On two properties of the numerical range of a bounded Hilbert space operator

Autores: Jaime Rodríguez Montes
Localización: Revista Colombiana de Matemáticas, ISSN-e 0034-7426, Vol. 28, Nº. 2, 1994, págs. 83-91
Idioma: inglés
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Resumen
- Necessary and sufficient conditions are given for the numerical range of a bounded Hilbert space operator to have an empty interior. A sufficient condition for this set to be open is also established.