Green’s function of differential equation with fourth order and normal operator coefficient in half axis

• Bayramoglu, M. ^[1] ; Ozden Koklu, Kevser ^[1]
  1. [1] Yıldız Technical University

     Yıldız Technical University

     Turquía

     
• Localización: Proyecciones: Journal of Mathematics, ISSN 0716-0917, ISSN-e 0717-6279, Vol. 22, Nº. 1, 2003, págs. 15-30
• Idioma: inglés
• DOI: 10.4067/S0716-09172003000100002
• Enlaces
  • Texto completo
• Resumen

  • Let H be an abstract seperable Hilbert space. Denoted by H1 = L2 (0, ∞; H), the all functions defined in [0, ∞) and their values belongs to space H, which R ∞ 0 kf(x)k 2 H dx < ∞. We define inner product in H1 by the formula(f, g)H1 = R ∞ 0 (f, g)Hdx f(x), g(x) ∈ H1,H1 forms a seperable Hilbert space[3] where k.kH and (., .)H are norm and scalar product, respectively in H.  In this study, in space H1, it is investigated that Green’s function (resolvent) of operator formed by the diferential expressiony IV + Q(x)y, 0 ≤ x < ∞,and boundary conditionsy 0 (0) − h1y(0) = 0,y 000(0) − h2y 00(0) = 0,where Q(x) is a normal operator mapping in H and invers of it is a compact operator for every x ∈ [0, ∞). Assume that domain of Q(x) is independent from x and resolvent set of Q(x) belongs to |arg λ − π| < ε (0 < ε < π) of complex plane λ, h1 and h2 are complex numbers. In addition assume that the operator function Q(x) satisfies the Titchmarsh-Levitan conditions.

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