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Mixed Problems in a Lipschitz Domain for Strongly Elliptic Second-Order Systems
Functional Analysis and Its Applications. 2011. Vol. 45. No. 2. P. 81–98.
Agranovich M. S.
We consider mixed problems for strongly elliptic second-order systems in a bounded domain with Lipschitz boundary in the space Rn. For such problems, equivalent equations on the boundary in the simplest L2-spaces Hs of Sobolev type are derived, which permits one to represent the solutions via surface potentials. We prove a result on the regularity of solutions in the slightly more general spaces Hsp of Bessel potentials and Besov spaces Bsp. Problems with spectral parameter in the system or in the condition on a part of the boundary are considered, and the spectral properties of the corresponding operators, including the eigenvalue asymptotics, are discussed.
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
Agranovich M. S., Memoirs on Differential Equations and Mathematical Physics 2015 Vol. 65 P. 11–21
This paper contains a short presentation of author’s results on spectral properties of main boundary value problems for strongly elliptic second-order systems in bounded Lipschitz domains. We consider the questions on the completeness of root functions, on the summability of Fourier series with respect to them and on their basis property in spaces Hsp with ...
Added: September 8, 2015
Толченников А. А., В.Л. Чернышев, Шафаревич А. И., Наноструктуры. Математическая физика и моделирование 2014 Т. 11 № 2 С. 75–104
Уравнения Шрёдингера на геометрических графах изучаются, начиная с 30-х годов прошлого века; изначально они использовались в модели свободных электронов в органических молекулах. В последние тридцать лет теория дифференциальных уравнений на графах активно развивается в различных направлениях; одно из них --- обобщение уравнений Шрёдингера на так называемые декорированные графы --- пространства, получаемые из графов заменой вершин ...
Added: December 8, 2014
Agranovich M. S., Селицкий А. М., Функциональный анализ и его приложения 2013 Т. 47 № 2 С. 2–17
Пусть \omega — ограниченная липшицева область в R^n и пусть в ней задан матричный сильно эллиптический оператор 2-го порядка, записанный в дивергентной форме. Обширная литература посвящена изучению областей определения дробных степеней операторов, отвечающих задачам для уравнения , прежде всего Дирихле и Неймана, c однородными граничными условиями, включая решение проблемы Като, возникшей в 1961 г. Охвачены ...
Added: August 30, 2013
Agranovich M. S., Functional Analysis and Its Applications 2011 Vol. 45 No. 1 P. 1–12
We consider boundary value problems and transmission problems for strongly elliptic second-order systems with boundary conditions on a compact nonclosed Lipschitz surface S with Lipschitz boundary. The main goal is to find conditions for the unique solvability of these problems in the spaces Hs , the simplest L2-spaces of the Sobolev type, with the use ...
Added: April 12, 2012
Agranovich M. S., Современная математика. Фундаментальные направления 2011 Т. 39 С. 11–45
Статья посвящена спектральным задачам для сильно эллиптических систем 2-го порядка в ограниченных липшицевых областях. Рассматриваются спектральные задачи Дирихле и Неймана, а также три задачи со спектральным параметром в условиях на границе: задача Пуанкаре-Стеклова
и две задачи сопряжения. В порядке обзора обсуждаются основные свойства этих задач, самосопряженных и несамосопряженных. Предварительно объясняется ряд фактов общей теории основных задач ...
Added: April 12, 2012
Agranovich M. S., Функциональный анализ и его приложения 2011 Т. 45 № 2 С. 1–22
Рассматриваются смешанные задачи для сильно эллиптических систем 2-го порядка в ограниченной области пространства Rn с липшицевой границей. Выводятся уравнения на границе, эквивалентные задаче, в простейших L2-пространствах Hs типа Соболева, что позволяет представить решения через поверхностные потенциалы. Доказывается результат о регулярности решений с выходом в немного более общие
пространства Hsp бесселевых потенциалов и пространства Bsp
Бесова. Рассматриваются задачи ...
Added: April 12, 2012
Agranovich M. S., Функциональный анализ и его приложения 2011 Т. 45 № 1 С. 1–15
Рассматриваются граничные задачи и задачи сопряжения для сильно эллиптических систем 2-го порядка с граничными условиями на компактной незамкнутой липшицевой поверхности S с липшицевым краем. Основная цель - выяснение условий однозначной разрешимости этих задач в пространствах Hs - простейших L2 -пространствах типа Соболева - с использованием операторов типа потенциала на S. Обсуждаются вопросы о регулярности решений ...
Added: April 12, 2012