On a lemma of Ruscheweyh (Q1970261)
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scientific article; zbMATH DE number 1417950
| Language | Label | Description | Also known as |
|---|---|---|---|
| English | On a lemma of Ruscheweyh |
scientific article; zbMATH DE number 1417950 |
Statements
On a lemma of Ruscheweyh (English)
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18 January 2001
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Let \(f\) be an analytic function in the unit disk, \(f(0)=0\), and \(f'\) is the \((1+b)\)th power of the Schwarz kernel. The paper is devoted to proving that \(f\) is not starlike if \(b>0\). The motivation for the study is a lemma of Ruscheweyh.
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starlike functions
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typically real functions
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subordination
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0.7617497444152832
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