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Norm of an Operator with Numerical Range in a Sector by Li, Chi-Kwong; Wang, Kuo-Zhong is a scholarly article available to read on EtoBox.

What is Norm of an Operator with Numerical Range in a Sector about?

We refine a recent result of Drury concerning the optimal ratio between the norm and numerical radius of a bounded linear operator $T$ with numerical range lying in a sector of a circular disk. In particular, characterization is given to the operators attaining the optimal ratio, and properties of such operators are explored.

Author

Li, Chi-Kwong; Wang, Kuo-Zhong

Published

2024

Language

EN