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Ratio Numerical Ranges of Operators

✍ Scribed by Leiba Rodman; Ilya M. Spitkovsky


Publisher
SP Birkhäuser Verlag Basel
Year
2011
Tongue
English
Weight
224 KB
Volume
71
Category
Article
ISSN
0378-620X

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📜 SIMILAR VOLUMES


The Numerical Ranges of Automorphic Comp
✍ Paul S. Bourdon; Joel H. Shapiro 📂 Article 📅 2000 🏛 Elsevier Science 🌐 English ⚖ 136 KB

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