Geodesic
Identifications for general degenerate problems of hyperbolic type in Hilbert spaces
Contemporary Mathematics. Fundamental Directions, Differential and functional differential equations, Tome 64 (2018) no. 1, pp. 194-210
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In a Hilbert space $X$, we consider the abstract problem \begin{align*} ^*\frac d{dt}(My(t))=Ly(t)+f(t)z,\quad0\le t\le\tau,\\ (0)=My_0, \end{align*} where $L$ is a closed linear operator in $X$ and $M\in\mathcal L(X)$ is not necessarily invertible, $z\in X$. Given the additional information $\Phi[My(t)]=g(t)$ wuth $\Phi\in X^*$, $g\in C^1([0,\tau];\mathbb C)$. We are concerned with the determination of the conditions under which we can identify $f\in C([0,\tau];\mathbb C)$ such that $y$ be a strict solution to the abstract problem, i.e., $My\in C^1([0,\tau];X)$, $Ly\in C([0,\tau];X)$. A similar problem is considered for general second order equations in time. Various examples of these general problems are given. 
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     title = {Identifications for general degenerate problems of hyperbolic type in {Hilbert} spaces},
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A. Favini; G. Marinoschi; H. Tanabe; Ya. Yakubov. Identifications for general degenerate problems of hyperbolic type in Hilbert spaces. Contemporary Mathematics. Fundamental Directions, Differential and functional differential equations, Tome 64 (2018) no. 1, pp. 194-210. http://geodesic.mathdoc.fr/item/CMFD_2018_64_1_a11/

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