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Generalized Fibonacci–Leonardo numbers 广义斐波那契-列奥纳多数
4区 数学 Q1 Mathematics Pub Date : 2023-10-04 DOI: 10.1080/10236198.2023.2265509
Urszula Bednarz, Małgorzata Wołowiec-Musiał
AbstractIn this paper, by means of independent sets in a graph with multiplicity assigned to each set, we introduce generalized Fibonacci–Leonardo numbers, which are the common generalization of the classical Fibonacci and Leonardo numbers. We give the Binet formula, the generating function, and we prove some identities for generalized Fibonacci–Leonardo numbers. We also define matrix generators for the introduced numbers.Keywords: Fibonacci numbersLeonardo numbersindependent setsmatrix generatorAMS CLASSIFICATIONS: 11B3711B3911C20 AcknowledgmentsThe authors wish to thank the referee for all suggestions which improved this paper.Disclosure statementNo potential conflict of interest was reported by the author(s).
摘要本文利用图中具有多重性的独立集,引入了广义Fibonacci - Leonardo数,它是经典Fibonacci数和Leonardo数的一般推广。给出了Binet公式和生成函数,并证明了一些广义fibonaci - leonardo数的恒等式。我们还为引入的数定义了矩阵生成器。关键词:斐波那契数莱昂纳多数独立集矩阵生成器ams分类:11B3711B3911C20致谢感谢审稿人对本文的改进提出的建议。披露声明作者未报告潜在的利益冲突。
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引用次数: 0
Attractive sets of periodic integrodifference equations under discretization 离散化下周期积分差分方程的吸引集
4区 数学 Q1 Mathematics Pub Date : 2023-10-04 DOI: 10.1080/10236198.2023.2262613
Peter E. Kloeden, Christian Pötzsche
We consider periodic difference equations in infinite-dimensional Banach spaces possessing compact asymptotically stable set A. It is established that such A persists under spatial discretizations by means of projection methods as nearby closed and bounded uniformly asymptotically stable sets, which moreover converge to A in the Hausdorff metric for increasingly more accurate schemes. The proof is based on a Lyapunov function guaranteed by an ambient converse theorem and a pullback construction. As application serves integrodifference equations on spaces of continuous and p-integrable functions over a compact habitat.
考虑无限维Banach空间中具有紧的渐近稳定集A的周期差分方程,利用投影方法证明了在空间离散化下,A是邻近的闭有界一致渐近稳定集,并且在越来越精确的格式下收敛于Hausdorff度量中的A。该证明基于由环境逆定理和回拉构造保证的李雅普诺夫函数。作为在紧生境上连续函数和p可积函数空间上的积分差分方程的应用。
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引用次数: 0
Capturing chaos: a multidisciplinary approach to nonlinear population dynamics 捕捉混沌:非线性种群动力学的多学科方法
4区 数学 Q1 Mathematics Pub Date : 2023-09-29 DOI: 10.1080/10236198.2023.2260013
Robert A. Desharnais, Shandelle M. Henson, R. F. Costantino, Brian Dennis
AbstractThe hypothesis of chaotic population dynamics was proposed in ecology by Robert May in the mid-1970s. At that time the idea was controversial, and it remains a fascinating and unsettled issue today. We report the results of a 20-year laboratory research programme that continued in the tradition of the pioneering ecologist Thomas Park using the Tribolium flour beetle model. We present biological evidence of complex population dynamics – including bifurcations, chaos, saddle nodes, phase switching, resonance effects, and multiple attractors – by using a low-dimensional difference equation model for Tribolium together with carefully designed, conducted, and statistically analysed experiments. The model, parameterized with data, also explains the results of historical Tribolium experiments, such as the classical competition studies of Thomas Park and his colleagues. Our research programme has inspired other studies using the Tribolium mathematical and laboratory model. This work was conducted by a multidisciplinary team, which included Jim Cushing.KEYWORDS: Nonlinear dynamicspopulation ecologyTriboliumchaosstochasticity AcknowledgementsWe congratulate Jim on the occasion of his 80th birthday and for his outstanding career. He was a key member of the ‘Beetle Team,’ a multidisciplinary collaborative research group focused on the integration of nonlinear dynamics theory, statistics, and biological experimentation. The members of the Beetle Team were Jim Cushing, R. F. Costantino, Brian Dennis, Robert A. Desharnais, Shandelle M. Henson, Aaron A. King, and Jeffrey Edmunds. We are grateful to the U.S. National Science Foundation, and the American public who support NSF through their taxes, for the opportunity to pursue our passionate desire to strengthen the empirical ties among ecology, statistics, and mathematics.Data availability statementAll of the data from beetle team research programme are publicly available at Dryad in the Beetle Team Tribolium Data Archive: https://doi.org/10.5061/dryad.qjq2bvqmpDisclosure statementNo potential conflict of interest was reported by the author(s).Additional informationFundingThe Beetle Team research programme was supported by grants from the U.S. National Science Foundation [grant numbers DMS 9206678, DMS 9306271, DMS 9319073, DMS 9616205, DMS 9625576, DMS 9973126, DMS 9981374, DMS 9981423, DMS 9981458, DMS 0210474].
摘要20世纪70年代中期,罗伯特·梅在生态学中提出了混沌种群动力学假说。当时这个想法是有争议的,今天它仍然是一个迷人而悬而未决的问题。我们报告了一个20年的实验室研究项目的结果,该项目延续了开创性生态学家托马斯·帕克使用Tribolium面粉甲虫模型的传统。通过使用Tribolium的低维差分方程模型以及精心设计、实施和统计分析的实验,我们展示了复杂种群动态的生物学证据,包括分岔、混沌、鞍节点、相位开关、共振效应和多个吸引子。这个用数据参数化的模型也解释了历史上的Tribolium实验的结果,比如托马斯·帕克和他的同事们的经典竞争研究。我们的研究项目启发了其他使用Tribolium数学和实验室模型的研究。这项工作是由一个多学科团队进行的,其中包括吉姆·库欣。关键词:非线性动态种群生态学triboliblumchaos随机性鸣谢在吉姆八十大寿之际,我们祝贺他杰出的事业。他是“甲虫团队”的重要成员,“甲虫团队”是一个多学科合作研究小组,专注于非线性动力学理论、统计学和生物实验的整合。甲壳虫团队的成员是吉姆·库欣、r·f·科斯坦蒂诺、布莱恩·丹尼斯、罗伯特·a·德沙纳斯、香德尔·m·汉森、亚伦·a·金和杰弗里·埃德蒙兹。我们感谢美国国家科学基金会和通过纳税支持NSF的美国公众,感谢他们给我们机会去追求我们热切的愿望,加强生态学、统计学和数学之间的经验联系。数据可用性声明甲虫团队研究项目的所有数据都可以在甲虫团队Tribolium数据档案馆的Dryad上公开获取:https://doi.org/10.5061/dryad.qjq2bvqmpDisclosure声明作者未报告潜在的利益冲突。甲壳虫团队的研究项目由美国国家科学基金会资助[资助号:DMS 9206678、DMS 9306271、DMS 9319073、DMS 9616205、DMS 9625576、DMS 9973126、DMS 9981374、DMS 9981423、DMS 9981458、DMS 0210474]。
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引用次数: 0
On some rational piecewise linear rotations 在一些有理分段线性旋转上
4区 数学 Q1 Mathematics Pub Date : 2023-09-26 DOI: 10.1080/10236198.2023.2260898
Anna Cima, Armengol Gasull, Víctor Mañosa, Francesc Mañosas
AbstractWe study the dynamics of the piecewise planar rotations Fλ(z)=λ(z−H(z)), with z∈C, H(z)=1 if Im(z)≥0, H(z)=−1 if Im(z)<0, and λ=eiα∈C, being α a rational multiple of π. Our main results establish the dynamics in the so called regular set, which is the complementary of the closure of the set formed by the preimages of the discontinuity line. We prove that any connected component of this set is open, bounded and periodic under the action of Fλ, with a period ℓ, that depends on the connected component. Furthermore, Fλℓ restricted to each component acts as a rotation with a period which also depends on the connected component. As a consequence, any point in the regular set is periodic. Among other results, we also prove that for any connected component of the regular set, its boundary is a convex polygon with certain maximum number of sides.Keywords: Periodic pointspointwise periodic mapspiecewise linear mapsfractal tessellationsMathematics Subject Classifications: 37C2539A2337B10 AcknowledgmentsWe thank our colleague Roser Guardia for the indications regarding the scale factor of the critical set that we mentioned in Section 4.Disclosure statementNo potential conflict of interest was reported by the author(s).Additional informationFundingThe first, second and fourth authors are supported by Ministry of Science and Innovation–State Research Agency of the Spanish Government through grants PID2019-104658GB-I00 (first and second authors) and MTM2017-86795-C3-1-P (fourth autor). They are also supported by the grant 2021-SGR-00113 from AGAUR. The second author is supported by grant Severo Ochoa and María de Maeztu Program for Centers and Units of Excellence in R&D (CEX2020-001084-M). The third author acknowledges the group research recognition 2021-SGR-01039 from AGAUR.
摘要研究了当z∈C,当Im(z)≥0时H(z)=1,当Im(z)<0时H(z)= - 1,且λ=eiα∈C, α是π的有理倍时,分段平面旋转的动力学。我们的主要结果建立了所谓正则集中的动力学,它是由不连续线的原像形成的集合的闭包的补充。我们证明了在Fλ作用下,这个集合的任何连通分量都是开的、有界的、周期的,其周期取决于连通分量。此外,限制于每个分量的Fλ r作为具有周期的旋转,周期也取决于所连接的分量。因此,正则集中的任何点都是周期性的。在其他结果中,我们还证明了对于正则集的任何连通分量,其边界是一个具有一定最大边数的凸多边形。关键词:周期点-点-周期映射-分段-线性映射-分形曲面关系数学学科分类:37C2539A2337B10致谢我们感谢我们的同事Roser Guardia关于我们在第4节中提到的临界集的比例因子的指示。披露声明作者未报告潜在的利益冲突。论文的第一、二、四作者由西班牙政府科学与创新部国家研究机构资助,资助项目为PID2019-104658GB-I00(第一、二作者)和MTM2017-86795-C3-1-P(第四作者)。他们也得到了AGAUR的2021-SGR-00113基金的支持。第二作者由Severo Ochoa基金和María de Maeztu卓越研发中心和单位计划(CEX2020-001084-M)资助。第三作者感谢AGAUR的小组研究认可2021-SGR-01039。
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引用次数: 0
Dynamics of a rational map: unbounded cycles, unbounded chaotic intervals and organizing centres 有理图的动力学:无界循环、无界混沌间隔和组织中心
4区 数学 Q1 Mathematics Pub Date : 2023-09-13 DOI: 10.1080/10236198.2023.2253329
Laura Gardini, Iryna Sushko, Wirot Tikjha
A one-dimensional rational map f(x)=(x2−a)/(x2−b) depending on the two parameters a and b is considered. Sequences of bifurcations peculiar of rational maps are evidenced, as those occurring due to unbounded cycles (that is, periodic orbits having one point at infinity, related to the vertical asymptotes) that are superstable, as well as to unbounded chaotic intervals. Moreover, two particular bifurcation points, having the role of organizing centres in the (a,b)-parameter plane, are studied. Each point is related to a pair of conditions, which allow us to consider them as the bifurcation points of codimension-2, as it is usual for this kind of organizing centres. However, the two conditions are related not to bifurcations but to degeneracies in the graph of the function. The sequences of bifurcations leading to attracting cycles associated with these particular points are investigated, analytically and numerically, making use of particular properties of the rational map.
考虑了依赖于两个参数A和b的一维有理映射f(x)=(x2−A)/(x2−b)。由于超稳定的无界循环(即在无穷远处有一个点的周期轨道,与垂直渐近线相关)以及无界混沌区间所发生的无界循环,证明了有理图特有的分支序列。此外,研究了在(a,b)参数平面上具有组织中心作用的两个特殊分岔点。每个点都与一对条件有关,这使我们能够将它们视为共维-2的分岔点,因为这类组织中心通常是这样的。然而,这两个条件不是与分岔有关,而是与函数图中的退化有关。利用有理映射的特殊性质,用解析和数值方法研究了与这些特殊点相关的引起吸引环的分岔序列。
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引用次数: 0
Statement of Retraction: on the dynamics of hypersurfaces foliated byn−2-dimensional oriented hyperspheres in Sn 缩回声明:锡中n - 2维取向超球片理超曲面动力学
IF 1.1 4区 数学 Q1 Mathematics Pub Date : 2023-08-29 DOI: 10.1080/10236198.2023.2252712
Published in Journal of Difference Equations and Applications (Vol. 29, No. 7, 2023)
发表于《差分方程与应用》(Vol. 29, No. 7, 2023)
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引用次数: 0
Statement of retraction: A generalized real option pricing method of R&D investments: jump diffusion and external competition 撤回声明:研发投资的广义实物期权定价方法:跳跃扩散和外部竞争
IF 1.1 4区 数学 Q1 Mathematics Pub Date : 2023-08-29 DOI: 10.1080/10236198.2023.2252717
Published in Journal of Difference Equations and Applications (Vol. 29, No. 7, 2023)
发表于《差分方程与应用》(Vol. 29, No. 7, 2023)
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引用次数: 0
Continuity of the spectral radius, applied to structured semelparous two-sex population models 谱半径的连续性,应用于结构半生育两性种群模型
IF 1.1 4区 数学 Q1 Mathematics Pub Date : 2023-08-25 DOI: 10.1080/10236198.2023.2249129
H. Thieme
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引用次数: 0
Variational principles for pointwise preimage entropies 点前像熵的变分原理
4区 数学 Q1 Mathematics Pub Date : 2023-08-03 DOI: 10.1080/10236198.2023.2263094
Yaling Shi, Kesong Yan, Fanping Zeng
AbstractBased on the preimage structure of the system (X,T), Hurley introduced the notion of pointwise topological preimage entropies hm(T) and hp(T). Furthermore, from the measure-theoretic point of view, Wu and Zhu introduced a notion of pointwise metric preimage entropy hm,μ(T) for a T-invariant measure µ on X, and obtained the variational principle between hm,μ(T) and hm(T) under the condition of uniform separation of preimages. A natural question is whether a variational principle for hm(T) and hm,μ(T) without any additional assumptions. In this paper, we define a new version of topological preimage entropy hm(T|μ) relative to a T-invariant measure µ, and show that the inequality hm,μ(T)⩽hm(T|μ)⩽hp(T) holds for every T-invariant probability measure µ. As a consequence, we obtain that there is a topological dynamical system (X,T) such that the following strict inequality holds: supμ∈M(X,T)hm,μ(T)
摘要基于系统(X,T)的预像结构,Hurley引入了点向拓扑预像熵hm(T)和hp(T)的概念。此外,Wu和Zhu从测度论的角度,对X上的T不变测度引入了点向度量原像熵hm,μ(T)的概念,得到了原像均匀分离条件下hm,μ(T)和hm(T)之间的变分原理。一个自然的问题是,在没有任何额外假设的情况下,hm(T)和hm,μ(T)的变分原理是否。本文定义了相对于T不变测度μ的一个新的拓扑原像熵hm(T|μ),并证明了不等式hm,μ(T)≤hm(T|μ)≤hp(T)对于每一个T不变概率测度μ都成立。因此,我们得到了存在一个拓扑动力系统(X,T),使得以下严格不等式成立:supμ∈M(X,T)hm,μ(T)
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引用次数: 0
Correction Statement 更正声明
4区 数学 Q1 Mathematics Pub Date : 2023-08-03 DOI: 10.1080/10236198.2023.2254625
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引用次数: 0
期刊
Journal of Difference Equations and Applications
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