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Structure of the Particle Population for a Branching Random Walk with a Critical Reproduction Law
Methodology and Computing in Applied Probability. 2021. Vol. 23. No. 3. P. 85–102.
Balashova D., Molchanov S., Yarovaya E.
We consider a continuous-time symmetric branching random walk on the d-dimensional lattice, d ≥ 1, and assume that at the initial moment there is one particle at every lattice point. Moreover, we assume that the underlying random walk has a finite variance of jumps and the reproduction law is described by a continuous-time Markov branching process (a continuous-time analog of a Bienamye-Galton-Watson process) at every lattice point. We study the structure of the particle subpopulation generated by the initial particle situated at a lattice point x. We replay why vanishing of the majority of subpopulations does not affect the convergence to the steady state and leads to clusterization for lattice dimensions d = 1 and d = 2.
Жакупов О. Б., European Journal of Mathematics 2025 Vol. 11 Article 84
We provide examples of smooth three-dimensional Fano complete intersections of degree 2, 4, 6, and 8 that have absolute coregularity 0. Considering the main theorem of Avilov, Loginov, and Przyjalkowski (CNTP 18:506–577, 2024) on the remaining 101 families of smooth Fano threefolds, our result implies that each family of smooth Fano threefolds has an element of absolute ...
Added: May 18, 2026
Lerman L. M., Turaev D. V., Regular and Chaotic Dynamics 2026 Vol. 31 No. 3 P. 349–369
We show that bifurcations of four-dimensional symplectic diffeomorphisms with a quadratic homoclinic tangency to a saddle periodic orbit with real multipliers produce 2-elliptic periodic orbits if the tangency is not partially hyperbolic. We show that a normal form for the rescaled first-return maps near such tangency is given by a four-dimensional symplectic H´enonlike map and study bifurcations of the ...
Added: May 15, 2026
Aleskerov F. T., Yakuba V. I., Khutorskaya O. et al., Springer, 2026.
The book contains new models of bibliometric analysis based on centrality measures in network analysis, pattern analysis and stability analysis. A distinctive feature of these centrality measures is that they account for the parameters of vertices and group influence of vertices to a vertex. This reveals specific groups of publications, authors, terms, journals and affiliations ...
Added: May 15, 2026
Kuptsov P., Panyushev A., Stankevich N., Chaos 2026 Vol. 36 No. 5 Article 053138
We develop a machine-learning approach to reproduce the behavior of two versions of the van der Pol oscillator exhibiting a subcritical Andronov–Hopf bifurcation, with or without a codimension-2 Bautin point. We construct a neural-network model that functions as a recur rent map and train it on short segments of oscillator trajectories. The results show that, ...
Added: May 15, 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
Lebedev V., Journal of Mathematical Analysis and Applications 2026 Vol. 563 No. 2 Article 130787
It is known that for every continuous real-valued
function $f$ on the circle $\mathbb T=\mathbb R/2\pi\mathbb Z$ there exists a
change of variable, i.e., a self-homeomorphism $h$ of $\mathbb T$, such that
the superposition $f\circ h$ is in the Sobolev space $W_2^{1/2}(\mathbb T)$.
We obtain new results on simultaneous improvement of functions by a single
change of variable in relation ...
Added: May 14, 2026
Blokh A., Oversteegen L., Selinger N. et al., Arnold Mathematical Journal 2025 Vol. 12 No. 1 P. 1–40
We describe a model for the boundary of the connectedness locus of the parameter space of cubic symmetric polynomials. We show that there exists a monotone continuous function from the connectedness locus to the model which is a homeomorphism if the former is locally connected. ...
Added: May 13, 2026
Petrov I., Автоматика и телемеханика 2026 № 6 С. 82–118
Системам связанных агентов и сетевому управлению посвящено большое число отечественных и зарубежных исследований. Исторически, наибольший интерес в теории управления возникал к усредняющим системам и, в частности, к задаче консенсуса. Однако сетевое взаимодействие может характеризоваться более специфическими функциями, отражающими зависимость от действий соседей по сети, что особенно явно проявляется в моделях стратегического взаимодействия на сети, которое ...
Added: May 12, 2026
М.: ООО «Макс Пресс», 2026.
В настоящем сборнике представлены тезисы докладов участников семинара "Интеграция основного и дополнительного физико-математического образования", проходившего 11 февраля 2026 года в ГБОУ Школа №2007 ФМШ г. москвы, а также другие публикации, посвящённые вопросам дополнительного физико-математического образования. ...
Added: May 11, 2026
Novikov R., V. N. Sivkin, Inverse Problems 2026 Vol. 42 No. 4 Article 045009
We consider a plane wave, a radiation solution, and the sum of these solutions (total solution) for
the Helmholtz equation in an exterior region in Rd, d ⩾ 2. In this region, we consider a hyperplane X with sufficiently large distance s from the origin in Rd. We give two-point local formulas
for approximate recovering the radiation ...
Added: May 11, 2026
Hecht M., Hofmann P., Wicaksono D. et al., IMA Journal of Numerical Analysis 2026 Vol. 00 P. 1–30
Recent advances in Bernstein—Walsh theory have extended Bernstein’s Theorem to multiple dimensions, stating that a multivariate function can be approximated with a geometric rate in a downward-closed polynomial space if and only if it is analytic in a generalized Bernstein polyellipse. To compute approximations of this class of functions—which we term Bos–Levenberg–Trefethen–(BLT) functions—we extend the ...
Added: May 11, 2026
Kelbert M., Kalimulina E. Y., Entropy 2026 Vol. 28 Article 536
We study binary hypothesis testing for i.i.d. observations under a multiplicative context
weight. For the optimal weighted total loss, defined as the sum of weighted type-I and typeII losses, we prove the logarithmic asymptotic L∗n = exp{−nDwC (P,Q) + o(n)}, n →∞, where Dw
C is the weighted Chernoff information. The single-letter form of the exponent
relies on ...
Added: May 7, 2026
N. Belousov, L. Cherepanov, Derkachov S. et al., Selecta Mathematica, New Series 2026 Vol. 32 Article 44
We prove equivalence of two integral representations for the wave functions of hyperbolic Calogero–Sutherland system. For this we study two families of Baxter operators related to hyperbolic Calogero–Sutherland and rational Ruijsenaars models; the first one as a limit from hyperbolic Ruijsenaars system, while the second one independently. Besides, computing asymptotics of integral representations and also ...
Added: May 6, 2026
Balaban M., Василиженко А. А., Karachurina L. B. et al., Известия РАН. Серия географическая 2026 Т. 90 № S1 С. 208–230
The dynamics of population size in settlements are determined by a wide range of factors, among which, as research shows, is the availability of educational and healthcare institutions (i.e., basic social infrastructure) within close proximity to homes of residents. A bidirectional relationship can be assumed: a decline in population size leads to a reduction of ...
Added: November 7, 2025
Karachurina L. B., Mkrtchyan N. V., Социологические исследования 2025 № 5 С. 109–124
Receiving education and healthcare services is a basic need of the population, therefore, providing the population with access to social infrastructure institutions (various types of schools, preschool institutions, hospitals, rural outpatient clinics) is an important task of regional and municipal authorities. If by “access” we mean “the availability of social infrastructure at the place of ...
Added: July 5, 2025
Arkhipova M., Sirotin V., В кн.: Цифровая экономика как драйвер экономического и социального развития: материалы IV международной научной конференции.: М.: МГИМО (У) МИД РФ, 2023. Гл. 3 С. 39–56.
Цифровая трансформация, охватывающая многие сферы социальноэкономической жизни общества, является одним из наиболее актуальных и перспективных трендов в развитых странах и, в особенности, в крупных мегаполисах. В России, как и в большинстве стран мира, столица берет на себя ведущую роль в сфере внедрения инноваций и апробации передовых технологий как в области управления и организации социального ландшафта, ...
Added: January 12, 2024
М.: МГИМО (У) МИД РФ, 2023.
В сборнике статей представлены результаты исследований по проблемам экономического роста и развития экономики, использования больших данных и информационнокоммуникационных технологий в бизнес-среде и на государственном уровне. Авторами предлагаются научно обоснованные теоретические, методологические и практические подходы, предназначенные для решения актуальных вопросов развития экономики и ё финансов в современных условиях, исследуется генезис проблем современной экономической науки и тенденции ...
Added: January 12, 2024
Konakov V., Menozzi S., / Series arXiv "math". 2023. No. 2312.06222.
Abstract. We prove central and local limit theorems for random walks on the Poincar´e hyperbolic space of
dimension n ě 2. To this end we use the ball model and describe the walk therein through the M¨obius addition
and multiplication. This also allows to derive a corresponding law of large numbers. ...
Added: December 12, 2023
Makarov V., Bakhtizin A., Beklaryan G. et al., Бизнес-информатика 2022 Т. 16 № 1 С. 7–21
This article presents an approach to modeling migration and demographic processes using a framework designed for large-scale agent-based modeling – FLAME GPU. This approach is based on the previously developed simulation model of interaction between two communities: migrants and natives that is implemented in the AnyLogic simulation software. The model has had a low dimensionality ...
Added: May 31, 2022
Zheltukhin A. S., Puzachenko Y. G., Kotlov I. et al., Biology Bulletin Reviews 2017 Vol. 7 No. 1 P. 37–55
Observations of trail activity of the martens, mountain hares, and red squirrels in winter along fixed routes in the Central Forest Reserve showed its high variability and synchronism in time and space. Polynomial dependence of the trail activity and correlation between spatial distribution of marten, mountain hare and squirrel are detected. The influence of weather ...
Added: March 27, 2022
Feng Y., Molchanov S., Yarovaya E., Methodology and Computing in Applied Probability 2021 Vol. 23 P. 207–218
We consider the time evolution of a lattice branching random walk with local perturbations. Under certain conditions, we prove the Carleman type estimation for the moments of a particle subpopulation number and show the existence of a steady state. ...
Added: October 31, 2021
Chernousova E., Feng Y., Hryniv O. et al., Mathematical Population Studies 2021 Vol. 28 No. 2 P. 63–80
In a lattice population model where individuals evolve as subcritical branching random walks subject to external immigration, the cumulants are estimated and the existence of the steady state is proved. The resulting dynamics are Lyapunov stable in that their qualitative behavior does not change under suitable perturbations of the main parameters of the model. An ...
Added: October 31, 2021
Nefedova T., Medvedev A., Regional Research of Russia 2020 Vol. 10 No. 4 P. 549–561
The article is based on an integrated approach that includes joint consideration of shrinkage of traditional agricultural land use, an increase in the share of small and abandoned villages, and expansion of new types of recreational use of rural areas around Moscow and Moscow oblast. The use in the article of statistical indicators for federal ...
Added: August 22, 2021
Grishunina S., , in: Methodology and Computing in Applied ProbabilityVol. 22: Methodology and Computing in Applied Probability. Issue 4: Methodology and Computing in Applied Probability.: Netherlands: Springer, 2020. Ch. 8 P. 1529–1538.
In this paper a multi-server queueing system with regenerative input flow and independent service times with finite means is studied. We consider queueing systems with various disciplines of the service performance: systems with a common queue and systems with individual queues in front of the servers. In the second case an arrived customer chooses one ...
Added: February 2, 2021