ABSTRACT
This note complements and improves a norm inequality for accretive-dissipative matrices recently obtained by Kittaneh and Sakkijha. We provide two different extensions. Our proofs feature the effectiveness of a matrix decomposition for sector matrices.
Acknowledgments
We are grateful to the referee for valuable comments, and in particular, for pointing out [Citation20].
Disclosure statement
No potential conflict of interest was reported by the authors.