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Brief Communications

On the Completeness of Elementary Solutions of a Class of Second-Order Differential Equations with Operator Coefficients

S. S. Mirzoev^a, F. A. Gulieva<sup>b

a</sup> Institute of Applied Mathematics, Baku State University
^b Azerbaijan University of Cooperation

Keywords: second-order differential equation, Hilbert space, self-adjoint operator, operator pencil, entire function.

Received: 24.03.2009

DOI: 10.4213/mzm8519

 English version: Mathematical Notes, 2009, 86:5, 747–750

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