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Publications De L'institut Mathematique最新文献

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Refinements of some limit Hardy-type inequalities via superquadracity 利用超二次性对某些极限hardy型不等式的改进
Publications De L'institut Mathematique Pub Date : 2017-11-03 DOI: 10.2298/PIM1716231O
J. Oguntuase, L. Persson, O. Fabelurin, A. G. Adeagbo-Sheikh
{"title":"Refinements of some limit Hardy-type inequalities via superquadracity","authors":"J. Oguntuase, L. Persson, O. Fabelurin, A. G. Adeagbo-Sheikh","doi":"10.2298/PIM1716231O","DOIUrl":"https://doi.org/10.2298/PIM1716231O","url":null,"abstract":"Refinements of some limit Hardy-type inequalities are derived anddiscussed using the concept of superquadracity. We also proved that all threeconstants appearing in the refined inequalities obtaine ...","PeriodicalId":416273,"journal":{"name":"Publications De L'institut Mathematique","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126367503","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Simple groups with the same prime graph as 2Dn(q) 质数图与 2Dn(q)相同的简单群
Publications De L'institut Mathematique Pub Date : 2016-12-18 DOI: 10.2298/PIM150304024K
B. Khosravi, A. Babai
{"title":"Simple groups with the same prime graph as 2Dn(q)","authors":"B. Khosravi, A. Babai","doi":"10.2298/PIM150304024K","DOIUrl":"https://doi.org/10.2298/PIM150304024K","url":null,"abstract":"In 2006, Vasil'ev posed the problem: Does there exist a positive integer k \u0000 such that there are no k pairwise nonisomorphic nonabelian finite simple \u0000 groups with the same graphs of primes? Conjecture: k = 5. In 2013, Zvezdina, \u0000 confirmed the conjecture for the case when one of the groups is alternating. \u0000 We continue this work and determine all nonabelian simple groups having the \u0000 same prime graphs as the nonabelian simple group 2Dn(q).","PeriodicalId":416273,"journal":{"name":"Publications De L'institut Mathematique","volume":"98 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130654361","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
A New Model of Nonlocal Modified Gravity 一个新的非局部修正引力模型
Publications De L'institut Mathematique Pub Date : 2014-11-18 DOI: 10.2298/PIM1308187D
I. Dimitrijevic, B. Dragovich, J. Grujić, Z. Rakić
{"title":"A New Model of Nonlocal Modified Gravity","authors":"I. Dimitrijevic, B. Dragovich, J. Grujić, Z. Rakić","doi":"10.2298/PIM1308187D","DOIUrl":"https://doi.org/10.2298/PIM1308187D","url":null,"abstract":"We consider a new modified gravity model with nonlocal term of the form \u0000 R−1F(□)R. This kind of nonlocality is motivated by investigation of \u0000 applicability of a few unusual ansatze to obtain some exact cosmological \u0000 solutions. In particular, we find attractive and useful quadratic ansatz □R = \u0000 qR2.","PeriodicalId":416273,"journal":{"name":"Publications De L'institut Mathematique","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123088286","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 9
The Schouten-van Kampen affine connection adapted to an almost (para) contact metric structure Schouten-van Kampen仿射连接适用于近(段)接触度量结构
Publications De L'institut Mathematique Pub Date : 2014-02-24 DOI: 10.2298/PIM1308031O
Z. Olszak
{"title":"The Schouten-van Kampen affine connection adapted to an almost (para) contact metric structure","authors":"Z. Olszak","doi":"10.2298/PIM1308031O","DOIUrl":"https://doi.org/10.2298/PIM1308031O","url":null,"abstract":"We study the Schouten-van Kampen connection associated to an almost contact or paracontact metric structure. With the help of such a con- nection, some classes of almost (para) contact metric manifolds are character- ized. Certain curvature properties of this connection are found.","PeriodicalId":416273,"journal":{"name":"Publications De L'institut Mathematique","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132178172","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 43
A double inequality for the combination of Toader mean and the arithmetic mean in terms of the contraharmonic mean 用反调和均值表示Toader均值和算术均值组合的二重不等式
Publications De L'institut Mathematique Pub Date : 2014-02-19 DOI: 10.2298/PIM141026009J
Weidong Jiang, Feng Qi (祁锋)
{"title":"A double inequality for the combination of Toader mean and the arithmetic mean in terms of the contraharmonic mean","authors":"Weidong Jiang, Feng Qi (祁锋)","doi":"10.2298/PIM141026009J","DOIUrl":"https://doi.org/10.2298/PIM141026009J","url":null,"abstract":"We find the greatest value λ and the least value μ such that the double \u0000 inequality C(λa +(1-λ)b, λb + (1-λ)a) < αA(a,b) + (1-α)T(a, b)< \u0000 C(μa + (1-μ)b, μb + (1-μ)a) holds for all α  (0,1) and a, b > 0 with \u0000 a ≠ b, where C(a,b), A(a,b), and T(a,b) denote respectively the \u0000 contraharmonic, arithmetic, and Toader means of two positive numbers a and \u0000 b.","PeriodicalId":416273,"journal":{"name":"Publications De L'institut Mathematique","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122400858","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 7
Minkowski plane, confocal conics, and billiards 闵可夫斯基平面，共焦圆锥和台球
Publications De L'institut Mathematique Pub Date : 2013-12-19 DOI: 10.2298/PIM1308017D
V. Dragović, M. Radnović
{"title":"Minkowski plane, confocal conics, and billiards","authors":"V. Dragović, M. Radnović","doi":"10.2298/PIM1308017D","DOIUrl":"https://doi.org/10.2298/PIM1308017D","url":null,"abstract":"Geometry of confocal conics in the Minkowski plane and related billiard \u0000 dynamics are studied in details. Periodic trajectories are described and \u0000 several new examples are presented. Topological properties of the elliptical \u0000 billiards are analyzed and the results are formulated in the terms of the \u0000 Fomenko graphs. [Projekat Ministarstva nauke Republike Srbije, br. 174020: \u0000 Geometry and Topology of Manifolds and Integrable Dynamical Systems]","PeriodicalId":416273,"journal":{"name":"Publications De L'institut Mathematique","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127536499","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 11
ON LINEAR COMBINATIONS OF CHEBYSHEV POLYNOMIALS 关于切比雪夫多项式的线性组合
Publications De L'institut Mathematique Pub Date : 2013-11-09 DOI: 10.2298/PIM150220001S
Dragan Stankov
{"title":"ON LINEAR COMBINATIONS OF CHEBYSHEV POLYNOMIALS","authors":"Dragan Stankov","doi":"10.2298/PIM150220001S","DOIUrl":"https://doi.org/10.2298/PIM150220001S","url":null,"abstract":"We investigate an infinite sequence of polynomials of the form: a0Tn(x) + a1Tn 1(x) + · · · + amTn m(x) where (a0, a1, . . . , am) is a fixed m-tuple of real numbers, a0, am 6 0, Ti(x) are Chebyshev polynomials of the first kind, n = m, m + 1, m + 2, . . . Here we analyze the structure of the set of zeros of such polynomial, depending on A and its limit points when n tends to infinity. Also the expression of envelope of the polynomial is given. An application in number theory, more precise, in the theory of Pisot and Salem numbers, is presented.","PeriodicalId":416273,"journal":{"name":"Publications De L'institut Mathematique","volume":"415 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126697394","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
MULTIDIMENSIONAL TAUBERIAN THEOREMS FOR VECTOR-VALUED DISTRIBUTIONS 向量值分布的多维陶博定理
Publications De L'institut Mathematique Pub Date : 2013-04-15 DOI: 10.2298/PIM1409001P
S. Pilipovic, J. Vindas
{"title":"MULTIDIMENSIONAL TAUBERIAN THEOREMS FOR VECTOR-VALUED DISTRIBUTIONS","authors":"S. Pilipovic, J. Vindas","doi":"10.2298/PIM1409001P","DOIUrl":"https://doi.org/10.2298/PIM1409001P","url":null,"abstract":"We prove several Tauberian theorems for regularizing transforms of vector-valued distributions. The regularizing transform of f is given by the integral transform M f(x, y) = (f � 'y)(x), (x, y) 2 R n × R+, with ker- nel 'y(t) = y−n'(t/y). We apply our results to the analysis of asymptotic stability for a class of Cauchy problems, Tauberian theorems for the Laplace transform, the comparison of quasiasymptotics in distribution spaces, and we give a necessary and sufficient condition for the existence of the trace of a dis- tribution on {x0} × R m . In addition, we present a new proof of Littlewood's Tauberian theorem.","PeriodicalId":416273,"journal":{"name":"Publications De L'institut Mathematique","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133238541","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 22
Fixed points for Ciric-G-contractions in uniform spaces endowed with a graph 具有图的均匀空间中circ - g收缩的不动点
Publications De L'institut Mathematique Pub Date : 2013-04-05 DOI: 10.2298/PIM140202001A
A. Aghanians, K. Fallahi, K. Nourouzi, R. Verma
{"title":"Fixed points for Ciric-G-contractions in uniform spaces endowed with a graph","authors":"A. Aghanians, K. Fallahi, K. Nourouzi, R. Verma","doi":"10.2298/PIM140202001A","DOIUrl":"https://doi.org/10.2298/PIM140202001A","url":null,"abstract":"We investigate the notion of λ-generalized contractions introduced by Ciric \u0000 in uniform spaces endowed with a graph and discuss on the existence and \u0000 uniqueness of fixed points for this type of contractions using the basic \u0000 entourages.","PeriodicalId":416273,"journal":{"name":"Publications De L'institut Mathematique","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125175522","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
GROUP CLASSIFICATION OF VARIABLE COEFFICIENT QUASILINEAR REACTION-DIFFUSION EQUATIONS 变系数拟线性反应扩散方程的群分类
Publications De L'institut Mathematique Pub Date : 2013-02-20 DOI: 10.2298/PIM1308081V
O. Vaneeva, Alexander Zhalij
{"title":"GROUP CLASSIFICATION OF VARIABLE COEFFICIENT QUASILINEAR REACTION-DIFFUSION EQUATIONS","authors":"O. Vaneeva, Alexander Zhalij","doi":"10.2298/PIM1308081V","DOIUrl":"https://doi.org/10.2298/PIM1308081V","url":null,"abstract":"The group classification of variable coefficient quasilinearreaction- diffusion equations ut = uxx + h(x)B(u) is carried out exhaustively. This became possible due to usage of a conditional equivalence group found in the course of the study of admissible point transformations within the class.","PeriodicalId":416273,"journal":{"name":"Publications De L'institut Mathematique","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134448291","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 9
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