Articles by Author: Ekin U Urlu

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  1. Spectral analysis of the Direct Sum Hamiltonian Operators

    Spectral analysis of the Direct Sum Hamiltonian Operators

    Item type: Journal Article • Journal: Quaestiones Mathematicae
    In this paper we investigate the deficiency indices theory and the selfad-joint and nonselfadjoint (dissipative, accumulative) extensions of the minimal symmetric direct sum Hamiltonian operators. In particular using the equivalence of the Lax-Phillips scattering matrix and the Sz.-Nagy-Foia¸s characteristic function,...
  2. Singular multiparameter dynamic equations with distributional potentials on time scales

    Singular multiparameter dynamic equations with distributional potentials on time scales

    Item type: Journal Article • Journal: Quaestiones Mathematicae
    In this paper, we consider both singular single and several multiparameter second order dynamic equations with distributional potentials on semi-infinite time scales. At first we construct Weyl’s theory for the single singular multiparameter dynamic equation with distributional potentials and we...