Geodesic
Degenerate first order differential-operator equations
Proceedings of the Yerevan State University. Physical and mathematical sciences, Tome 53 (2019) no. 3, pp. 163-169.

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We consider boundary value problem for degenerate first order differential-operator equation $Lu\equiv t^{\alpha}u'-Pu=f, ~u(0)-\mu u(b)=0,$ where $t\in(0,b), \alpha\geq 0$, $P:H\rightarrow H$ is linear operator in separable Hilbert space $H, f\in L_{2,\beta}((0,b),H),~\mu\in\mathbb{C}$. We prove that under some conditions on the operator $P$ and number $\mu$ boundary value problem has unique generalized solution $u\in L_{2,\beta}((0,b),H)$ when $2\alpha+\beta1$, $\beta\geq 0$ and for any $f\in L_{2,\beta}((0,b),H)$.
Keywords: linear boundary value problems, spectral theory of linear operators. 
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L. P. Tepoyan. Degenerate first order differential-operator equations. Proceedings of the Yerevan State University. Physical and mathematical sciences, Tome 53 (2019) no. 3, pp. 163-169. http://geodesic.mathdoc.fr/item/UZERU_2019_53_3_a3/

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