• On the solvability of one inverse problem for a fourth-order equation 

  Bekiev, A.B. (Karagandy University of the name of academician E.A. Buketov, 2025)

  In this paper, for a fourth-order equation in a rectangular domain, an inverse problem of finding the unknown right-hand side, which depends on one variable, is considered. Criteria for the uniqueness and existence of a ...
• Bipartite Digraphs with Modular Concept Lattices of height 2 

  Basheyeva, А.O.; Zhussupova, A.T.; Nurlibayev, Y.K. (Karagandy University of the name of academician E.A. Buketov, 2025)

  This paper investigates the interaction between Formal Concept Analysis (FCA) and graph theory, with a focus on understanding the structure and representation of concept lattices derived from bipartite directed graphs. ...
• Mixed problem for a third order parabolic-hyperbolic model equation 

  Balkizov, Zh.A. (Karagandy University of the name of academician E.A. Buketov, 2025)

  In 1978, the journal Differential Equations published an article by A.M. Nakhushev, that presented a method for correctly formulating a boundary value problem for a class of second-order parabolic-hyperbolic equations ...
• On solvability of the initial-boundary value problems for a nonlocal hyperbolic equation with periodic boundary conditions 

  Baizhanova, M.T.; Turmetov, B.Kh. (Karagandy University of the name of academician E.A. Buketov, 2025)

  In this paper, the solvability of initial-boundary value problems for a nonlocal analogue of a hyperbolic equation in a cylindrical domain is studied. The elliptic part of the considered equation involves a nonlocal Laplace ...
• On solving the second boundary value problem for the Viscous Transonic Equation 

  Apakov, Yu.P.; Ibrokhimov, Kh.K. (Karagandy University of the name of academician E.A. Buketov, 2025)

  In a rectangular domain, the second boundary value problem for the Viscous Transonic Equation is considered. The uniqueness of the solution to the problem is proved using the energy integral method. The existence of a ...
• On the Convergence of the Approximate Solution to the Optimization Problem for Oscillatory Processes 

  Abdyldaeva, E.F.; Kerimbekov, А.; Yuldashev, T.K.; Kamali, M. (Karagandy University of the name of academician E.A. Buketov, 2025)

  This article addresses the non-linear optimization problem of oscillatory processes governed by partial integro-differential equations involving a Fredholm integral operator. A distinctive feature of the problem is that ...
• Classification and reduction to canonical form of linear differential equations partial of the sixth-order with non-multiple characteristics 

  Abdukodirov, A.T.; Tulkinboev, T.A. (Karagandy University of the name of academician E.A. Buketov, 2025)

  This paper studies the problems of classification and reduction to canonical form of linear partial differential equations of the sixth-order with non-multiple characteristics and constant coefficients. Considering ...
• On the properties for families of function classes over harmonic intervals and their embedding relation with Besov spaces 

  Yessenbayeva, G.A.; Serikova, L.A. (Bulletin of the Karaganda University, 2025)

  The article is dedicated to the issues of studying the approximation of functions by trigonometric polynomials with a spectrum from special sets. In this paper, these special sets are harmonic intervals. To study ...
• Analyzing Restrained Pitchfork Domination Across Path-Related Graph Structures 

  Vijayalakshmi, P.; Karuppasamy, K. (2025)

  Let G = (V,E) be a finite, simple, and undirected graph without an isolated vertex. A dominating subset D ⊆ V (G) is a restrained pitchfork dominating set if 1 ≤ |N(u) ∩ V − D| ≤ 2 for every u ∈ D and every vertex not ...
• Hyper-Generalized Weakly Symmetric Para-Sasakian Manifolds and Their Geometric Properties 

  Thangjam, B.; Devi, M.S. (Bulletin of the Karaganda University, 2025)

  This paper examines para-Sasakian manifolds that satisfy a hyper-generalized weakly symmetric curvature condition. The conditions under which such a manifold with a hyper-generalized weakly symmetric curvature condition ...
• Variational method of numerical solution of the inverse problem of gas lift oil production process 

  Temirbekov, N.M.; Turarov, A.K. (Bulletin of the Karaganda University, 2025)

  This paper proposes a constructive method for numerically solving direct and inverse problems arising in the gas-lift oil production process, which is described by a hyperbolic system of differential equations. To solve ...
• Non-polynomial spline method for singularly perturbed differential difference equations with delay and advance terms 

  Regal, A.M.; Kumar, S.D. (Bulletin of the Karaganda University, 2025)

  In this study, we introduced a non-polynomial spline technique to address singularly perturbed differential difference equations involving both delay and advanced parameters. This method exhibits a linear rate of convergence, ...
• Exponentially fitted finite difference methods for a singularly perturbed nonlinear differential-difference equation with a small negative shift 

  Prathap, T.; Nageshwar Rao, R. (Bulletin of the Karaganda University, 2025)

  This study presents exponentially fitted finite difference methods for solving a singularly perturbed nonlinear differential-difference equation that consists of a small negative shift. The quasilinearization technique is ...
• Solutions of boundary value problems for loaded hyperbolic type equations 

  Orumbayeva, N.T.; Kosmakova, M.T.; Tokmagambetova, T.D.; Manat, A.M. (Bulletin of the Karaganda University, 2025)

  This paper investigates a class of second-order partial differential equations describing wave processes with nonlocal effects, including cases involving fractional derivatives. Such equations often arise in the theory of ...
• A combined problem with local and nonlocal conditions for a class of mixed-type equations 

  Mirsaburov, M.; Makulbay, A.B.; Mirsaburova, G.M. (Bulletin of the Karaganda University, 2025)

  This paper investigates the issues of existence and uniqueness of a solution to a combined boundary value problem with local and nonlocal conditions for a specific class of mixed elliptic-hyperbolic-type equations with ...
• On gMT - and g β-convexity and the Ostrowski type inequalities 

  Lakhal, F.; Meftah, B. (Bulletin of the Karaganda University, 2025)

  In this study, motivated by recent results on Ostrowski-type inequalities, we introduce a new identity that serves as a basis for establishing fractional Ostrowski inequalities. Specifically, we focus on functions whose ...
• Liftings from Lorentzian α-Sasakian manifolds to tangent bundles 

  Khan, M.N.I.; De, U.C.; Choudhary, M.A. (Bulletin of the Karaganda University, 2025)

  The goal of the current study is to investigate the complete lift of Lorentzian α-Sasakian manifolds to the tangent bundle TM. We also examine the complete lift of the different four types of Lorentzian α-Sasakian ...
• Spectral analysis of second order quantum difference operator over the sequence space lρ (1 < ρ < ∞) 

  Kalita, N.; Dutta, A.J. (Bulletin of the Karaganda University, 2025)

  In this article, we study the spectrum, fine spectrum and boundedness property of second order quantum difference operator Δ2q (0 < q < 1) over the class of sequence lρ (1 < ρ < ∞), the pth summable sequence space. The ...
• On two four-dimensional curl operators and their applications 

  Jenaliyev, M.T.; Kassymbekova, A.S.; Yergaliyev, M.G. (Bulletin of the Karaganda University, 2025)

  Academician O.A. Ladyzhenskaya emphasized the importance of constructing a fundamental system in the space of solenoidal functions for simple domains such as squares, cubes, and similar regions. This article examines the ...
• Computational of the eigenvalues of the fractional Sturm-Liouville problem 

  Jafari, M.; Saei, F.D. (Bulletin of the Karaganda University, 2025)

  We study the asymptotic distribution for eigenvalues of fourth-order fractional Sturm-Liouville with Dirichlet boundary condition. In this work, we use the inverse Laplace transform method and the Asymptotic formula of ...

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