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Ecuații diferențiale. Ecuații integrale. Alte ecuații funcționale. Diferențe finite. Calculul variațional. Analiză funcțională (242) |
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SM ISO690:2012 CHEBAN, David. Levitan Almost Periodic Solutions of Infinite-dimensional Linear Differential Equations. In: Buletinul Academiei de Ştiinţe a Republicii Moldova. Matematica, 2019, nr. 2(90), pp. 56-78. ISSN 1024-7696. |
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Buletinul Academiei de Ştiinţe a Republicii Moldova. Matematica | ||||||
Numărul 2(90) / 2019 / ISSN 1024-7696 /ISSNe 2587-4322 | ||||||
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CZU: 517.926+519.6 | ||||||
MSC 2010: 34C27, 34G10, 35B15. | ||||||
Pag. 56-78 | ||||||
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The known Levitan’s Theorem states that the finite-dimensional linear differential equation x′ = A(t)x + f(t) (1) with Bohr almost periodic coefficients A(t) and f(t) admits at least one Levitan almost periodic solution if it has a bounded solution. The main assumption in this theorem is the separation among bounded solutions of homogeneous equations x′ = A(t)x . (2) In this paper we prove that infinite-dimensional linear differential equation (3) with Levitan almost periodic coefficients has a Levitan almost periodic solution if it has at least one relatively compact solution and the trivial solution of equation (2) is Lyapunov stable. We study the problem of existence of Bohr/Levitan almost periodic solutions for infinite-dimensional equation (3) in the framework of general nonautonomous dynamical systems (cocycles). |
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Cuvinte-cheie Levitan almost periodic solution linear differential equation common fixed point for noncommutative affine semigroups of affine mappings |
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