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Brief Communications

On the Completeness of a Part of Root Vectors for a Class of Third-Order Quasi-Elliptic Operator Pencils

S. S. Mirzoyev^ab, A. T. Gazilova<sup>a

a</sup> Baku State University
^b Institute of Mathematics and Mechanics, Azerbaijan National Academy of Sciences

Keywords: Hilbert space, operator pencil, operator differential equation, completeness of a system of root vectors.

Received: 14.11.2018

DOI: 10.4213/mzm12250

 English version: Mathematical Notes, 2019, 105:5, 798–801

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