On a boundary-value problem for a functional-differential hyperbolic equation of the third order

We consider a boundary-value problem for a functional-differential factorized hyperbolic equation of the third order not investigated earlier. We prove the existence and uniqueness of its solution.     

On one boundary-value problem for an equation of higher even order

We study boundary-value problem for an equation of even order in a rectangular domain. By the spectralmethod we obtain necessary and sufficient conditions of uniqueness of a solution. The solution is constructed in the formof infinite series in eigenfunctions. We obtain sufficient conditions under which this series is a regular solution.     

A linear periodic boundary-value problem for a second-order hyperbolic equation

We study the boundary-value problemu _tt -u _xx =g(x, t),u(0,t) =u (π,t) = 0,u(x, t +T) =u(x, t), 0 ≤x ≤ π,t ∈ ℝ. We findexact classical solutions of this problem in three Vejvoda-Shtedry spaces, namely, in the classes of, and-periodic functions (q and s are natural numbers). We obtain the results only for sets of periods, and which characterize the classes of π-, 2π -, and 4π-periodic functions. Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 51, No. 2, pp. 281–284, February, 1999.     

Linear periodic boundary-value problem for a second-order hyperbolic equation. I

In three spaces, we obtain exact classical solutions of the boundary-value periodic problem u _tt−a ² u _xx=g(x,t), u(0,t)=u(π,t)=0, u(x,t+T)=u(x,t)=0, x,t∈ĝ Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 50, No. 11, pp. 1537–1544, November, 1998.     

Linear periodic boundary-value problem for a second-order hyperbolic equation. II. Quasilinear problem

In three spaces, we find exact classical solutions of the boundary-value periodic problem u_tt - a²u_xx = g(x, t) u(0, t) = u(π, t) = 0, u(x, t + T) = u(x, t), x ∈ ℝ, t ∈ ℝ. We study the periodic boundary-value problem for a quasilinear equation whose left-hand side is the d’Alembert operator and whose right-hand side is a nonlinear operator. Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 50, No. 12, pp. 1680–1685, December, 1998.     

On boundary-value problem for hyperbolic-type equation of the third order

We formulate some boundary-value problems for a linear third-order equation with hyperbolic operator in the main part and study the unique solvability. Under certain conditions to given functions, using the Riemann method, we obtain an integral representation of solutions. Published in Lietuvos Matematikos Rinkinys, Vol. 47, No. 4, pp. 591–603, October–December, 2007.     

Global solvability of the Cauchy characteristic problem for one class of nonlinear second order hyperbolic systems

The Cauchy characteristic problem in the light cone of the future for one class of nonlinear hyperbolic systems of the second order is considered. The existence and uniqueness of global solution of this problem is proved.     

Solution method for the inverse boundary-value problem for the wave equation

Existence and uniqueness issues are considered for the inverse boundary-value problem of determining the variable coefficient of the one-dimensional wave equation on a half-line. A Tikhonov-regularizing algorithm is constructed to find an approximate solution using input data that are specified with an error.Translated from Metody Matematicheskogo Modelirovaniya, Avtomatizatsiya Obrabotki Nablyudenii i Ikh Primeneniya, pp. 80–88, 1986.     

Asymptotics of the fundamental solution of the cauchy problem for a hyperbolic equation of second order containing a large parameter

An asymptotic expansion of the fundamental solution of the Cauchy problem for a linear hyperbolic equation containing a large parameter is constructed in this paper. The coefficients of the equation are assumed to be infinitely differentiable. The expansion obtained admits termwise differentiation.Translated from Zapiski Nauchnykh Seminarov Leningradskogo Otdeleniya Matematicheskogo Instituta im. V. A. Steklova AN SSSR, Vol. 104, pp. 93–101, 1981.The author wishes to thank V. M. Babich for posing the problem and for his constant attention to the work.     

Solution of the poisson equation related to a boundary-value problem for the sphere

Zusammenfassung Es werden Lösungen der Poissonschen Differentialgleichungen in den Bereichen innerhalb und ausserhalb einer Sphäre, die gewisse Grenzbedingungen an der Fläche der Sphäre erfüllen, gesucht. Solche Lösungen werden schliesslich als Funktion partikulärer Integrale der Differentialgleichungen ausgedrückt. Ihre Anwendung auf die theoretische Physik wird anschliessend behandelt.     

A solvability result for a nonlinear weakly hyperbolic equation of second order

In this article we study the well-posedness of the initial value problem for quasi-linear weakly hyperbolic equations of second order. We obtain a sufficient condition for the Cauchy problem to be locally solvable in the class of smooth function.     

A method of characteristics solving the initial-boundary value problem of a hyperbolic differential equation of second order

Summary The ALGOL-procedure¹ char2 presented in this paper can be applied to the initial or initial-boundary value problem of a quasilinear hyperbolic differential equation of second order. A method of characteristics is combined with extrapolation to the limit. Thus, the results are very accurate. The same accuracy can also be obtained if the initial values are only piecewise smooth.Editor's Note: In this fascile, prepublication of algorithms from the Approximation series of the Handbook for Automatic Computation is continued. Algorithms are published in ALGOL 60 reference language as approved by the IFIP. Contributions in this series should be styled after the most recently published ones     

Solution of a nonlocal problem of the first kind for a hyperbolic equation

The spectral method is applied to establish solvability in the class of finite-energy generalized solutions of the mixed problem for a hyperbolic equation with a nonlocal boundary condition of the first kind. The solution is representable as a biorthogonal series in the root functions of the corresponding spectral problem. __________ Translated from Nelineinaya Dinamika i Upravlenie, No. 4, pp. 167–178, 2004.     

One multidimensional version of the Darboux first problem for one class of semilinear second order hyperbolic systems

One multidimensional version of the Darboux first problem for one class of semilinear second order hyperbolic systems is investigated. The questions on local and global solvability and nonexistence of a global solution of this problem are considered.     

Solution of a three-dimensional boundary-value problem for a fractional differential heat conduction equation

We consider a three-dimensional axisymmetric problem for a differential heat conduction equation with fractional time derivatives. Using the method of homogeneous solutions and integral transformations, we obtain an asymptotic and a numerical solution of the problem. The results of calculations are presented.