Electron. J. Differential Equations, Vol. 2016 (2016), No. 281, pp. 1-9.

Boundary-value problems for wave equations with data on the whole boundary

Makhmud A. Sadybekov, Nurgissa A. Yessirkegenov

Abstract:
In this article we propose a new formulation of boundary-value problem for a one-dimensional wave equation in a rectangular domain in which boundary conditions are given on the whole boundary. We prove the well-posedness of boundary-value problem in the classical and generalized senses. To substantiate the well-posedness of this problem it is necessary to have an effective representation of the general solution of the problem. In this direction we obtain a convenient representation of the general solution for the wave equation in a rectangular domain based on d'Alembert classical formula. The constructed general solution automatically satisfies the boundary conditions by a spatial variable. Further, by setting different boundary conditions according to temporary variable, we get some functional or functional-differential equations. Thus, the proof of the well-posedness of the formulated problem is reduced to question of the existence and uniqueness of solutions of the corresponding functional equations.

Submitted May 12, 2016. Published October 19, 2016.
Math Subject Classifications: 35L05, 35L20, 49K40, 35D35.
Key Words: Wave equation; well-posedness of problems; classical solution; strong solution; d'Alembert's formula.

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Makhmud A. Sadybekov
Institute of Mathematics and Mathematical Modeling
125 Pushkin str., 050010 Almaty, Kazakhstan
email: sadybekov@math.kz
Nurgissa A. Yessirkegenov
Institute of Mathematics and Mathematical Modeling
125 Pushkin str., 050010 Almaty, Kazakhstan
email: n.yessirkegenov15@imperial.ac.uk

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