Geodesic
Well-posedness and ill-posedness of boundary-value problems for one class of fourth-order differential equations of Sobolev type
Itogi nauki i tehniki. Sovremennaâ matematika i eë priloženiâ. Tematičeskie obzory, Differential Equations and Mathematical Physics, Tome 198 (2021), pp. 68-75.

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This paper is devoted to the study of the well-posedness of boundary-value problems for Sobolev-type differential equations \begin{equation*} \frac{\partial^2}{\partial t^2}(Au)+Bu+h(x,y,t)Cu=f(x,y,t), \end{equation*} in which $x$ is a point from the bounded domain $\Omega$ of the space $\mathbb{R}^n_x$, $y$ is a point from the bounded domain $G$ of the space $\mathbb{R}^m_y$, $t$ is a point of the interval $(0,T)$, $A$ and $B$ are second-order elliptic operators acting on variables $x_1,\ldots,x_n$, $C$ is a second-order elliptic operator acting on $y_1,\ldots,y_m$, and $h(x,y,t)$ and $f(x,y,t)$ are given functions. For these equations, we study the well-posedness in the S. L. Sobolev spaces of the initial-boundary-value and Dirichlet problems.
Mots-clés : Sobolev-type equations, pseudoelliptic equations
Keywords: pseudohyperbolic equations, initial-boundary value problem, Dirichlet problem, correctness. 
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A. I. Kozhanov. Well-posedness and ill-posedness of boundary-value problems for one class of fourth-order differential equations of Sobolev type. Itogi nauki i tehniki. Sovremennaâ matematika i eë priloženiâ. Tematičeskie obzory, Differential Equations and Mathematical Physics, Tome 198 (2021), pp. 68-75. http://geodesic.mathdoc.fr/item/INTO_2021_198_a6/

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