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Derivatives of the maximum modulus of a starlike function

On derivatives of the maximum modulus of a starlike function
Authors: London, R. R.;

Derivatives of the maximum modulus of a starlike function

Abstract

Let \(f\) be analytic in the unit disk \(D\) and \(M(r,f)=\max\{| f(z)|\mid| z|= r\}\) for \(r\in (0,1)\). In this paper the author describes the very delicate construction of a function \(f\) and a sequence \((r_ n)_{n\in\mathbb{N}}= (r_ n(f))_{n\in\mathbb{N}}\) with the following properties: 1) \(f(0)= f'(0)- 1=0\), \(f\) is starlike in \(D\), 2) \(r_ n\in (0,1)\), \(\lim_{n\to\infty} r_ n=1\), for any \(n\in\mathbb{N}\), \({d^ 2\over dr^ 2} M(r_ n,f)= M''(r_ n,f)\) exists and \[ \lim_{n\to\infty} {(1- r_ n)^ 2 M''(r_ n,f)\over M(r,f)}= \infty. \] Compare: 1) \textit{T. Sheil-Small} [Proc. Lond. Math. Soc., III. Ser. 21, 577-613 (1970; Zbl 0205.383)]; 2) the author [Bull. Lond. Math. Soc. 13, 207-213 (1981; Zbl 0448.30014)].

Related Organizations
Keywords

Special classes of univalent and multivalent functions of one complex variable (starlike, convex, bounded rotation, etc.), Extremal problems for conformal and quasiconformal mappings, other methods, starlike function, regular and starlike in the unit disc, order, maximum modules

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
1
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