2 papers
math.FA2026
Harnack parts for 5-by-5 truncated shift with numerical radius one
Mohammed Benharrat
We provide a complete description of the Harnack part for normalized truncated shift of size five with numerical radius one. We prove that any operator in this Harnack component mu…
math.FA2026
Some Sharp bounds for the generalized Davis-Wielandt radius
Mehdi Naimi, Mohammed Benharrat, Faouzi Hireche
This paper presents a study of the generalized Davis-Wielandt radius of Hilbert space operators. New lower bounds for the generalized Davis-Wielandt radius and numerical radius are…