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Solving Lonely Runner Conjecture through differential geometry 用微分几何解孤独流子猜想
IF 0.3 Pub Date : 2022-05-01 DOI: 10.2478/jamsi-2022-0002
V. Ďuriš, T. Šumný, D. Gonda, T. Lengyelfalusy
Abstract The Lonely Runner Conjecture is a known open problem that was defined by Wills in 1967 and in 1973 also by Cusick independently of Wills. If we suppose n runners having distinct constant speeds start at a common point and run laps on a circular track with a unit length, then for any given runner, there is a time at which the distance of that runner is at least 1/n from every other runner. There exist several hypothesis verifications for different n mostly based on principles of approximation using number theory. However, the general solution of the conjecture for any n is still an open problem. In our work we will use a unique approach to verify the Lonely Runner Conjecture by the methods of differential geometry, which presents a non-standard solution, but demonstrates to be a suitable method for solving this type of problems. In the paper we will show also the procedure to build an algorithm that shows the possible existence of a solution for any number of runners.
孤独奔跑者猜想是一个已知的开放问题,由威尔斯于1967年提出,1973年由库西克独立于威尔斯提出。如果我们假设n个具有不同恒定速度的跑步者从一个公共点出发,在单位长度的圆形跑道上跑圈,那么对于任何给定的跑步者,存在一个时间点,该跑步者与其他跑步者的距离至少为1/n。对于不同的n,存在几种假设验证,大多基于数论的近似原理。然而,对于任意n,该猜想的通解仍然是一个开放问题。在我们的工作中,我们将使用一种独特的方法通过微分几何的方法来验证孤独的奔跑者猜想,它提出了一个非标准的解决方案,但证明是解决这类问题的合适方法。在本文中,我们还将展示构建一个算法的过程,该算法可以显示任意数量的跑步者的解决方案的可能存在性。
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引用次数: 0
A note on generalized subclasses of multivalent quasi-convex functions 关于多价拟凸函数的广义子类的一个注记
IF 0.3 Pub Date : 2022-05-01 DOI: 10.2478/jamsi-2022-0007
G. Singh, G. Singh
Abstract This paper is concerned with certain generalized subclasses of multivalent quasi-convex functions defined with subordination. Various properties of these classes in regard to the coefficient estimates, distortion theorems, growth theorems, argument theorems and inclusion relations are discussed. Also, the relations with the earlier known results are established.
本文讨论了用隶属定义的多价拟凸函数的某些广义子类。讨论了这些类关于系数估计、畸变定理、增长定理、自变量定理和包含关系的各种性质。此外,还建立了与早期已知结果的关系。
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引用次数: 0
Fractional Simpson like type inequalities for differentiable s-convex functions 可微s-凸函数的分式Simpson型不等式
IF 0.3 Pub Date : 2022-05-01 DOI: 10.2478/jamsi-2022-0006
N. Kamouche, S. Ghomrani, B. Meftah
Abstract In this paper, based on new identity we establish some new Simpson like type inequalities for functions whose first derivatives are s-convex via Riemann-Liouville fractional integrals. The case where the derivatives are bounded as well as the case where the derivatives satisfy the Hölder condition are also discussed. The obtained results extend some known results and refine another one. Applications of the results are given at the end.
摘要本文基于新恒等式,通过Riemann-Liouville分数积分,建立了一阶导数为s-凸函数的一些新的类Simpson型不等式。还讨论了导数有界的情况以及导数满足Hölder条件的情况。所获得的结果扩展了一些已知的结果并改进了另一个结果。最后给出了结果的应用。
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引用次数: 2
Model choice for regression models with a categorical response 具有分类响应的回归模型的模型选择
IF 0.3 Pub Date : 2022-05-01 DOI: 10.2478/jamsi-2022-0005
J. Kalina
Abstract The multinomial logit model and the cumulative logit model represent two important tools for regression modeling with a categorical response with numerous applications in various fields. First, this paper presents a systematic review of these two models including available tools for model choice (model selection). Then, numerical experiments are presented for two real datasets with an ordinal categorical response. These experiments reveal that a backward model choice procedure by means of hypothesis testing is more effective compared to a procedure based on Akaike information criterion. While the tendency of the backward selection to be superior to Akaike information criterion has recently been justified in linear regression, such a result seems not to have been presented for models with a categorical response. In addition, we report a mistake in VGAM package of R software, which has however no influence on the process of model choice.
多项logit模型和累积logit模型是回归建模的两种重要工具,具有分类响应,在各个领域都有广泛的应用。首先,本文系统地回顾了这两个模型,包括模型选择(模型选择)的可用工具。然后,对两个具有有序分类响应的真实数据集进行了数值实验。实验结果表明,基于假设检验的后向模型选择过程比基于赤池信息准则的后向模型选择过程更有效。虽然反向选择优于赤池信息标准的趋势最近在线性回归中得到了证明,但这种结果似乎没有出现在具有分类响应的模型中。此外,我们报告了R软件的VGAM包错误,但这对模型选择过程没有影响。
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引用次数: 0
Numerical Solution of Boundary Value Problems for Second Order Fuzzy Linear Differential Equations 二阶模糊线性微分方程边值问题的数值解
IF 0.3 Pub Date : 2022-01-01 DOI: 10.22457/jmi.v22a06207
Haixia Wang
In this paper, the numerical solution of the boundary value problem for second order fuzzy linear differential equations is discussed. We consider the fuzzy difference equation to replace the fuzzy differential equation. The numerical solution of the boundary value problem is obtained by calculating the fuzzy difference equation. Finally, an example is given, to verify the effectiveness of this method.
本文讨论了二阶模糊线性微分方程边值问题的数值解。我们考虑用模糊差分方程来代替模糊微分方程。通过计算模糊差分方程,得到了边值问题的数值解。最后给出了一个算例,验证了该方法的有效性。
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引用次数: 1
Analytical Investigation of Third-Order Time-Fractional Dispersive Partial Differential Equations Using Sumudu Transform Iterative Method 用Sumudu变换迭代法分析三阶时间分数阶色散偏微分方程
IF 0.3 Pub Date : 2022-01-01 DOI: 10.22457/jmi.v23a02210
R. K. Bairwa
This paper investigates the approximate analytical solutions of third-order timefractional dispersive partial differential equations in one-and higher-dimensional spaces by employing a newly developed analytical method, the Sumudu transform iterative method. To express fractional derivatives, the Caputo operator is used. Furthermore, the results of this investigation are graphically represented, and the solution graphs reveal that the approximate solutions are closely connected to the exact solutions.
本文采用一种新的解析方法——Sumudu变换迭代法,研究了一维和高维空间中三阶时间分数阶色散偏微分方程的近似解析解。为了表示分数阶导数,使用卡普托算子。此外,本研究的结果用图形表示,解图显示了近似解与精确解密切相关。
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引用次数: 1
Bézier Curves and Surfaces with three Parameters and Extensions in the Triangular Domain 三参数bsamizier曲线曲面及其在三角域上的扩展
IF 0.3 Pub Date : 2022-01-01 DOI: 10.22457/jmi.v22a04204
Wang Lu, Zhang Guicang
To define a new basis function to obtain a basis that can inherit the excellent properties of the traditional B-spline method and Bézier method, global and locality of shape adjustment, and can accurately represent the elliptical arc and circle. Firstly, an optimal standard full positive base, the cut angle algorithm, the 1 C and 2 C continuous proof of the base under the quasi-extended Chebyshev space in this paper. Secondly, the base on the rectangular field to the triangular field to obtain the quasi-cubic triangular Bernstein-Bézier base on the triangular field. Thirdly, this base can accurately represent the elliptic arc and circle, and then gives the base cutting algorithm on the triangular domain, and reverse introduce two conditions under which the quasi-cubic triangular Bernstein-Bézier surfaces are 1 G continuous in surface splicing. After a lot of analysis and examples, the new basis function has excellent properties of traditional methods, and can also flexibly adjust the shape parameters to obtain the required curve surface, which meets the actual industrial design requirements.
定义一种新的基函数,得到一种既能继承传统b样条法和bsamzier法的优良性质,又能进行形状调整的全局性和局域性,并能准确表示椭圆圆弧和圆的基函数。本文首先给出了最优标准满正基、切角算法、拟扩展Chebyshev空间下该基的1c和2c连续证明。其次,将矩形场上的基移到三角形场上,得到拟三次三角形的bernstein - bsamzier基在三角形场上。第三,该基基能准确表示椭圆弧和圆,然后给出了三角形域上的基基切割算法,并反向引入了拟三次三角形bernstein - bsamzier曲面在曲面拼接中为1g连续的两个条件。经过大量的分析和算例,新的基函数具有传统方法的优良性能,还可以灵活地调整形状参数以获得所需的曲面,满足实际工业设计要求。
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引用次数: 1
On the Diophantine Equation (p+6)x - p y = z2 where p is a Prime Number with p ≡ 1 (mod 28) 丢番图方程(p+6)x - p y = z2,其中p是素数,p≡1 (mod 28)
IF 0.3 Pub Date : 2022-01-01 DOI: 10.22457/jmi.v23a05213
S. Tadee
This paper shows that the Diophantine equation (p+6)x - p y = z2 where p is a prime number with p ≡ 1 (mod 28), has a unique non-negative integer solution. The solution is ( , , ) (0,0,0) x y z = .
本文证明了丢芬图方程(p+6)x - p y = z2,其中p是素数,且p≡1 (mod 28),具有唯一的非负整数解。解是(,,)(0,0,0)x y z =。
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引用次数: 0
A Further Study on L-Fuzzy Covering Rough Sets l -模糊覆盖粗糙集的进一步研究
IF 0.3 Pub Date : 2022-01-01 DOI: 10.22457/jmi.v22a05208
Yao-liang Xu, Dan-dan Zou, LingYue Li
For L L = ∗ → ( , , ) a complete residuated lattice, a type of L -fuzzy covering rough sets was defined by Li [8] in 2017. In this paper, a further study on rough sets was given. Precisely, a single axiomatic characterization of the L -fuzzy covering rough sets was presented, and the relationships between the -fuzzy covering rough sets and L -fuzzy relation rough sets were established.
对于L L =∗→(,,)完全剩馀格,Li[8]在2017年定义了一类L -模糊覆盖粗糙集。本文对粗糙集进行了进一步的研究。准确地说,给出了L -模糊覆盖粗糙集的单一公理化表征,并建立了-模糊覆盖粗糙集与L -模糊关系粗糙集之间的关系。
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引用次数: 0
The Shadowed Set, Intuitionistic Fuzzy Set and their Three-way Decision 阴影集、直觉模糊集及其三向决策
IF 0.3 Pub Date : 2022-01-01 DOI: 10.22457/jmi.v22a02206
Guangpeng Ta, Z. Gong
The theory of three-way decision provides an effective tool for decision-making under uncertainty and incomplete information when a two-way decision is difficult to make. In this paper, we try to transform an intuitionistic fuzzy set into a pessimistic shadowed set or an optimistic shadowed set by using two intuitionistic fuzzy parameters and the classical shadowed set. Accordingly, the pessimistic three-way decision or the optimistic three-way decision of intuitionistic fuzzy set are investigated by means of the proposed shadowed sets. In addition, a method to calculate the thresholds by the minimum cost principle is proposed and some examples are given for illustrating the validity of the method.
三向决策理论为不确定和信息不完全情况下双向决策难以进行时的决策提供了有效的工具。本文尝试利用两个直觉模糊参数和经典阴影集,将直觉模糊集转化为悲观阴影集或乐观阴影集。据此,利用所提出的阴影集研究了直觉模糊集的悲观三向决策和乐观三向决策。此外,提出了一种用最小代价原理计算阈值的方法,并通过算例说明了该方法的有效性。
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引用次数: 1
期刊
Journal of Applied Mathematics Statistics and Informatics
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