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Proceedings of the American Mathematical Society
Proceedings of the American Mathematical Society
ISSN 1088-6826(online) ISSN 0002-9939(print)

 

A simple proof of the elliptical range theorem


Author: Chi-Kwong Li
Journal: Proc. Amer. Math. Soc. 124 (1996), 1985-1986
MSC (1991): Primary 15A60
MathSciNet review: 1322932
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Abstract: A short proof is given of the elliptical range theorem concerning the numerical range of a $2\times 2$ complex matrix.


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Additional Information

Chi-Kwong Li
Affiliation: Department of Mathematics, College of William and Mary, Williamsburg, Virginia 23187
Email: ckli@cs.wm.edu

DOI: http://dx.doi.org/10.1090/S0002-9939-96-03307-2
PII: S 0002-9939(96)03307-2
Keywords: Numerical range
Received by editor(s): January 17, 1995
Additional Notes: This research was supported in part by a NATO grant.
Communicated by: Palle E. T. Jorgensen
Article copyright: © Copyright 1996 American Mathematical Society