Operators and Matrices · Volume 15, Issue 4

Some general quadratic numerical radius inequalities for the off-diagonal parts of 2 ⨉ 2 block operator matrices

15-89 Pages 1427-1444 DOI 10.7153/oam-2021-15-89

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Authors

Rongfang Li Deyu Wu Alatancang Chen

Keywords

bounded block operator matrix quadratic numerical range quadratic numerical radius mixed Schwarz inequality Young's inequality Jensen inequality

Subject classes

47A12