On Generalized Numerical Ranges of Operators on an Indefinite Inner Product Space
Natália Bebiano, Rute Lemos, João da Providência, Graça Soares · Linear and Multilinear Algebra · 2004
In this article, numerical ranges associated with operators on an indefinite inner product space are investigated. Boundary generating curves, corners, shapes and computer generations of these sets are studied. In particular, the Murnaghan–Kippenhahn theorem for the classical numerical range is generalized.