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Russia Nizhni Novgorod
Year
2015
Volume
25
Issue
2
Pages
230-243
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Section Mathematics
Title On the totally global solvability of a controlled Hammerstein type equation with a varied linear operator
Author(-s) Chernov A.V.ab
Affiliations Nizhni Novgorod State Technical Universitya, Nizhni Novgorod State Universityb
Abstract Let $n,m,\ell,s\in\mathbb{N}$ be given numbers, $\Pi\subset\mathbb{R}^n$ be a measurable bounded set, $\mathcal{X}, \mathcal{Z}, \mathcal{U}$ be Banach ideal spaces of functions measurable on the set $\Pi$, $\mathcal{D}\subset\mathcal{U}^{s}$ be a convex set, $\mathcal{A}$ be some class of linear bounded operators $A:\mathcal{Z}^{m} \to\mathcal{X}^{\ell}$. We study the controlled Hammerstein type functional operator equation as follows $$ x(t)=\theta(t)+ A\Bigl[ f(.,x(.),u(.)) \Bigr](t), \quad t\in \Pi , \quad x\in\mathcal{X}^{\ell}, \qquad \qquad (1)$$ where $\{ u,\theta,A\}\in \mathcal{D}\times \mathcal{X}^{\ell}\times \mathcal{A}$ is the set of controlled parameters; $f(t,x,v): \Pi\times\mathbb{R}^{\ell}\times\mathbb{R}^{s}\to\mathbb{R}^{m}$ is a given function measurable with respect to $t\in\Pi$, continuous with respect to $\{x,v\}\in\mathbb{R}^\ell\times\mathbb{R}^s$ and satisfying to certain natural hypotheses. Eq. $(1)$ is a convenient form of representation of the broad class of controlled distributed systems. For the equation under study we prove a theorem concerning sufficient conditions of global solvability for all $u\in\mathcal{D}$, $A\in\mathcal{A}$ and $\theta$ from a pointwise bounded set. For the original equation we define some majorant and minorant inequalities obtaining them from Eq. $(1)$ with the help of upper and lower estimates of the right-hand side. The theorem is proved providing global solvability of the majorant and minorant inequalities. As an application of obtained general results we prove a theorem concerning the total (with respect to the whole set of admissible controls) global solvability of the mixed boundary value problem for a system of hyperbolic equations of the first order with controlled higher coefficients.
Keywords totally global solvability, functional operator equation of the Hammerstein type, pointwise estimate of solutions, system of hyperbolic equations of the first order with controlled higher coefficients
UDC 517.957, 517.988, 517.977.56
MSC 47J05, 47J35, 47N10
DOI 10.20537/vm150207
Received 29 March 2015
Language Russian
Citation Chernov A.V. On the totally global solvability of a controlled Hammerstein type equation with a varied linear operator, Vestnik Udmurtskogo Universiteta. Matematika. Mekhanika. Komp'yuternye Nauki, 2015, vol. 25, issue 2, pp. 230-243.
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