On the geometry of numerical ranges

M. Radjabalipour, Heydar Radjavi

Type: Article

Publication Date: 1975-12-01

Citations: 41

DOI: https://doi.org/10.2140/pjm.1975.61.507

Abstract

A bounded convex set G in the plane is the numerical range of an operator on a separable Hubert space if G\G°i s a countable union of arcs of conic sections and singletons.This result answers, in particular, a question raised by Joel Anderson.

Locations

Pacific Journal of Mathematics - View - PDF
Project Euclid (Cornell University) - View - PDF

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