On the generalized numerical radii of operators
Khalid Khalid, Khalid Shebraw, Tasnim Alkharabsheh · International Journal of Neutrosophic Science · 2025
It is shown that if A, B,X, and Y are operators acting on a finite dimensional Hilbert space, then. ωu (AXB∗ ± BYA∗) ≤ 2 ∥A∥ ∥B∥ ωu ([0 X, Y 0]) where ωu (T ), ∥T ∥, are, respectively, the U-numerical radius, the spectral norm, of an operator T .