A theoretical investigation of S-Numerical Range with the respect to a family of projections
Wlat Hamad, Botin Ibrahim · ZANCO Journal of Pure and Applied Sciences · 2022
The idea of the -numerical range of a bounded linear operator on a complex Hilbert space with respect to a family of projections is introduced in this study. We provide a detailed description and discuss its relationship to the -numerical range and generalizations such as product S-numerical range. The significance of this new concept comes from its unifying character.