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Izvestiya of Saratov University Mathematics Mechanics Informatics最新文献

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Distance between strongly and weakly convex sets 强和弱凸集之间的距离
IF 0.2
Izvestiya of Saratov University Mathematics Mechanics Informatics Pub Date : 2021-11-22 DOI: 10.18500/1816-9791-2021-21-4-434-441
S. Dudov, M. Osiptsev
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引用次数: 0
Harmonic analysis of functions almost periodic at infinity in Banach modules Banach模中无穷远几乎周期函数的调和分析
IF 0.2
Izvestiya of Saratov University Mathematics Mechanics Informatics Pub Date : 2021-11-22 DOI: 10.18500/1816-9791-2021-21-4-448-457
I. Strukova
{"title":"Harmonic analysis of functions almost periodic at infinity in Banach modules","authors":"I. Strukova","doi":"10.18500/1816-9791-2021-21-4-448-457","DOIUrl":"https://doi.org/10.18500/1816-9791-2021-21-4-448-457","url":null,"abstract":"","PeriodicalId":42789,"journal":{"name":"Izvestiya of Saratov University Mathematics Mechanics Informatics","volume":"8 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2021-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89208296","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
Study of the mechanical properties of carbon molecular structures in the form of multilayer graphene with vertically oriented carbon nanotubes 研究了垂直取向碳纳米管的多层石墨烯碳分子结构的力学性能
IF 0.2
Izvestiya of Saratov University Mathematics Mechanics Informatics Pub Date : 2021-11-22 DOI: 10.18500/1816-9791-2021-21-4-489-502
A. Kolesnikova
{"title":"Study of the mechanical properties of carbon molecular structures in the form of multilayer graphene with vertically oriented carbon nanotubes","authors":"A. Kolesnikova","doi":"10.18500/1816-9791-2021-21-4-489-502","DOIUrl":"https://doi.org/10.18500/1816-9791-2021-21-4-489-502","url":null,"abstract":"","PeriodicalId":42789,"journal":{"name":"Izvestiya of Saratov University Mathematics Mechanics Informatics","volume":"8 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2021-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72765030","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
Modeling the reliability of the onboard equipment of a mobile robot 移动机器人机载设备可靠性建模
IF 0.2
Izvestiya of Saratov University Mathematics Mechanics Informatics Pub Date : 2021-08-25 DOI: 10.18500/1816-9791-2021-21-3-390-399
E. V. Larkin, T. Akimenko, A. Bogomolov
{"title":"Modeling the reliability of the onboard equipment of a mobile robot","authors":"E. V. Larkin, T. Akimenko, A. Bogomolov","doi":"10.18500/1816-9791-2021-21-3-390-399","DOIUrl":"https://doi.org/10.18500/1816-9791-2021-21-3-390-399","url":null,"abstract":"","PeriodicalId":42789,"journal":{"name":"Izvestiya of Saratov University Mathematics Mechanics Informatics","volume":"3 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2021-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78596794","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
The search for minimal edge 1-extension of an undirected colored graph 无向有色图的最小边1扩展的搜索
IF 0.2
Izvestiya of Saratov University Mathematics Mechanics Informatics Pub Date : 2021-08-25 DOI: 10.18500/1816-9791-2021-21-3-400-407
P. V. Razumovsky
{"title":"The search for minimal edge 1-extension of an undirected colored graph","authors":"P. V. Razumovsky","doi":"10.18500/1816-9791-2021-21-3-400-407","DOIUrl":"https://doi.org/10.18500/1816-9791-2021-21-3-400-407","url":null,"abstract":"","PeriodicalId":42789,"journal":{"name":"Izvestiya of Saratov University Mathematics Mechanics Informatics","volume":"4 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2021-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75161266","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
Waves in a viscoelastic cylindrical waveguide with a defect 带有缺陷的粘弹性圆柱波导中的波
IF 0.2
Izvestiya of Saratov University Mathematics Mechanics Informatics Pub Date : 2021-08-25 DOI: 10.18500/1816-9791-2021-21-3-352-367
A. Vatulyan, V. Yurov
{"title":"Waves in a viscoelastic cylindrical waveguide with a defect","authors":"A. Vatulyan, V. Yurov","doi":"10.18500/1816-9791-2021-21-3-352-367","DOIUrl":"https://doi.org/10.18500/1816-9791-2021-21-3-352-367","url":null,"abstract":"","PeriodicalId":42789,"journal":{"name":"Izvestiya of Saratov University Mathematics Mechanics Informatics","volume":"1 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2021-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89547249","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
Analytic embedding of pseudo-Helmholtz geometry 伪亥姆霍兹几何的解析嵌入
IF 0.2
Izvestiya of Saratov University Mathematics Mechanics Informatics Pub Date : 2021-08-25 DOI: 10.18500/1816-9791-2021-21-3-294-304
V. Kyrov
{"title":"Analytic embedding of pseudo-Helmholtz geometry","authors":"V. Kyrov","doi":"10.18500/1816-9791-2021-21-3-294-304","DOIUrl":"https://doi.org/10.18500/1816-9791-2021-21-3-294-304","url":null,"abstract":"","PeriodicalId":42789,"journal":{"name":"Izvestiya of Saratov University Mathematics Mechanics Informatics","volume":"360 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2021-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82638423","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
On the convergence of the order-preserving weak greedy algorithm for subspaces generated by the Szego kernel in the Hardy space Hardy空间中Szego核生成子空间的保序弱贪婪算法的收敛性
IF 0.2
Izvestiya of Saratov University Mathematics Mechanics Informatics Pub Date : 2021-08-25 DOI: 10.18500/1816-9791-2021-21-3-336-342
K. S. Speransky
{"title":"On the convergence of the order-preserving weak greedy algorithm for subspaces generated by the Szego kernel in the Hardy space","authors":"K. S. Speransky","doi":"10.18500/1816-9791-2021-21-3-336-342","DOIUrl":"https://doi.org/10.18500/1816-9791-2021-21-3-336-342","url":null,"abstract":"","PeriodicalId":42789,"journal":{"name":"Izvestiya of Saratov University Mathematics Mechanics Informatics","volume":"9 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2021-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87012718","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
Non-reductive spaces with equiaffine connections of nonzero curvature 具有非零曲率等仿射连接的非约化空间
IF 0.2
Izvestiya of Saratov University Mathematics Mechanics Informatics Pub Date : 2021-08-25 DOI: 10.18500/1816-9791-2021-21-3-305-316
N. Mozhey
{"title":"Non-reductive spaces with equiaffine connections of nonzero curvature","authors":"N. Mozhey","doi":"10.18500/1816-9791-2021-21-3-305-316","DOIUrl":"https://doi.org/10.18500/1816-9791-2021-21-3-305-316","url":null,"abstract":". The introduction of this article states the object of our investigation which is structures on homogeneous spaces. The problem of establishing links between the curvature and the structure of a manifold is one of the important problems of geometry. In general, the research of manifolds of various types is rather complicated. Therefore, it is natural to consider this problem in a narrower class of non-reductive homogeneous spaces. If a homogeneous space is reductive, then the space admits an invariant connection. If there exists at least one invariant connection, then the space is isotropy-faithful. This work studies three-dimensional non-reductive homogeneous spaces that admit invariant affine connections of nonzero curvature only. The basic notions, such as an isotropically-faithful pair, an (invariant) affine connection, curvature and torsion tensors, Ricci tensor, an equiaffine (locally equiaffine) connection, and a reductive space are defined. The purpose of this work is the description of equiaffine (locally equiaffine) connections on such spaces. In the main part of this paper, for three-dimensional non-reductive homogeneous spaces (that admit invariant connections of nonzero curvature only) equiaffine (locally equiaffine) connections are found and written out in explicit form. The features of the methods presented in the work is the application of a purely algebraic approach to the description of manifolds and structures on them. In the conclusion, the results obtained in the work are indicated. The results can be used in works on differential geometry, differential equations, topology, as well as in other areas of mathematics and physics. The algorithms for finding connections can be computerized and used for the solution of similar problems in large dimensions.","PeriodicalId":42789,"journal":{"name":"Izvestiya of Saratov University Mathematics Mechanics Informatics","volume":"22 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2021-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84261945","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
The key exchange protocol based on non-commutative elements of Clifford algebra 基于Clifford代数非交换元的密钥交换协议
IF 0.2
Izvestiya of Saratov University Mathematics Mechanics Informatics Pub Date : 2021-08-25 DOI: 10.18500/1816-9791-2021-21-3-408-418
S. N. Chukanov
{"title":"The key exchange protocol based on non-commutative elements of Clifford algebra","authors":"S. N. Chukanov","doi":"10.18500/1816-9791-2021-21-3-408-418","DOIUrl":"https://doi.org/10.18500/1816-9791-2021-21-3-408-418","url":null,"abstract":"","PeriodicalId":42789,"journal":{"name":"Izvestiya of Saratov University Mathematics Mechanics Informatics","volume":"67 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2021-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76698368","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
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