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Acta et Commentationes Universitatis Tartuensis de Mathematica最新文献

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Second approximation of local functions in ideal topological spaces 理想拓扑空间中局部函数的二次逼近
IF 0.3
Acta et Commentationes Universitatis Tartuensis de Mathematica Pub Date : 2019-01-02 DOI: 10.12697/ACUTM.2018.22.20
Md. Monirul Islam, S. Modak
{"title":"Second approximation of local functions in ideal topological spaces","authors":"Md. Monirul Islam, S. Modak","doi":"10.12697/ACUTM.2018.22.20","DOIUrl":"https://doi.org/10.12697/ACUTM.2018.22.20","url":null,"abstract":"This paper gives a new dimension to discuss the local function in ideal topological spaces. We calculate error operators for various type of local functions and introduce more perfect approximation of the local functions for discussing their properties. We have also reached a topological space with the help of semi-closure.","PeriodicalId":42426,"journal":{"name":"Acta et Commentationes Universitatis Tartuensis de Mathematica","volume":"20 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2019-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78489534","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
Extremal tricyclic, tetracyclic, and pentacyclic graphs with respect to the Narumi–Katayama index 关于Narumi-Katayama指数的极值三环、四环和五环图
IF 0.3
Acta et Commentationes Universitatis Tartuensis de Mathematica Pub Date : 2019-01-02 DOI: 10.12697/ACUTM.2018.22.22
A. Ashrafi, M. Eliasi, A. Ghalavand, O. Ori
{"title":"Extremal tricyclic, tetracyclic, and pentacyclic graphs with respect to the Narumi–Katayama index","authors":"A. Ashrafi, M. Eliasi, A. Ghalavand, O. Ori","doi":"10.12697/ACUTM.2018.22.22","DOIUrl":"https://doi.org/10.12697/ACUTM.2018.22.22","url":null,"abstract":"<jats:p>See PDF</jats:p>","PeriodicalId":42426,"journal":{"name":"Acta et Commentationes Universitatis Tartuensis de Mathematica","volume":"303 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2019-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74541898","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
Boundedness of the L-index in a direction of entire solutions of second order partial differential equation 二阶偏微分方程全解方向上l指标的有界性
IF 0.3
Acta et Commentationes Universitatis Tartuensis de Mathematica Pub Date : 2019-01-02 DOI: 10.12697/ACUTM.2018.22.18
Andriy Ivanovych Bandura, O. Skaskiv
{"title":"Boundedness of the L-index in a direction of entire solutions of second order partial differential equation","authors":"Andriy Ivanovych Bandura, O. Skaskiv","doi":"10.12697/ACUTM.2018.22.18","DOIUrl":"https://doi.org/10.12697/ACUTM.2018.22.18","url":null,"abstract":"<jats:p>See PDF</jats:p>","PeriodicalId":42426,"journal":{"name":"Acta et Commentationes Universitatis Tartuensis de Mathematica","volume":"34 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2019-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89637585","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
Asymptotics of approximation of conjugate functions by Poisson integrals 用泊松积分逼近共轭函数的渐近性
IF 0.3
Acta et Commentationes Universitatis Tartuensis de Mathematica Pub Date : 2019-01-02 DOI: 10.12697/ACUTM.2018.22.19
Yu. I. Kharkevych, K. Pozharska
{"title":"Asymptotics of approximation of conjugate functions by Poisson integrals","authors":"Yu. I. Kharkevych, K. Pozharska","doi":"10.12697/ACUTM.2018.22.19","DOIUrl":"https://doi.org/10.12697/ACUTM.2018.22.19","url":null,"abstract":"We obtain a decomposition of the upper bound for the deviation of Poisson integrals of conjugate periodic functions. The decomposition enables one to provide the Kolmogorov–Nikol'skii constants of an arbitrary order.","PeriodicalId":42426,"journal":{"name":"Acta et Commentationes Universitatis Tartuensis de Mathematica","volume":"169 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2019-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88285915","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: 27
On new extensions of the generalized Hermite matrix polynomials 广义Hermite矩阵多项式的新扩展
IF 0.3
Acta et Commentationes Universitatis Tartuensis de Mathematica Pub Date : 2019-01-02 DOI: 10.12697/ACUTM.2018.22.17
A. Shehata
{"title":"On new extensions of the generalized Hermite matrix polynomials","authors":"A. Shehata","doi":"10.12697/ACUTM.2018.22.17","DOIUrl":"https://doi.org/10.12697/ACUTM.2018.22.17","url":null,"abstract":"Various families of generating matrix functions have been established in diverse ways. The objective of the present paper is to investigate these generalized Hermite matrix polynomials, and derive some important results for them, such as, the generating matrix functions, matrix recurrence relations, an expansion of xnI, finite summation formulas, addition theorems, integral representations, fractional calculus operators, and certain other implicit summation formulae.","PeriodicalId":42426,"journal":{"name":"Acta et Commentationes Universitatis Tartuensis de Mathematica","volume":"1 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2019-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74437477","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
On a class of N(k)-mixed generalized quasi-Einstein manifolds 一类N(k)-混合广义拟爱因斯坦流形
IF 0.3
Acta et Commentationes Universitatis Tartuensis de Mathematica Pub Date : 2019-01-02 DOI: 10.12697/ACUTM.2018.22.14
A. Bhattacharyya, S. Pahan
{"title":"On a class of N(k)-mixed generalized quasi-Einstein manifolds","authors":"A. Bhattacharyya, S. Pahan","doi":"10.12697/ACUTM.2018.22.14","DOIUrl":"https://doi.org/10.12697/ACUTM.2018.22.14","url":null,"abstract":"The objective of the present paper is to study N(k)-mixed generalized quasi-Einstein manifolds. We prove the existence of these manifolds. Later we establish some curvature properties of N(k)-mixed generalized quasi-Einstein manifolds under certain conditions. In the last section, we give two examples of N(k)-mixed generalized quasi-Einstein manifolds.","PeriodicalId":42426,"journal":{"name":"Acta et Commentationes Universitatis Tartuensis de Mathematica","volume":"32 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2019-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85405833","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
Matrix transformations related to I-convergent sequences 与i收敛序列相关的矩阵变换
IF 0.3
Acta et Commentationes Universitatis Tartuensis de Mathematica Pub Date : 2019-01-02 DOI: 10.12697/ACUTM.2018.22.16
E. Kolk
{"title":"Matrix transformations related to I-convergent sequences","authors":"E. Kolk","doi":"10.12697/ACUTM.2018.22.16","DOIUrl":"https://doi.org/10.12697/ACUTM.2018.22.16","url":null,"abstract":"Characterized are matrix transformations related to certain subsets of the space of ideal convergent sequences. Obtained here results are connected with the previous investigations of the author on some transformations defined by infinite matrices of bounded linear operators.","PeriodicalId":42426,"journal":{"name":"Acta et Commentationes Universitatis Tartuensis de Mathematica","volume":"230 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2019-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74681350","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
On sound ranging in proper metric spaces 论适当度量空间中的声音范围
IF 0.3
Acta et Commentationes Universitatis Tartuensis de Mathematica Pub Date : 2018-08-09 DOI: 10.12697/ACUTM.2020.24.14
S. V. Goncharov
{"title":"On sound ranging in proper metric spaces","authors":"S. V. Goncharov","doi":"10.12697/ACUTM.2020.24.14","DOIUrl":"https://doi.org/10.12697/ACUTM.2020.24.14","url":null,"abstract":"We consider the sound ranging, or source localization, problem -- find the source-point from the moments when the wave-sphere of linearly, with time, increasing radius reaches the sensor-points -- in proper metric spaces (any closed ball is compact) and, in particular, in the finite-dimensional normed spaces. We approximate the solution to arbitrary precision by the iterative process with the stopping criterion. Implementation of the proposed method in Julia language is included. ","PeriodicalId":42426,"journal":{"name":"Acta et Commentationes Universitatis Tartuensis de Mathematica","volume":"49 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2018-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72921903","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: 2
On Lucas-balancing zeta function 关于Lucas-balancing zeta函数
IF 0.3
Acta et Commentationes Universitatis Tartuensis de Mathematica Pub Date : 2018-06-10 DOI: 10.12697/ACUTM.2018.22.07
Debismita Behera, Utkal Keshari Dutta, P. Ray
{"title":"On Lucas-balancing zeta function","authors":"Debismita Behera, Utkal Keshari Dutta, P. Ray","doi":"10.12697/ACUTM.2018.22.07","DOIUrl":"https://doi.org/10.12697/ACUTM.2018.22.07","url":null,"abstract":"In the present study a new modication of Riemann zeta function known as Lucas-balancing zeta function is introduced. The Lucas-balancing zeta function admits its analytic continuation over the whole complex plane except its poles. This series converges to a fixed rational number − ½ at negative odd integers. Further, in accordance to Dirichlet L-function, the analytic continuation of Lucas-balancing L-function is also discussed.","PeriodicalId":42426,"journal":{"name":"Acta et Commentationes Universitatis Tartuensis de Mathematica","volume":"57 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2018-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72693497","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
On a class of vector-valued entire Dirichlet series in n variables 一类有n个变量的向量值狄利克雷级数
IF 0.3
Acta et Commentationes Universitatis Tartuensis de Mathematica Pub Date : 2018-06-10 DOI: 10.12697/ACUTM.2018.22.01
L. Chutani, Niraj Kumar, Garima Manocha
{"title":"On a class of vector-valued entire Dirichlet series in n variables","authors":"L. Chutani, Niraj Kumar, Garima Manocha","doi":"10.12697/ACUTM.2018.22.01","DOIUrl":"https://doi.org/10.12697/ACUTM.2018.22.01","url":null,"abstract":"We consider a class F of entire Dirichlet series in n variables, whose coefficients belong to a commutative Banach algebra E. With a well defined norm, F is proved to be a Banach algebra with identity. Further results on quasi-invertibility, spectrum and continuous linear functionals are proved for elements belonging to F.","PeriodicalId":42426,"journal":{"name":"Acta et Commentationes Universitatis Tartuensis de Mathematica","volume":"104 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2018-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75403130","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
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