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"C´iric´ type cyclic contractions and their best cyclic periodic points" C ' iric '型循环收缩及其最佳循环周期点
IF 1.4 4区 数学 Q1 Mathematics Pub Date : 2022-02-28 DOI: 10.37193/cjm.2022.02.04
M. Aslantaş, H. Sahin, I. Altun
"In the present paper, by introducing a new notion named as nonunique cyclic contractions, we give some best proximity point results for such mappings. Then, we indicate the shortcoming of the concept of best periodic proximity point which is defined for cyclic mapping by giving a simple example. To overcome this deficiency, we give a more suitable definition named as best cyclic periodic point. Finally, we obtain some best cyclic periodic point theorems, including the famous periodic point result of C´ iric´ [C´ iric´, L. B. On some maps with a nonunique fixed point. Institut Mathe´matique 17 (1974), 52–58.], for nonunique cyclic contractions. We also provide some illustrative and comparative examples to support our results."
本文引入了一个新的概念,称为非唯一循环收缩,给出了这类映射的一些最佳邻近点结果。然后,我们通过一个简单的例子指出了为循环映射定义的最佳周期邻近点概念的不足。为了克服这一不足,我们给出了一个更合适的定义,称为最佳循环周期点。最后,我们得到了一些最好的循环周期点定理,包括著名的C´iric´的周期点结果[C´iric´,L.B.在一些具有非唯一不动点的映射上。Institut Mathe´matique 17(1974),52–58.],关于非唯一循环收缩。我们还提供了一些说明性和比较性的例子来支持我们的结果。“
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引用次数: 0
"On the real projections of zeros of analytic almost periodic functions" 关于解析概周期函数零点的实投影
IF 1.4 4区 数学 Q1 Mathematics Pub Date : 2022-02-28 DOI: 10.37193/cjm.2022.02.18
J. M. Sepulcre, T. Vidal
"This paper deals with the sets of real projections of zeros of analytic almost periodic functions defined in a vertical strip. By using our equivalence relation introduced in the context of the complex functions which can be represented by a Dirichlet-like series, this work provides practical results in order to determine whether a real number belongs to the closure of such a set. Its main result shows that, in the case that the Fourier exponents of an analytic almost periodic function are linearly independent over the rational numbers, such a set has no isolated points."
本文讨论了定义在垂直条带上的解析概周期函数的零点实投影集。利用我们在类狄利克雷级数表示的复函数中引入的等价关系,为确定实数是否属于这一集的闭包提供了实际结果t表明,在解析概周期函数的傅立叶指数在有理数上线性无关的情况下,这样的集合没有孤立点。“
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引用次数: 0
"Some sequences of Euler type, their convergences and their stability" 若干欧拉型序列及其收敛性和稳定性
IF 1.4 4区 数学 Q1 Mathematics Pub Date : 2022-02-28 DOI: 10.37193/cjm.2022.02.16
D. Marinescu, M. Monea
"The aim of this paper is to present some sequences of Euler type. We will explore the sequences $left( F_{n}right) _{ngeq 1},$ defined by $% F_{n}left( xright) =sum_{k=1}^{n}fleft( kright) -int_{1}^{n+x}fleft( tright) dt,$ for any $ngeq 1$ and $xin left[ 0,1right] ,$ where $f$ is a local integrable and positive function defined on $left[ 1,infty right) $. Starting from some particular example we will find that this sequence is uniformly convergent to a constant function. Also, we present a stability result."
本文的目的是给出一些欧拉型数列。我们将探索序列$left(F_{n}right) _{ngeq 1},$定义为$% F_{n}left(xright) =sum_{k=1}^{n}fleft(kright) -int_{1}^{n+x}fleft(tright) dt,$适用于任意$ngeq 1$和$xin left[0,1right],$其中$f$是定义在$left[1,infty right) $上的一个局部可积正函数。从一些特殊的例子出发,我们将发现这个序列是一致收敛于一个常数函数的。此外,我们还提供了一个稳定的结果。”
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引用次数: 0
"An accelerated Visco-Cesaro means Tseng Type splitting method for fixed point and monotone inclusion problems" “不动点和单调包含问题的加速Visco-Cesaro均值Tseng型分裂方法”
IF 1.4 4区 数学 Q1 Mathematics Pub Date : 2022-02-28 DOI: 10.37193/cjm.2022.02.02
Yasir Arfat, P. Kumam, M. A. A. Khan, Parinya Sa Ngiamsunthorn
"In this paper, we study a variant of Tseng’s splitting method for monotone inclusion problem and fixed point problem associated with a finite family of η-demimetric mappings in Hilbert spaces. The proposed algorithm is based on the combination of classical Tseng’s method together with the viscosity Ces´aro means method and the Nesterov’s acceleration method. The proposed iterative method exhibits accelerated strong convergence characteristics under suitable set of control conditions in such framework. Finally, we provide a numerical example to illustrate the applicability of the proposed algorithm as well as some useful abstract applications."
在本文中,我们研究了Hilbert空间中与有限族η-半度量映射相关的单调包含问题和不动点问题的Tseng分裂方法的一个变体。所提出的算法是基于经典Tseng方法与粘性Ces´aro均值方法和Nesterov加速方法的结合在这样的框架中,在一组合适的控制条件下表现出加速的强收敛特性。最后,我们提供了一个数值例子来说明所提出的算法的适用性以及一些有用的抽象应用。“
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引用次数: 1
"On instability in the theory of dipolar bodies with two-temperatures" “关于具有两个温度的偶极体理论的不稳定性”
IF 1.4 4区 数学 Q1 Mathematics Pub Date : 2022-02-28 DOI: 10.37193/cjm.2022.02.15
M. Marin, S. Vlase, I. Fudulu, G. Precup
"In this paper we approach a generalized thermoelasticity theory based on a heat conduction equation in bodies with dipolar structure, the heat conduction depends on two distinct temperatures, the thermodynamic temperature and the conductive temperature. In our considerations the difference between two temperatures is highlighted by the heat supply. For the mixed initial boundary value problem defined in this context, we prove the uniqueness of a solution corresponding some specific initial and boundary conditions. Also, if the initial energy is negative or null, we prove that the solutions of the mixed problem are exponentially unstable."
“在本文中,我们基于偶极结构物体中的热传导方程,提出了一种广义热弹性理论,热传导取决于两个不同的温度,即热力学温度和传导温度。在我们的考虑中,两个温度之间的差异突出了供热。对于混合初边值问题在本文中,我们证明了一个对应于特定初始条件和边界条件的解的唯一性。此外,如果初始能量为负或为零,我们证明了混合问题的解是指数不稳定的。“
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引用次数: 0
About convex structures on metric spaces 关于度量空间上的凸结构
IF 1.4 4区 数学 Q1 Mathematics Pub Date : 2022-02-28 DOI: 10.37193/cjm.2022.02.10
M. Choban
"In the present paper we study the relationships between different concepts of convex structures in metric spaces that that are related to the works of K. Menger [Menger, K. Untersuchungen ""{u}ber allgemeine Metrik. {it Math. Ann.} {bf100} (1928), 75--163], H. Busemann [Busemann, H. {it The geometry of geodesics}, Academic Press, 1955], I. N. Herstein; J. Milnor [Herstein, I. N.; Milnor, J. An axiomatic approach to measurable utility. {it Econometrica} {bf21} (1953), 291--297], E. Michael [Michael, E. Convex structures and continuous selections. {it Canad. J. Math.} {bf11} (1959), 556--575], A. Nijenhuis [Nijenhuis, A. A note on hyperconvexity in Riemannian manifolds. {it Canad. J. Math.} {bf11} (1959), 576--582.], W. Takahashi; T. Shimizu [Shimizu, T.; Takahashi, W. Fixed points of multivalued mappings in certain metric spaces. {it Topol. Methods Nonlinear Anal.} {bf8} (1996), no. 1, 197--203 and Takahashi, W. A convexity in metric space and nonexpansive mappings I. {it Kodai Math. Sem. Rep.} {bf 22} (1970), 142--149], M. Taskovi'{c} [Taskovi'{c}, M. General convex topological spaces and fixed points. {it Math. Moravica} {bf 1} (1997), 127--134], Yu. A. Aminov [Aminov, Yu. A. Two-Dimensional Surfaces in 3-Dimensional and 4-Dimensional Euclidean Spaces. Results and Unsolved Problems. {it Ukr. Math. J.} {bf 71} (2019), no. 1, 1--38.], H. V. Machado [Machado, H. V. A characterization of convex subsets of normed spaces.{it Kodai Math. Sem. Rep.} {bf25} (1973), 307--320], and many other papers. Some well known examples of concrete convex structures are reexamined and the possibilities of different embeddings of metric spaces with convex structures are also studied. Corollary ref{C5.1} states that the Bolyai-Lobachevskii plane and the Bolyai-Lobachevskii half-plane are not isometrically embedding in some strictly convex normed space. A characteristic of the invariant metric generated by a norm is presented (Proposition ref{P4.1}). "
“在本文中,我们研究了度量空间中凸结构的不同概念之间的关系,这些概念与K.Menger的作品有关[Menger,K.Untersuchungen”{u}ber所有Metrik。{it Math.Ann.}{bf100}(1928),75-163],H.Busemann〔Busemann,H.测地线的几何〕,学术出版社,1955年〕,I.N.Herstein;J.Milnor[Herstein,I.N.;Milnor,J.可测量效用的公理化方法。{it Econometrica}{bf21}(1953),291-297},E.Michael〔Michael,E.凸结构和连续选择。{ it Canad.J.Math.}(1959),556-575〕,A.Nijenhuis〔Nijenheis,A.关于黎曼流形超凸性的注记;T.Shimizu[Shimizu,T.;Takahashi,W.某些度量空间中多值映射的不动点。拓扑方法非线性分析。(1996),第1197-2003号和Takahasi,W.度量空间中的凸性和非扩张映射。Kodai Math.Sem.Rep.(1970),142-149],M.Taskovi。一般凸拓扑空间和不动点。{bf 1}(1997),127-134],余。A.Aminov[Aminov,Yu.A.三维和四维欧几里得空间中的二维曲面。结果和未解决的问题。{bf71}(2019),第1,1-38.],H.V.Machado[Machado,H.V.赋范空间凸子集的刻画。{it Kodai Math.Sem.Rep.}{bf25}(1973),307-320],以及许多其他论文。对具体凸结构的一些著名例子进行了重新审视,并研究了具有凸结构的度量空间的不同嵌入的可能性。推论ref{C5.1}指出Bolyai-Lobachevskii平面和Bolyai-Logachevskii半平面不是等距嵌入在一些严格凸赋范空间中。给出了由范数生成的不变度量的一个特征(命题ref{P4.1})。”
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引用次数: 3
"The penalty method for generalized mixed variational-hemivariational inequality problems" 广义混合变分-半变分不等式问题的惩罚方法
IF 1.4 4区 数学 Q1 Mathematics Pub Date : 2022-02-28 DOI: 10.37193/cjm.2022.02.08
Shih-sen Chang, Salahuddin, A. Ahmadini, L. xilinx Wang, G. Wang
"It is well known that many popular variational, quasi-variational, hemivariational inequalities and variational inclusions involving constraints in a Banach space to convert a fixed point problems for finding the solution of such problems. This paper is to infuse a sequence of penalized problems without constraints and we show under the few reasonable assumptions to the Kuratowski upper limit with respect to the weak topology of the sets of solutions to penalized problems is nonempty. As an application, we explore two complicated partial differential systems of elliptic mixed boundary value problem involving a nonlinear nonhomogeneous differential operator with an obstacle effect, and a nonlinear elastic contact problem in mechanics with unilateral constraints."
“众所周知,在Banach空间中,许多流行的变分、拟变分、半变分不等式和含约束的变分包含将不动点问题转化为不动点问题的解关于惩罚问题的解集的弱拓扑是非空的。作为一个应用,我们研究了两个复杂的偏微分系统的椭圆混合边值问题,涉及一个具有障碍效应的非线性非齐次微分算子,以及一个具有单边约束的力学中的非线性弹性接触问题。“
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引用次数: 1
"Common endpoints of generalized Suzuki-Kannan-C´ iric´ type mappings in hyperbolic spaces" 双曲空间中广义Suzuki-Kannan-C ' iric '型映射的公共端点
IF 1.4 4区 数学 Q1 Mathematics Pub Date : 2022-02-28 DOI: 10.37193/cjm.2022.02.14
T. Laokul, B. Panyanak, N. Phudolsitthiphat, S. Suantai
"In this paper, we introduce the concept of generalized Suzuki-Kannan-C´ iric´ type mappings in metric spaces and show that it is weaker than the concept of Suzuki-Kannan-C´ iric´ type mappings but stronger than the concept of semi-nonexpansive mappings. Moreover, we obtain the semiclosed principle and endpoint theorems for the class of generalized Suzuki-Kannan-C´ iric´ type mappings. The strong and Δ−convergence theorems of the Kuhfitting iteration for this class of mappings are also discussed."
本文在度量空间中引入广义Suzuki-Kannan-C ' iric '型映射的概念,并证明它比Suzuki-Kannan-C ' iric '型映射的概念弱,但比半非扩张映射的概念强。此外,我们还得到了一类广义Suzuki-Kannan-C ' iric '型映射的半封闭原理和端点定理。讨论了该类映射的kuh拟合迭代的强收敛定理和Δ -收敛定理。
{"title":"\"Common endpoints of generalized Suzuki-Kannan-C´ iric´ type mappings in hyperbolic spaces\"","authors":"T. Laokul, B. Panyanak, N. Phudolsitthiphat, S. Suantai","doi":"10.37193/cjm.2022.02.14","DOIUrl":"https://doi.org/10.37193/cjm.2022.02.14","url":null,"abstract":"\"In this paper, we introduce the concept of generalized Suzuki-Kannan-C´ iric´ type mappings in metric spaces and show that it is weaker than the concept of Suzuki-Kannan-C´ iric´ type mappings but stronger than the concept of semi-nonexpansive mappings. Moreover, we obtain the semiclosed principle and endpoint theorems for the class of generalized Suzuki-Kannan-C´ iric´ type mappings. The strong and Δ−convergence theorems of the Kuhfitting iteration for this class of mappings are also discussed.\"","PeriodicalId":50711,"journal":{"name":"Carpathian Journal of Mathematics","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2022-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47286374","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
"On the crossing number of the join of the wheel on six vertices with a path" "在有路径的六个顶点的轮子连接处的交叉数上"
IF 1.4 4区 数学 Q1 Mathematics Pub Date : 2022-02-28 DOI: 10.37193/cjm.2022.02.06
"ŠTEFAN ŠTEFAN" Berežný, M. Staš
The crossing number $mathrm{cr}(G)$ of a graph $G$ is the minimum number of edge crossings over all drawings of $G$ in the plane. The main aim of the paper is to give the crossing number of join product $W_5+P_n$ for the wheel $W_5$ on six vertices, where $P_n$ is the path on $n$ vertices. Stav s and Valiska conjectured that the crossing number of $W_m+P_n$ is equal to $Z(m+1)Z(n) + (Z(m)-1) big lfloor frac{n}{2} big rfloor + n +1$, for all $mgeq 3$, $ngeq 2$, where Zarankiewicz's number is defined as $Z(n)=big lfloor frac{n}{2} big rfloor big lfloor frac{n-1}{2} big rfloor $ for $ngeq 1$. Recently, this conjecture was proved for $W_3+P_n$ by Klev sv c and Schr"otter, and for $W_4+P_n$ by Stav s and Valiska. We establish the validity of this conjecture for $W_5+P_n$. The conjecture also holds due to some isomorphisms for $W_m+P_2$, $W_m+P_3$ by Klev sv c, and for $W_m+P_4$ by Stav s for all $mgeq 3$.
图形$G$的交叉数$mathrm{cr}(G)$是平面中$G$所有图形的最小边交叉数。本文的主要目的是给出车轮$W_5$在六个顶点上的连接乘积$W_5+P_n$的交叉数,其中$P_n$是$n$顶点上的路径。Stav s和Valiska推测$W_m+P_n$的交叉数等于$Z(m+1)Z(n)+(Z(m)-1)biglfloorfrac{n}{2}bigrfloor+n+1$,对于所有$mgeq3$,$ngeq2$,其中Zarankiewicz的数定义为$Z(n rfloor$换$ngeq1$。最近,Kle和Schr分别证明了$W_3+P_n$和$W_4+P_n$的猜想,Sta和Valiska分别证明了这一猜想的有效性。
{"title":"\"On the crossing number of the join of the wheel on six vertices with a path\"","authors":"\"ŠTEFAN ŠTEFAN\" Berežný, M. Staš","doi":"10.37193/cjm.2022.02.06","DOIUrl":"https://doi.org/10.37193/cjm.2022.02.06","url":null,"abstract":"The crossing number $mathrm{cr}(G)$ of a graph $G$ is the minimum number of edge crossings over all drawings of $G$ in the plane. The main aim of the paper is to give the crossing number of join product $W_5+P_n$ for the wheel $W_5$ on six vertices, where $P_n$ is the path on $n$ vertices. Stav s and Valiska conjectured that the crossing number of $W_m+P_n$ is equal to $Z(m+1)Z(n) + (Z(m)-1) big lfloor frac{n}{2} big rfloor + n +1$, for all $mgeq 3$, $ngeq 2$, where Zarankiewicz's number is defined as $Z(n)=big lfloor frac{n}{2} big rfloor big lfloor frac{n-1}{2} big rfloor $ for $ngeq 1$. Recently, this conjecture was proved for $W_3+P_n$ by Klev sv c and Schr\"otter, and for $W_4+P_n$ by Stav s and Valiska. We establish the validity of this conjecture for $W_5+P_n$. The conjecture also holds due to some isomorphisms for $W_m+P_2$, $W_m+P_3$ by Klev sv c, and for $W_m+P_4$ by Stav s for all $mgeq 3$.","PeriodicalId":50711,"journal":{"name":"Carpathian Journal of Mathematics","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2022-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41584348","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Analysis of a nonlinear financial model 非线性财务模型的分析
IF 1.4 4区 数学 Q1 Mathematics Pub Date : 2022-02-28 DOI: 10.37193/cjm.2022.02.17
G. Moza, E. Grecu, L. Tirtirau
"A three-dimensional nonlinear differential system for modeling inflation rate in a given economy is proposed and investigated in this article. Using a bifurcation-based method in the study, we describe the conditions leading to regions of stability for the long-term behavior of the model, which are economically desirable, along with regions of instability, which should be avoided in an economy."
本文提出并研究了一个三维非线性微分系统,用于模拟给定经济中的通货膨胀率。在研究中使用基于分岔的方法,我们描述了导致模型长期行为稳定区域的条件,这在经济上是可取的,以及不稳定区域,这在经济中应该避免。”
{"title":"Analysis of a nonlinear financial model","authors":"G. Moza, E. Grecu, L. Tirtirau","doi":"10.37193/cjm.2022.02.17","DOIUrl":"https://doi.org/10.37193/cjm.2022.02.17","url":null,"abstract":"\"A three-dimensional nonlinear differential system for modeling inflation rate in a given economy is proposed and investigated in this article. Using a bifurcation-based method in the study, we describe the conditions leading to regions of stability for the long-term behavior of the model, which are economically desirable, along with regions of instability, which should be avoided in an economy.\"","PeriodicalId":50711,"journal":{"name":"Carpathian Journal of Mathematics","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2022-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48232357","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
期刊
Carpathian Journal of Mathematics
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