Some upper bounds for the A-numerical radius of 2x2 block matrices

Xu, QX; Ye, ZM; Zamani, A

Zamani, A (corresponding author), Farhangian Univ, Dept Math, Tehran, Iran.

ADVANCES IN OPERATOR THEORY, 2021; 6 (1):

Abstract

Let A = [GRAPHICS] be the 2 X 2 diagonal operator matrix determined by a positive bounded linear operator A on a Hilbert space. For semi-Hilbertian op......

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