The boundary of the numerical range of an operator
โ Scribed by Gerhard Garske
- Publisher
- Elsevier Science
- Year
- 1979
- Tongue
- English
- Weight
- 103 KB
- Volume
- 68
- Category
- Article
- ISSN
- 0022-247X
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๐ SIMILAR VOLUMES
We investigate the shape of the numerical range for composition operators induced on the Hardy space H 2 by conformal automorphisms of the unit disc. We show that usually, but not always, such operators have numerical ranges whose closures are discs centered at the origin. Surprising open questions
The numerical range of an n ร n matrix polynomial , and plays an important role in the study of matrix polynomials. In this paper, we describe a methodology for the illustration of its boundary, โW (P ), using recent theoretical results on numerical ranges and algebraic curves.