Solution of certain problem with nonlocal boundary condition for one-dimensional wave equation by Elvira E. Gasanova, Ludmila S. Pulkina

“…To prove the solvability of the problem we construct biortogonal basis consisting of eigen- and adjoint-functions of not self adjoint operator.…”
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Positive Solutions of Eigenvalue Problems for a Class of Fractional Differential Equations with Derivatives by Xinguang Zhang, Lishan Liu, Benchawan Wiwatanapataphee, Yonghong Wu

“…By establishing a maximal principle and constructing upper and lower solutions, the existence of positive solutions for the eigenvalue problem of a class of fractional differential equations is discussed. …”
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A Morley Type Triangular Finite Element with High Convergence for the Biharmonic Problem by Yuan Bao, Sibo Yang

“…In this work, we construct a theoretical framework to develop non <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mi>C</mi><mn>0</mn></msup></semantics></math></inline-formula> Morley type nonconforming high-convergence elements for biharmonic problems. …”
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Solution of the mixed boundary problem for the Poisson equation on two-dimensional irregular domains by M. M. Chuiko, O. M. Korolyova

“…To solve a mixed boundary value problem for the Poisson equation in two-dimensional irregular domains, the computational algorithm of second-order accuracy is constructed. …”
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How democracies live: a review essay on Shadi Hamid’s The Problem of Democracy by Ilia Murtazashvili

“…Shadi Hamid’s The Problem of Democracy is the rare book that will be of immense value to both those who agree and disagree with its argument. …”
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A Source Problem for the Helmholtz Equation via a Dirichlet-to-Neumann Map by Kuo-Ming Lee

“…Based on the boundary integral equation method, a Dirichlet-to-Neumann map in terms of boundary integral operators on the boundary of the source is constructed to transform this problem into two boundary value problems for the Helmholtz equation.…”
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Solvability of a Hadamard Fractional Boundary Value Problem at Resonance on Infinite Domain by Xingfang Feng, Yucheng Li

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The Perturbed Riemann Problem for the Aw-Rascle Model with Modified Chaplygin Gas Pressure by Yujin Liu, Wenhua Sun

“…This paper is concerned with the perturbed Riemann problem for the Aw-Rascle model with the modified Chaplygin gas pressure. …”
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Application of Flow Theory Relations for Solving Problems of Steady-State Crack Growth by M. A. Hundzina, O. V. Yuhnovskaya

“…The deformation diagram has been constructed for the material steel 40. The research results can be used to construct stress and strain fields in the vicinity of a crack, as well as to predict the further direction of crack development.…”
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The main directions of solving problems in the field of recycling of rubber waste of auto transport by I. A. Eychler

“…The article discusses the current situation in the sphere of recycling of rubber waste of auto transport, identifies the main problems of this segment, processes of system are identified and grouped in three basic stages, constructed the map of the processes of the system based on the obtained results, and with using process approach to management of systems offers possible organizational and administrative decisions identified problems on each stages of execution interorganizational business process.…”
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Control problem for the impulse process under stochastic optimization procedure and Levy conditions by Ya. M. Chabanyuk, A. V. Nikitin, U. T. Khimka

“…A stochastic approximation procedure and a limit generator of the original problem are constructed for a system of stochastic differential equations with Markov switching and impulse perturbation under Levy approximation conditions with control, which is determined by the condition for the extremum of the quality criterion function. …”
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Primary school students’ problem-solving strategies in creating artworks with GeoGebra by Wahid Yunianto, Daniel Jarvis, Zsolt Lavicza, Zetra Hainul Putra, Shereen El-Bedewy

“… Computational thinking (CT) as a problem-solving skill has been argued to be an essential skill for all learners. …”
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Dynamic inverse piezo-effect problem for a long piezoceramic thermoelastic cylinder by M. A. Kalmova

“…A new closed solution to the dynamic inverse piezoelectric effect problem for a long piezoceramic thermoelastic cylinder is constructed. …”
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Multiple Positive Solutions for the Dirichlet Boundary Value Problems by Phase Plane Analysis by A. Kirichuka, F. Sadyrbaev

“…We consider boundary value problems for scalar differential equation x′′+λfx=0, x(0)=0, x(1)=0, where f(x) is a seventh-degree polynomial and λ is a parameter. …”
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Analyzing inverse backward problem in nonlinear integro-differential equation with memory kernel by M.J. Huntul

“…The proposed problem is ill-posed in the sense of Hadamard. Moreover, the Fourier truncation method is used to construct a regularized solution. …”
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A Proposed Analytical Method for Solving Fuzzy Linear Initial Value Problems by Amal khalaf Haydar

“…In this article, we aim to define a universal set consisting of the subscripts of the fuzzy differential equation (5) except the two elements  and , subsets of that universal set are defined according to certain conditions. Then, we use the constructed universal set with its subsets for suggesting an analytical method which facilitates solving fuzzy initial value problems of any order by using the strongly generalized H-differentiability. …”
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On One Generalization of the Multipoint Nonlocal Contact Problem for Elliptic Equation in Rectangular Area by Tinatin Davitashvili, Hamlet Meladze, Francisco Criado-Aldeanueva, Jose Maria Sanchez

“…The method of separation of variables is used to find the solution of a stated problem in the case of Poisson’s equation. Then, the more general problem with nonlocal multipoint contact conditions for elliptic equation with variable coefficients is considered, and the iterative method to solve the problem numerically is constructed and investigated. …”
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Approximation of a singular boundary value problem for a linear differential equation by R. Uteshova, Y. Kokotova

“… This paper addresses the approximation of a bounded (on the entire real axis) solution of a linear ordinary differential equation, where the matrix approaches zero as t →∓∞ and the right-hand side is bounded with a weight. We construct regular two-point boundary value problems to approximate the original problem, assuming the matrix and the right-hand side, both weighted, are constant in the limit. …”
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ON THE CHERNOUS'KO TIME-OPTIMAL PROBLEM FOR THE EQUATION OF HEAT CONDUCTIVITY IN A ROD by Abdulla A. Azamov, Jasurbek A. Bakhramov, Odiljon S. Akhmedov

“…The time-optimal problem for the controllable equation of heat conductivity in a rod is considered. …”
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Statement of Problem: Dangerous Desires in Orwell's 1984 and the Present Spanish Penal Code by Alison Hogg

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