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Numerical range and accretivity of operator products

โœ Scribed by Karl Gustafson; Duggirala Rao


Publisher
Elsevier Science
Year
1977
Tongue
English
Weight
527 KB
Volume
60
Category
Article
ISSN
0022-247X

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๐Ÿ“œ SIMILAR VOLUMES


The numerical range of a product
โœ Richard Bouldin ๐Ÿ“‚ Article ๐Ÿ“… 1970 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 459 KB
The Numerical Ranges of Automorphic Comp
โœ Paul S. Bourdon; Joel H. Shapiro ๐Ÿ“‚ Article ๐Ÿ“… 2000 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 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