2020 - Bulletin of the Institute of Mathematics

Bulletin of the Institute of Mathematics
Founded in 2018
Uzbekistan Academy of Sciences
V.I.Romanovskiy Institute of Mathematics
Mathematical Society of Uzbekistan

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Papers published in 2020

1. Allen I. K., Duggal D., Nasir S., Karimov E. T. On a boundary value problem for a time-fractional wave equation with the Riemann-Liouville and Atangana-Baleanu derivatives (1-9)
2. Alimov Sh. A., Yuldasheva A. V. On Cauchy problem for Boussinesq-type equation (10-14)
3. Babajanov B. A., Ruzmetov M. M., Babajanov A. B.  On the integration of a Toda-type chain with an integral type source (15-26)
4. Muydinjanov D. R. Dirichlet problem for Helmholtz equation with the three singular coefficients (27-36)
5. Ruzimuradova D. H., Azamova N. A. The analytic 3D-system with the limit set consisting of four straight lines (37-40)
6. Abdushukurov F. A., Chuprunov A. N.  On the approximation of a Poisson random variable by a Gaussian random  variable (41-49)
7. Azamov S. S. Construction of a discrete analogue of a differential operator (50-58)
8. Kadirkulov B. J., Jalilov M. A. On a nonlocal problem for fourth-order mixed type equation with the Hilfer operator (59-67)
9. Mamadaliev U. X. Description of solvable Leibniz algebras with nilradical Nm;n (68-74)
10. Mamanazarov A. O. Tricomi problems for a parabolic-hyperbolic equation with singular coefficients (75-89)
11. Nurmuhamedova N. S. Local asymptotic normality of statistical experiments in the competing risks model under combined hybrid random censoring (90-94)
12. Oqboev A. B.  Tricomi problem for parabolic-hyperbolic type equation (95-103)
13. Akhmadjon Urinov (dedicated to 70th Anniversary) (104-106)
14. Fayziev A. A., Turgunov T. T. Statistical analysis and forecasting of cotton yield dynamics in the Republic of Uzbekistan (107-111)
15. Fayazova Z. K. Boundary value problem for heat exchange process with Neumann condition in bound of region with integral condition (112-117)
16. Fayazov K. S., Xajiev I. O. The boundary value problem for a second-order differential equation with one line of degeneracy (118-126)
17.Ergashev T.G., Safarbaeva N.M. Holmgren problem for multidimensional Helmholtz equation with one singular coefficient (127-135)

1. Babadjanova A. K. Integration of the matrix Ablowitz-Ladik lattice with a self-consistent source (1-10)
2. Prenov B. B. Some examples of systems of non-algebraic equations (11-18)
3. Rozikov U. A., Shoyimardonov S. K. A Model for COVID-19 Pandemic and Prediction for Uzbekistan (19-21)
4. Seytov Sh. J., Ganikhodzhayev R. N. The method of graphical analysis for some two dimensional dynamical systems (22-26)
5. Abdurasulov K. K. The isomorphism between algebras Inder ($W_n$ ) and  $W_{n-1}$ (27-33)
6. Boltayev A. K., Akhmedov  D. M. An extremal function of a quadrature formula (34-38)
7. Boltayev N. D.  Coefficients of the optimal quadrature formula for approximate calculation of Fourier integrals (39-46)
8. Islomov B. I., Ubaydullayev U. Sh. On a boundary value problem with boundary conditions of the second kind for an equation of parabolic - hyperbolic type with a fractional order operator in the sense of Caputo in a rectangular domain (47-57)
9. Ismoilov A. S. Uniqueness and existence of a solution to the problem of integral geometry in a strip (58-67)
10. Karimov K. T. Dirichlet type problem for a three-dimensional equation of mixed type with three singular coefficients in a semi-infinite parallelepiped (68-82)
11. Kakadjonava L. R. Uniform theorems of the Glivenko-Cantelli and Donsker type for a sequential integral process of independence (83-91)
12. Muxamedov A. K., Kobilov U. X.  Asymptotic normality of two sample Wilcoxson-Mann-Whitney statistics of strongly positive orthant dependent sequences (92-96)
13.  Safarov J. Sh. The problem of determining the kernel of an integro-differential equations with smooth data in a bounded domain (97-102)
14. Usmonov B. Z. The non-local problem for an equation with the third-order elliptic-hyperbolic operator (103-110)

1. Aralova K. A., Jamilov U. U.  On the dynamics of superposition of non-Volterra quadratic stochastic operators (1-14)
2. Durdiev D. K., Nuriddinov Zh. Z.  Kernel determining problem in the integro–differential heat equation with a variable thermal conductivity (15-26)
3. Eshkabilov Yu. Kh., Nodirov Sh. D. On the positive fixed points of quartic operators (27-36)
4. Imomkulov A. N. On absolute nilpotent elements of the evolution algebras corresponding to approximation of finite dimensional algebras (37-41)
5. Ishmetov A. Ya. On C-properties of the space of idempotent probability measures (42-48)
6. Mamatov M. Sh., Nuritdinov J. T. On some laws for calculating the Đśinkovski difference and sum (49-59)
7. Mustapokulov Kh. Y. On a certain invariance problem for a constant multivalued mapping in a heat conduction problem with impulse control (60-67)
8. Rahmonov E. S., Beshimov G. R. Complete system of invariants of m-points in the two-dimensional bilinear-metric space with the form $x_1y_1-2x_2y_2$ over the field of rational numbers (68-76)
9. Mohd Danish Siddiqi. Generalized Yamabe solitons on Trans Sasakian manifolds (77-85)
10. Sheraliyev Sh. N. On the solvability of the quasi-linear periodic problem of peridynamics (86-93)
11. Umrzaqov N. M. Local derivations of nilpotent algebras of upper triangular matrices (94-97)
12. Usmonov J. B., Kodirova M. A. A quadratic stochastic operator with variable coefficients (98-107)
13. Aripov M. M., Djabborov O. R. Estimation and asymptotics of solutions the parabolic type equation with double non-linearity and damping (108-118)
14. Kasimov Sh. G., Madrahimov U. S., Koshanov A. P. On unique solvability of multidimensional initial-boundary problem of beam oscillations, one end of which is patched, and the other floating in Sobolev spaces (119-136)
15. Irgashev B. Yu.  Construction of self-similar solutions for high-order equations having degeneracy of the first and second kind (137-143)
16. Ruziev M. X. On a boundary value problem for mixed type equation with singular coefficients (144-152)
17. Umarova G. B. Three-dimensional Tricomi problem for a parabolic-hyperbolic equation with two planes of change of type (153-166)
18. Hayotov A. R., Rasulov R. G. Extension of the Euler-Maclaurin quadrature formula in the space $W_2^(5,4)$ (167-176)
19. Xolboev A. G. The pursuit-evasion game on the 1-skeleton graph of Archimedean solids in the space $R^3$ (177-182)
20. Xurramov N. X. Generalization of the Tricomi Problem for one class of equations of mixed type (183-198)
21. Shaimkulov B. A., Bozorov J. T. Conditions for the holomorphic continuation into a unit polydisc of a function defined on the polydisc skeleton (199-203)

"Bulletin of the Institute of Mathematics" electronic journal
(C) Erkinjon Karimov, 2019
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