On the δ-numerical radius and the δ-Crawford number functions of direct sum of Hilbert space operators

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• Zameddin I. Ismailov
• Pembe Ipek Al

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• 47A12
• 47A30
• 47A63
• 15A60

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• δ-numerical radius
• δ-Crawford number
• direct sum of Hilbert space operators
• sectorial operator

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