On Norm Estimates for Derivations in Norm-Attainable Classes

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J. Z. Nyabonyi
N. B. Okelo
R. K. Obogi


In this note, we provide detailed characterization of operators in terms of norm-attainability and norm estimates in Banach algebras. In particular, we establish the necessary and sufficient conditions for norm-attainability of the derivations and also give their norm bounds in the norm-attainable classes.

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