✦ LIBER ✦
On the sequences of the Weyl semi-radii associated with matricial Carathéodory and Schur sequences in both nondegenerate and degenerate cases
✍ Scribed by Bernd Fritzsche; Bernd Kirstein; Uwe Raabe
- Publisher
- Elsevier Science
- Year
- 2011
- Tongue
- English
- Weight
- 447 KB
- Volume
- 435
- Category
- Article
- ISSN
- 0024-3795
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✦ Synopsis
In this paper we discuss Weyl matrix balls in the context of the matricial versions of the classical interpolation problems named after Carathéodory and Schur. Our particular focus will be on studying the monotonicity of suitably normalized semi-radii of the corresponding Weyl matrix balls. We, furthermore, devote a fair bit of attention to characterizing the case in which equality holds for particular matricial inequalities. Solving these problems will provide us with a new perspective on the role of the central functions for the classes of Carathéodory and Schur.