Some upper bounds for the $\mathbb{A}$-numerical radius of $2\times 2$ block matrices

DOI10.1007/S43036-020-00102-5zbMath1520.47017arXiv2005.04590MaRDI QIDQ6340377

Qingxiang Xu, Ali Zamani, Zhongming Ye

Publication date: 10 May 2020

Mathematics Subject Classification ID

Hilbert and pre-Hilbert spaces: geometry and topology (including spaces with semidefinite inner product) (46C05) Numerical range, numerical radius (47A12) Positive linear operators and order-bounded operators (47B65) Operator matrices (47A08)

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