Dergiler / Communications Faculty of Sciences University of Ankara Series A1: Mathematics and Statistics / 2020 / Cilt: 69 - Sayı: 2
SOME NUMERICAL CHARACTERISTICS OF DIRECT SUM OF OPERATORS
- Sayfa
- 1221–1227
- DOI
- —
Abstract
The connection between some numerical characteristics (numerical range, numerical radius, Crawford number and sectoriality) of direct sumof operators in the direct sum of Hilbert spaces and their coordinate operatorshas been investigated.