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Action of a Graph Automorphism on the Space of Flows
Mathematical notes. 2019. Vol. 106. No. 1-2. P. 146 – 150.
Spiridonov I.
Artamkin I., / Series arXiv "math". 2023.
A collection of vectors in a real vector space is called a unimodular system if any of its maximal linearly independent subsets generates the same free abelian group. This notion is closely connected with totally unimodular matrices: rows or columns of a totally unimodular matrix form a unimodular system and the matrix of coefficients of ...
Added: November 1, 2025
Вавилов В. В., Ustinov A., Квант 2006 № 6 С. 10–14
The article is devoted to problems related to possible arrangements of circles on plane lattices. ...
Added: October 12, 2025
Вавилов В. В., Ustinov A., Математическое образование 2006 № 4 С. 47–67
We continue publishing educational materials from the Specialized Educational and Scientific Center of Moscow State University (formerly Physics and Mathematics School No. 18). We offer three chapters from the brochure "Problems on Gridded Paper" by Specialized Educational and Scientific Center instructors V. V. Vavilov and A. V. Ustinov. The rest of the manual will be ...
Added: October 12, 2025
Ustinov A., Дальневосточный математический журнал 2011 Т. 11 № 2 С. 213–221
Voronoi's algorithm for computing a system of fundamental units of a complex number field is based on a geometric properties of 3-dimensional lattices. This algorithm is based on Voronoi's theorem about cylindric minima for a lattice in general position. In the original proof and it's refinement published by Delone and Faddeev some significant cases were ...
Added: October 9, 2025
Polyakov N. L., Доклады Российской академии наук. Математика, информатика, процессы управления (ранее - Доклады Академии Наук. Математика) 2025 Т. 522 № 1 С. 40–49
The paper describes a new method for constructing graphs without triangles and with an arbitrarily large chromatic number. The properties of various types of ultrafilter extensions of functions and predicates are used to justify the method. ...
Added: June 3, 2025
Кочкаров А. А., Yatskin D., Кочкаров Р. А., Управленческие науки 2020 Т. 10 № 1 С. 102–111
An important parameter of the transport and logistics task is the structural stability of the system to external influences. In modern literature, the concept of structural stability is defined in its own way for each individual task, as a result of which there are difficulties in applying the developed methods to new problems. The transport ...
Added: March 7, 2025
Кочкаров А. А., Yatskin D., Кочкаров Р. А., Теоретическая и прикладная экономика 2020 № 1 С. 1–9
This article is dedicated to designing of the transport and logistics systems with built-in resistance to structural failures. The sustainability indicators reflect the impact of the failure of one or several hubs (communication channels) upon working capacity of the already functioning system. In the process of designing the system, the sustainability indicators also provide opportunities ...
Added: March 7, 2025
Veryovkin Y., Рахматуллаев Т. А., Математические заметки 2024 Т. 116 № 1 С. 10–33
We study the lower central series of a right-angled Coxeter group RCK and the corresponding associated graded Lie algebra L(RCK) and describe the basis of the fourth graded component of L(RCK) for any K. ...
Added: January 15, 2025
E. A. Morozov, Siberian Electronic Mathematical Reports 2020 Vol. 17 No. n/a P. 1580–1587
We consider an interesting class of combinatorial symmetries of polytopes which we call edge-length preserving combinatorial symmetries. These symmetries not only preserve the combinatorial structure of a polytope but also map each edge of the polytope to an edge of the same length. We prove a simple sucient condition for a polytope to realize all ...
Added: September 27, 2024
Нурлигареев Х. Д., Ярославский педагогический вестник 2011 Т. 3 № 3 С. 15–18
В настоящей статье дано описание полуправильных (равносторонних и равноугольных) многоугольников, которые могут быть расположены на каждом из 11 правильных паркетов. Приведены основные идеи и ключевые моменты доказательств, также статья снабжена большим количеством иллюстраций. ...
Added: October 4, 2022
Нурлигареев Х. Д., Ярославский педагогический вестник 2010 Т. 3 № 4 С. 12–17
Данная статья посвящена вопросам дискретной геометрии, которые традиционно излагаются в курсе математики школы имени А.Н. Колмогорова СУНЦ МГУ. Рассматривается понятие решетки и основные ее свойства, исследуется вопрос о правильных многоугольниках, вершины которых имеют целочисленные координаты, разбирается формула Пика. Теоретическую часть сопровождают задачи, предлагаемые школьникам на практических занятиях. ...
Added: October 4, 2022
Rumynin D., Hristova K., Capdeboscq I., Sbornik Mathematics 2020 Vol. 211 No. 8 P. 1065–1079
We initiate an investigation of lattices in a new class of locally compact groups: so-called locally pro-p-complete Kac-Moody groups. We discover that in rank 2 their cocompact lattices are particularly well-behaved: under mild assumptions, a cocompact lattice in this completion contains no elements of order p. This statement is still an open question for the Caprace-Rémy-Ronan completion. Using this, ...
Added: September 7, 2021
Springer, 2021.
This book constitutes the proceedings of the 16th International Conference on Formal Concept Analysis, ICFCA 2021, held in Strasbourg, France, in June/July 2021.
The 14 full papers and 5 short papers presented in this volume were carefully reviewed and selected from 32 submissions. The book also contains four invited contributions in full paper length.
The research part ...
Added: July 10, 2021
Aleskerov F. T., Khabina E. L., Shvarts D. et al., М.: Юрайт, 2021.
Мы часто принимаем решения не единолично, а в коллективе, с учетом мнений и предпочтений всех членов коллектива: в задачах голосования, распределения работников по работам или студентов по курсам, в задачах дележа наследства или общего имущества, в распределении мест в парламенте после выборов и оценке влияния участников в выборном органе, в задачах оценки эффективности работы в ...
Added: November 29, 2020
Dobrynin A., Vesnin A., Mathematics 2019 Vol. 7 No. 11 P. 1–17
Fullerenes are molecules that can be presented in the form of cage-like polyhedra, consisting only of carbon atoms. Fullerene graphs are mathematical models of fullerene molecules. The transmission of a vertex v of a graph is a local graph invariant defined as the sum of distances from v to all the other vertices. The number ...
Added: October 27, 2020
Zhuk D., Journal of Multiple-Valued Logic and Soft Computing 2015 Vol. 24 No. 1-4 P. 251–316
The lattice of all clones of self-dual functions in three-valued logic is described in the paper. Even though this lattice contains a continuum of clones, a simple description was found. Using this description different properties of the lattice and of the clones were derived. Pair wise inclusion of the clones into each other was described, ...
Added: June 15, 2020