?
Polynomial normal form and finitely smooth equivalence of autonomous systems with one zero eigenvalue
Доклады Академии наук. 2010. Vol. 81. No. 3. P. 351–353.
In a neighborhood of a singular point, we consider autonomous systems of ordinary differential equations for which one eigenvalue of the matrix of the linear part is zero and the remaining eigenvalues do not belong to the imaginary axis. We study the reducibility of such systems to normal form. We prove that the problem of finitely smooth equivalence can be solved for such systems by using finite segments of the Taylor series of their right-hand sides.
Priority areas:
mathematics
Language:
English
Glutsyuk A., / Series arXiv "math". 2026.
B.Josephson (Nobel Prize, 1973) predicted a tunnelling effect for a system of two superconductors separated by a narrow dielectric (such a system is called Josephson junction): existence of a supercurrent through it and equations governing it. The overdamped Josephson junction is modeled by the family of differential equations on the 2-torus, dθdτ=1ω(cosθ+B+Acosτ), which is known as ...
Added: September 8, 2026
Pochinka O., Shmukler V., / Series math.RT "arXiv:1808.06395 [math.RT]". 2026.
Anosov flows have a long and rich history, firstly motivated by the
study of geodesic flows in negative curvature surface by Anosov and Sinai.
Not every closed manifold admits an Anosov flow for well-known reasons:
the fundamental group of a 3-manifold M admitting an Anosov flow must
have exponential growth, and M must be universally covered by R3. Nevertheless,
there ...
Added: August 31, 2026
Loubenets E. R., / Series arxiv.org "quant-ph". 2026. No. 2607.18050.
In many quantum applications it is important to know whether or not a Bell nonlocal two-qudit state exhibits its nonlocality under correlation scenarios with some given numbers S1,S2≥1 of generalized quantum measurements at two sites. In the present article, we find analytically a new general locality condition sufficient for a nonseparable Werner state with a ...
Added: July 21, 2026
Bolbachan V., / Series math "arxiv.org". 2024.
Chow polylogarithms are some special functions arising in explicit description of the Beilinson regulator map. The most interesting functional equation for this function reflects its vanishing on the boundary in the Bloch's cycle complex. We show that this functional equation formally follows from more simple ones, namely skew-symmetry, functoriality and multiplicativity.
To prove this, we study ...
Added: July 16, 2026
Bolbachan V., / Series math "arxiv.org". 2024.
Let K be a field of characteristic zero. We prove that its motivic cohomology in degree m−1 and weight m is rationally isomorphic to the cohomology of the polylogarithmic complex. This gives a partial extension of A. Suslin theorem describing the indecomposable K3 of a field. ...
Added: July 16, 2026
Panov V., Ryabchenko A., / Series arXiv "stat.ME". 2026. No. 2607.05048.
This paper investigates the problem of statistical inference for a mixture distribution consisting of a discrete and a continuous component, with a particular focus on the class of rational-infinitely divisible distributions. We consider non-parametric estimation of both components of the mixture as well as the quasi-L{é}vy measure, assuming that the mixture belongs to the class ...
Added: July 9, 2026
Konakov V., Kucher D., Mammen E., / Series arXiv "math". 2026. No. 2606.11142v1.
In this paper, we construct strong approximations for discrete-time Markov chains weakly converging to continuous diffusion processes, as well as for their perturbed counterparts. Under the assumption of bounded coefficients, we construct closely coupled versions of these processes on a shared probability space. In particular, for both non-degenerate and degenerate cases, we maximize the probability ...
Added: June 11, 2026
Dorovskiy A., / Series arXiv "math". 2026.
In this paper the structural stability of generic families of vector fields of the PC-HC class on the two-dimensional sphere is proved. A classification of these families up to moderate equivalence in neighborhoods of their large bifurcation supports is presented, based on such invariants as the configuration and the characteristic set. The realization lemma is proved. ...
Added: May 14, 2026
Taletskii D., / Series arXiv "math". 2026.
A vertex subset of a graph is called a \textit{distance-$k$ independent set} if the distance between any two of its distinct vertices is at least $k + 1$. For all $n,k \geq 1$, we determine the minimum possible number of inclusion-wise maximal distance-$k$ independent sets among all $n$-vertex trees. It equals~$n$ if $n \leq k ...
Added: May 1, 2026
Ovcharenko M., / Series arXiv "math". 2026.
We introduce an explicit class of tempered Laurent polynomials in the sense of Villegas and Doran--Kerr in n⩽4 variables including all Landau--Ginzburg models for smooth Fano threefolds with very ample anticanonical class. We check that it contains Landau--Ginzburg models for various Fano fourfolds which are complete intersections in smooth toric varieties and Grassmannians of planes, ...
Added: April 30, 2026
Zlotnik Alexander, / Series arXiv "math". 2026. No. 2602.03481v1.
We deal with the global in time weak solutions to the 1D compressible Navier-Stokes system of equations for large discontinuous initial data and nonhomogeneous boundary conditions of three standard types. We prove the Lipschitz-type continuous dependence of the solution $(\eta,u,\theta)$, in a norm slightly stronger than $L^{2,\infty}(Q)\times L^2(Q)\times L^2(Q)$, on the initial data $(\eta^0,u^0,e^0)$ in a ...
Added: April 18, 2026
Medvedev V., / Series arXiv "math". 2026.
We investigate the interplay between the dimension of the space of static potentials and the geometric and topological structure of the underlying static three-manifold. A partial classification of boundaryless static manifolds is obtained in terms of this dimension. We also treat the case of static manifolds with boundary. In particular, we prove that if a ...
Added: April 3, 2026
Gabdullin N., Androsov I., / Series Computer Science "arxiv.org". 2026.
Label prediction in neural networks (NNs) has O(n) complexity proportional to the number of classes. This holds true for classification using fully connected layers and cosine similarity with some set of class prototypes. In this paper we show that if NN latent space (LS) geometry is known and possesses specific properties, label prediction complexity can ...
Added: April 2, 2026
Kolesnikov A., / Series arXiv "math". 2025.
We study Blaschke--Santal{ó}-type inequalities for N>=2 sets (functions) and a special class of cost functions. In particular, we prove new results about reduction of the maximization problem for the Blaschke--Santal{ó}-type functional to homogeneous case (functional inequalities on the sphere) and extend the symmetrization argument to the case of N>2 sets.
We also discuss links to the ...
Added: February 13, 2026
Sorokin K., Beketov M., Онучин А. et al., / arxiv.org. Серия cs.SI "Social and Information Networks ". 2025.
Community detection in complex networks is a fundamental problem, open to new approaches in various scientific settings. We introduce a novel community detection method, based on Ricci flow on graphs. Our technique iteratively updates edge weights (their metric lengths) according to their (combinatorial) Foster version of Ricci curvature computed from effective resistance distance between the ...
Added: January 15, 2026
Gaianov N., Parusnikova A., / Cornell University. Серия math "arxiv.org". 2025.
An algebraic q-difference equation is considered. A sufficient condition for the existence of a formal power-logarithmic expansion of a solution to such an equation in the neighborhood of zero is proposed. An example of applying this sufficient condition for constructing a formal expansion of a solution to a certain q-difference analogue of the fifth Painlevé equation ...
Added: December 25, 2025
Zakirova G., Bulletin of the South Ural State University, Series: Mathematical Modelling, Programming and Computer Software 2019 Vol. 12 No. 2 P. 5–24
The article contains results in the field of spectral problems for mathematical models with discrete semi-bounded operator. The theory is based on linear formulas for calculating the eigenvalues of a discrete operator. The main idea is to reduce spectral problem to the Fredholm integral equation of the first kind. A computationally efficient numerical method for ...
Added: January 23, 2022
Korolev A. V., М.: Юрайт, 2017.
Данный учебник дает читателю необходимые знания по теории обыкновенных дифференциальных уравнений, теории разностных уравнений и теории стохастических дифференциальных уравнений. Все три названные раздела одинаково необходимы для полноценного экономического образования. Учебник состоит из теоретической и практической частей. В практической части курса подробно и обстоятельно демонстрируются на конкретных примерах методы решения различных задач. В результате изучения данного ...
Added: August 9, 2017
AAMAS'16: Proceedings of the 2016 International Conference on Autonomous Agents & Multiagent Systems
Richland: International Foundation for Autonomous Agents and Multiagent Systems, 2016.
The Autonomous Agents and MultiAgent Systems (AAMAS) conference series brings together researchers from around the world to share the latest advances in the field. It is the premier forum for research in the theory and practice of autonomous agents and multi-agent systems. AAMAS 2002, the first of the series, was held in Bologna, followed by ...
Added: May 19, 2016
Kravchenko N., Mukhin S., В кн.: II Всероссийская объединённая научная конференция "Проблемы СВЧ-электроники" МИЭМ НИУ ВШЭ – "Инновационные решения" Keysight Technologies. Сборник трудов конференции.: М.: ИД Медиа Паблишер, 2015. С. 33–36.
Предметом рассмотрения данного доклада является разработка алгоритма и программы расчета дисперси- онных характеристик резонаторных замедляющих систем с использованием результатов их трехмерного мо- делирования в HFSS. Трехмерное моделирование замедляющих систем не позволяет вычислить их дисперсион- ные характеристики, оно лишь предоставляет некоторые исходные данные, которые требуют дальнейшее обработки, которую и осуществляет рассматриваемая программа. Для расчета необходимо получить ...
Added: November 16, 2015
Vyugin I. V., Gontsov R. R., Arnold Mathematical Journal 2015 Vol. 1 No. 4 P. 445–471
The paper conserns the solvability by quadratures of linear differential systems, which is one of the questions of differential Galois theory. We consider systems with regular singular points as well as those with non-resonant irregular ones and propose some criteria of solvability for systems whose exponents (respectively, so-called formal exponents in the irregular case) are ...
Added: June 22, 2015
Kuznetsov V. V., Кузнецова Н. А., Известия Московского государственного технического университета МАМИ 2013 Т. 2 № 3 С. 130–138
В статье рассматривается возможность применения асимптотического метода Вентцеля - Крамерса - Бриллюэна (ВКБ) решения обыкновенных дифференциальных уравнений, с малым параметром при старшей производной, для построения и оценки решений одного класса вырождающихся обыкновенных дифференциальных уравнений второго порядка, содержащих большой числовой параметр. ...
Added: May 12, 2014
Kuznetsov V. V., Кузнецова Н. А., Ученые записки Российского государственного социального университета 2013 Т. 2 № 5 С. 26–29
В статье исследуется дифференциальное уравнение второго порядка, содержащее большой числовой параметр, доказано существование двух линейно независимых решений, получены асимптотические представления решений и их производных первого порядка. ...
Added: May 12, 2014
Kuznetsov V. V., Кузнецова Н. А., В кн.: Математические методы в технике и технологиях - ММТТ-26: сборник трудов XXVI Международной научной конференцииТ. 1.: Н. Новгород: Нижегородский государственный технический университет им. Р.Е. Алексеева, 2013. С. 29–30.
Статья посвящена возможности использования асимптотического метода ВКБ для исследования вырождающегося дифференциального уравнения второго порядка, содержащего большой числовой параметр, получены асимптотические представления решений и их производных первого порядка. ...
Added: November 11, 2013