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

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• Rongfang Li
• Deyu Wu
• Alatancang Chen

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• Primary
• 47A12

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

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