Contents

Lobachevskii Journal of Mathematics


Vol. 47, No. 7, 2026


Summation in Mean of Regularized Traces

Z. Yu. Fazullin, B. E. Kanguzhin, and Y. AL-Doais p. 3061  abstract

Dirichlet Series of the Same Order in Half-Strips

A. M. Gaisin and G. A. Gaisina p. 3068  abstract

On Unconditional Bases of Reproducing Kernels in Fock Type Spaces with Almost Radial Weight

K. P. Isaev and R. S. Yulmukhametov p. 3079  abstract

On Some Properties of the Spectrum and the System of Root Vectors of a Differential Operator on a Curve with Integral Conditions

Kh. K. Ishkin and A. D. Akhmetshina p. 3092  abstract

Completeness of Systems of Root Functions of Third-order Differential Operators with General Boundary Conditions

B. Kanguzhin, Zh. Kaiyrbek, and Zh. Khuzhakhmetov p. 3103  abstract

On the Intersection of Principal Ideals in Algebras of Functions

B. N. Khabibullin p. 3114  abstract

Boundary Value Problem for the Euler–Darboux Equation with Two Degeneracy Lines in Characteristic Coordinates with a Trivial Coefficient of the Abscissa Derivative of the Sought-for Function

S. V. Podkletnova p. 3119  abstract

Direct and Inverse Analytical and Numerical Solution of the Cauchy Problem for Three-Dimensional Inhomogeneous Helmholtz Equation

E. N. Sattorov and Z. E. Ermamatova p. 3128  abstract

Topological Methods in the Problem of Bifurcation of Forced Oscillations in Two-Parameter Systems

M. G. Yumagulov and M. N. Kungirov p. 3139  abstract

On the Hamiltonian Structure of Linear Differential Equations with Periodic Coefficients

M. G. Yumagulov, L. S. Ibragimova, and A. S. Belova p. 3147  abstract

Asymptotic Estimates of the Capillary Rise on Ribbon-Like Fibers in the Case of Perfect Wetting

M. M. Alimov p. 3157  abstract

An Inverse Coefficient Problem for a Time-fractional Pseudo-parabolic Equation with a Logarithmic Nonlinearity

R. R. Ashurov and A. O. Mamanazarov p. 3178  abstract

Solution of the Inverse Problem of Nonisothermal Filtration in a Horizontal Well Based on Regularization Methods

E. R. Badertdinova, K. A. Kokin, M. Kh. Khairullin, and M. N. Shamsiev p. 3193  abstract

The Integral Geometry Problem in a Layer for Paraboloidal Surfaces with a Vertex Singularity

Akram Begmatov, Alisher Ismoilov, and Akhror Bozorov p. 3202  abstract

Does Zipf’s Law Hold True for Chinese?

V. V. Bochkarev and A. V. Shevlyakova p. 3214  abstract

Similarity-based Clustering of Probability Density Functions

Jen-Hao Chen, Wen-Laing Hung, Pornpiya Vikitset, and Andrei Volodin p. 3220  abstract

An Approach to Statistical Convergence with Respect to Power Series Method in Measure for Double Sequences

Selin Çınar p. 3237  abstract

A Topological Approach for Evaluating the Correctness of Chatbot Responses

M. Djeribie and A. M. Sukhov p. 3246  abstract

Analysis of Controllability and Stability for Fractional Hybrid Differential Equations with Weighted Norms

Okan Duman p. 3256  abstract

An Inverse Problem for Integro-Differential Pseudoparabolic Equation with Nonlocal Initial and Non-Classical Boundary Conditions

D. K. Durdiev, J. J. Jumaev, and B. R. Abdullaev p. 3267  abstract

Numerical Modeling of the Deposit Seismic Exploration in the Arctic Conditions using Different Models of Fractured Oil Bearing

E. K. Guseva, K. A. Kovalev, and I. B. Petrov p. 3281  abstract

Centralizer of Separating Flows on Uniform Space

Bo Han and K. Tajbakhsh p. 3293  abstract

A Conjecture on a Tight Norm Inequality in the Finite-Dimensional \(\boldsymbol{l_{p}}\)

A. S. Holevo and A. V. Utkin p. 3300  abstract

Frobenius–Bessel Transmutation Operators for Perturbed Third-Order Hyper-Bessel Equations

Iness Jebabli p. 3311  abstract

Simulation of Unsteady Heat and Mass Transfer in Electric Centrifugal Pumping Unit

V. M. Konyukhov and I. V. Konyukhov p. 3327  abstract

LLMs on Guard: Training Language Models to Be More Positive Toward the Country of Use

G. P. Kovalev, S. O. Urazov, M. M. Tikhomirov, N. V. Loukachevitch, and B. V. Dobrov p. 3344  abstract

Grid Approximation of Fractional Derivative with Hidden Memory

A. Lapin and D. Yakubovsky p. 3361  abstract

New Texture Features of Manuscript Based on Radon Transform

R. Kh. Latypov and E. L. Stolov p. 3375  abstract

Asymptotic Expansion of the Solution for a Singularly Perturbed Boundary Value Problem with Unbounded Boundary Condition

A. E. Mirzakulova, N. Atakhan, E. Nurgabylov, and N. Asset p. 3383  abstract

Evolution of Landau-Based Models of Ferroelectric Hysteresis: Approaches to Numerical Implementation for Advanced Cases

L. I. Moroz and A. G. Maslovskaya p. 3391  abstract

Existence of Solutions for Multi-Point Boundary Value Problems with Integral Conditions at Resonance

S. Nasri, R. Khaldi, and A. Guezane-Lakoud p. 3408  abstract

Quasilinear Differential Equation with Riemann–Liouville Fractional Derivative and Logarithmic Nonlinearity

N. Nyamoradi, Manuel Bonilla, Jesús A. Rodríguez, and César E. Torres Ledesma p. 3422  abstract

Self-similarity in the Tasks of the Bed Deformations

A. G. Petrov and I. I. Potapov p. 3446  abstract

On Solution of the Double R-linear Conjugation Problem

S. Rogosin and M. Dubatovskaya p. 3457  abstract

Boundary Value Problem for an Elliptic Equation Degenerating Inside a Domain

M. Kh. Ruziev and G. O. Sarsenbaeva p. 3469  abstract

On the Qualitative Theory of Splitting Three-Dimensional Autonomous Polynomial Dynamical Systems

Y. Shestopalov and A. Shakhverdiev p. 3477  abstract

Online Generalized Multiscale Finite Element Method for Thermoporoelastic Problems with Phase Transitions and Fractional Derivatives

A. Tyrylgin and V. Alekseev p. 3493  abstract

Enhancing Predictive Performance of Logistic Regression Integrated with Imbalanced Data Management Techniques

Darika Yamrubboon, Katechan Jampachaisri, and Natcha Kunjiratanachot p. 3511  abstract

Optimal Control for a Fractional Differential-Integral Equation with Degeneration in a Locally Convex Space

T. K. Yuldashev, F. U. Sulaimanov, T. M. Zholdoshov, and M. K. Mamanov p. 3525  abstract

Effect of Pore Space Heterogeneity on Invasion Dynamics in Digital Rocks: A Description Using Euler Number and Fractal Dimension

T. R. Zakirov, R. I. Kadyrov, A. F. Shakirzyanov, and A. S. Khayuzkin p. 3539  abstract

Erratum

Erratum to: On demi Uaw-Dunford–Pettis Operators

Z. Jbeli p. 3548  abstract

Erratum to: Strongly Unimodal Distributions of Measure on R\({}_{\boldsymbol{+}}\) with Smoothness Condition of Densities

Yu. P. Virchenko and A. M. Tewolde p. 3549  abstract