The numerical range of 2-dimensional Krein spaces operators

• Author(s): Nakazato, Hiroshi ; Bebiano, Natália ; Providência, João da
• Date: 2006
• Persistent ID: http://hdl.handle.net/10316/11374
• Origin: Estudo Geral - Universidade de Coimbra
• Subject(s): Numerical range; Generalized numerical range; Inde nite inner product space
• Document Type: Preprint
• Language: English

Description

The tracial numerical range of operators on a 2-dimensional Krein space is investigated. Results in the vein of those obtained in the context of Hilbert spaces are stated