系的显式分离代码,其速率改进了之前已知的构造。
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引用次数: 0
Matthieu Dolbeault is the winner of the 2024 Joseph F. Traub Information-Based Complexity Young Researcher Award 马蒂厄-多尔贝奥(Matthieu Dolbeault)是 2024 年约瑟夫-特劳布基于信息的复杂性青年研究员奖(Joseph F. Traub Information-Based Complexity Young Researcher Award)的获得者。
IF 1.8 2区 数学 Q1 MATHEMATICS Pub Date : 2024-10-22 DOI: 10.1016/j.jco.2024.101902
Erich Novak, Kateryna Pozharska, Mathias Sonnleitner, Michaela Szölgyenyi, Henryk Woźniakowski
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引用次数: 0
Optimal recovery of linear operators from information of random functions 从随机函数信息中优化恢复线性算子
IF 1.8 2区 数学 Q1 MATHEMATICS Pub Date : 2024-10-21 DOI: 10.1016/j.jco.2024.101903
K.Yu. Osipenko
The paper concerns problems of the recovery of linear operators defined on sets of functions from information of these functions given with stochastic errors. The constructed optimal recovery methods, in general, do not use all the available information. As a consequence, optimal methods are obtained for recovering derivatives of functions from Sobolev classes by the information of their Fourier transforms given with stochastic errors. A similar problem is considered for solutions of the heat equation.
本文涉及从带有随机误差的函数信息中恢复定义在函数集合上的线性算子的问题。一般来说,所构建的最优复原方法并不能利用所有可用信息。因此,利用随机误差给出的函数傅里叶变换信息,可以获得从索博廖夫类中恢复函数导数的最优方法。对于热方程的解,也考虑了类似的问题。
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引用次数: 0
Intractability results for integration in tensor product spaces 张量乘空间积分的难解性结果
IF 1.8 2区 数学 Q1 MATHEMATICS Pub Date : 2024-10-16 DOI: 10.1016/j.jco.2024.101901
Erich Novak , Friedrich Pillichshammer
We prove lower bounds on the worst-case error of numerical integration in tensor product spaces. The information complexity is the minimal number N of function evaluations that is necessary such that the N-th minimal error is less than a factor ε times the initial error, i.e., the error for N=0, where ε belongs to (0,1). We are interested to which extent the information complexity depends on the number d of variables of the integrands. If the information complexity grows exponentially fast in d, then the integration problem is said to suffer from the curse of dimensionality.
Under the assumption of the existence of a worst-case function for the uni-variate problem, we present two methods for providing lower bounds on the information complexity. The first method is based on a suitable decomposition of the worst-case function and can be seen as a generalization of the method of decomposable reproducing kernels. The second method, although only applicable for positive quadrature rules, does not require a suitable decomposition of the worst-case function. Rather, it is based on a spline approximation of the worst-case function and can be used for analytic functions. Several applications of both methods are presented.
我们证明了张量乘空间中数值积分最坏情况误差的下限。信息复杂度是函数求值的最小次数 N,即 N 次最小误差小于初始误差的系数 ε 倍,即 N=0 时的误差,其中 ε 属于 (0,1)。我们感兴趣的是,信息复杂度在多大程度上取决于积分变量的数量 d。如果信息复杂度在 d 的范围内呈指数增长,那么积分问题就会受到维度诅咒的影响。在单变量问题存在最坏情况函数的假设下,我们提出了两种提供信息复杂度下限的方法。第一种方法基于对最坏情况函数的适当分解,可视为可分解再现核方法的一般化。第二种方法虽然只适用于正二次函数规则,但不需要对最坏情况函数进行适当分解。相反,它以最坏情况函数的样条近似为基础,可用于解析函数。本文介绍了这两种方法的几种应用。
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引用次数: 0
Kernel multigrid on manifolds 流形上的核多网格
IF 1.8 2区 数学 Q1 MATHEMATICS Pub Date : 2024-10-09 DOI: 10.1016/j.jco.2024.101900
Thomas Hangelbroek , Christian Rieger
Kernel methods for solving partial differential equations work coordinate-free on the surface and yield high approximation rates for smooth solutions. Localized Lagrange bases have proven to alleviate the computational complexity of usual kernel methods for data fitting problems, but the efficient numerical solution of the ill-conditioned linear systems of equations arising from kernel-based Galerkin solutions to PDEs is a challenging problem which has not been addressed in the literature so far. In this article we apply the framework of the geometric multigrid method with a τ2-cycle to scattered, quasi-uniform point clouds on the surface. We show that the resulting solver can be accelerated by using the Lagrange function decay and obtain satisfying convergence rates by a rigorous analysis. In particular, we show that the computational cost of the linear solver scales log-linear in the degrees of freedom.
求解偏微分方程的核方法在曲面上是无坐标工作的,对平滑解具有很高的逼近率。事实证明,局部拉格朗日基减轻了通常核方法在数据拟合问题上的计算复杂性,但如何高效地数值求解基于核的 Galerkin 求解偏微分方程所产生的无条件线性方程组,是一个极具挑战性的问题,迄今为止尚未有文献解决这个问题。在本文中,我们将带有 τ≥2 周期的几何多网格方法框架应用于表面上的散乱准均匀点云。我们通过严格的分析表明,利用拉格朗日函数衰减可以加速由此产生的求解器,并获得令人满意的收敛率。我们特别指出,线性求解器的计算成本与自由度成对数线性关系。
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引用次数: 0
Space-filling designs on Riemannian manifolds 黎曼流形上的空间填充设计
IF 1.8 2区 数学 Q1 MATHEMATICS Pub Date : 2024-09-24 DOI: 10.1016/j.jco.2024.101899
Mingyao Ai , Yunfan Yang , Xiangshun Kong
This paper proposes a new approach to generating space-filling designs over Riemannian manifolds by using a Hilbert curve. Different from ordinary Euclidean spaces, a novel transformation is constructed to link the uniform distribution over a Riemannian manifold and that over its parameter space. Using this transformation, the uniformity of the design points in the sense of Riemannian volume measure can be guaranteed by the intrinsic measure preserving property of the Hilbert curve. It is proved that these generated designs are not only asymptotically optimal under minimax and maximin distance criteria, but also perform well in minimizing the Wasserstein distance from the target distribution and controlling the estimation error in numerical integration. Furthermore, an efficient algorithm is developed for numerical generation of these space-filling designs. The advantages of the new approach are verified through numerical simulations.
本文提出了一种利用希尔伯特曲线在黎曼流形上生成空间填充设计的新方法。与普通欧几里得空间不同,本文构建了一种新的变换,将黎曼流形上的均匀分布与其参数空间上的均匀分布联系起来。利用这种变换,可以通过希尔伯特曲线的内在度量保持特性,保证设计点在黎曼体积度量意义上的均匀性。研究证明,这些生成的设计不仅在最小距离和最大距离准则下是渐近最优的,而且在最小化与目标分布的 Wasserstein 距离和控制数值积分中的估计误差方面也表现出色。此外,还为这些空间填充设计的数值生成开发了一种高效算法。通过数值模拟验证了新方法的优势。
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引用次数: 0
On the number of solutions to a random instance of the permuted kernel problem 关于包络核问题随机实例的解数
IF 1.8 2区 数学 Q1 MATHEMATICS Pub Date : 2024-09-24 DOI: 10.1016/j.jco.2024.101898
Carlo Sanna
The Permuted Kernel Problem (PKP) is a problem in linear algebra that was first introduced by Shamir in 1989. Roughly speaking, given an ×m matrix A and an m×1 vector b over a finite field of q elements Fq, the PKP asks to find an m×m permutation matrix π such that πb belongs to the kernel of A. In recent years, several post-quantum digital signature schemes whose security can be provably reduced to the hardness of solving random instances of the PKP have been proposed. In this regard, it is important to know the expected number of solutions to a random instance of the PKP in terms of the parameters q,,m. Previous works have heuristically estimated the expected number of solutions to be m!/q.
We provide, and rigorously prove, exact formulas for the expected number of solutions to a random instance of the PKP and the related Inhomogeneous Permuted Kernel Problem (IPKP), considering two natural ways of generating random instances.
置换内核问题(PKP)是线性代数中的一个问题,由沙米尔于 1989 年首次提出。粗略地说,给定一个 ℓ×m 矩阵 A 和一个包含 q 个元素的有限域 Fq 上的 m×1 向量 b,PKP 要求找到一个 m×m 的置换矩阵 π,使得 πb 属于 A 的核。近年来,有人提出了几种后量子数字签名方案,这些方案的安全性可以证明简化为 PKP 随机实例的求解难度。在这方面,了解根据参数 q,ℓ,m 求解 PKP 随机实例的预期解数非常重要。考虑到随机实例的两种自然生成方式,我们提供并严格证明了 PKP 随机实例和相关的非均质珀尔帖内核问题(IPKP)的预期解数的精确公式。
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引用次数: 0
Convergence analysis of iteratively regularized Landweber iteration with uniformly convex constraints in Banach spaces 巴拿赫空间中具有均匀凸约束条件的迭代正则化 Landweber 迭代的收敛性分析
IF 1.8 2区 数学 Q1 MATHEMATICS Pub Date : 2024-09-13 DOI: 10.1016/j.jco.2024.101897
Gaurav Mittal , Harshit Bajpai , Ankik Kumar Giri

In Banach spaces, the convergence analysis of iteratively regularized Landweber iteration (IRLI) is recently studied via conditional stability estimates. But the formulation of IRLI does not include general non-smooth convex penalty functionals, which is essential to capture special characteristics of the sought solution. In this paper, we formulate a generalized form of IRLI so that its formulation includes general non-smooth uniformly convex penalty functionals. We study the convergence analysis and derive the convergence rates of the generalized method solely via conditional stability estimates in Banach spaces for both the perturbed and unperturbed data. We also discuss few examples of inverse problems on which our method is applicable.

在巴拿赫空间中,最近通过条件稳定性估计研究了迭代正则化兰德韦伯迭代(IRLI)的收敛分析。但是,IRLI 的表述并不包括一般的非光滑凸惩罚函数,而这对于捕捉所求解的特殊性至关重要。在本文中,我们提出了 IRLI 的广义形式,使其表述包含一般非光滑均匀凸惩罚函数。我们研究了收敛分析,并通过巴拿赫空间中的条件稳定性估计,得出了广义方法对扰动和非扰动数据的收敛率。我们还讨论了我们的方法适用于逆问题的几个例子。
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引用次数: 0
High-efficiency parametric iterative schemes for solving nonlinear equations with and without memory 求解有内存和无内存非线性方程的高效参数迭代方案
IF 1.8 2区 数学 Q1 MATHEMATICS Pub Date : 2024-09-11 DOI: 10.1016/j.jco.2024.101896
Raziyeh Erfanifar, Masoud Hajarian

Many practical problems, such as the Malthusian population growth model, eigenvalue computations for matrices, and solving the Van der Waals' ideal gas equation, inherently involve nonlinearities. This paper initially introduces a two-parameter iterative scheme with a convergence order of two. Building on this, a three-parameter scheme with a convergence order of four is proposed. Then we extend these schemes into higher-order schemes with memory using Newton's interpolation, achieving an upper bound for the efficiency index of 7.88748131.99057. Finally, we validate the new schemes by solving various numerical and practical examples, demonstrating their superior efficiency in terms of computational cost, CPU time, and accuracy compared to existing methods.

许多实际问题,如马尔萨斯人口增长模型、矩阵的特征值计算以及范德瓦耳斯理想气体方程的求解,本质上都涉及非线性问题。本文首先介绍了收敛阶数为 2 的双参数迭代方案。在此基础上,提出了收敛阶数为四的三参数方案。然后,我们利用牛顿插值法将这些方案扩展为具有内存的高阶方案,实现了 7.8874813≈1.99057 的效率指数上限。最后,我们通过求解各种数值和实际例子验证了新方案,证明与现有方法相比,它们在计算成本、CPU 时间和精度方面都具有更高的效率。
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引用次数: 0
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Journal of Complexity
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