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zbMATH Open
Article . 1988
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Transactions of the American Mathematical Society
Article . 1988 . Peer-reviewed
Data sources: Crossref
Transactions of the American Mathematical Society
Article . 1988 . Peer-reviewed
Data sources: Crossref
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Subordination Families and Extreme Points

Subordination families and extreme points
Authors: Abu-Muhanna, Yusuf; Hallenbeck, David J.;

Subordination Families and Extreme Points

Abstract

Let s ( F ) s(F) denote the set of functions subordinate to a univalent function F F in Δ \Delta the unit disk. Let B 0 {B_0} denote the set of functions ϕ ( z ) \phi (z) analytic in Δ \Delta satisfying | ϕ ( z ) | > 1 |\phi (z)| > 1 and ϕ ( 0 ) = 0 \phi (0) = 0 . We prove that if f = F ∘ ϕ f = F \circ \phi is an extreme point of s ( F ) s(F) , then ϕ \phi is an extreme point of B 0 {B_0} . Let D = F ( s ) D = F(s) and λ ( w , ∂ D ) \lambda (w,\,\partial D) denote the distance between w w and ∂ D \partial D (boundary of D D ). We also prove that if ϕ \phi is an extreme point of B 0 {B_0} and | ϕ ( e i t ) | > 1 |\phi ({e^{it}})| > 1 for almost all t t , then ∫ 0 2 π log ⁡ λ ( F ( ϕ ( e i t ) e i θ ) , ∂ D ) d t = − ∞ \int _0^{2\pi } {\log \lambda (F(\phi ({e^{it}}){e^{i\theta }}),\,\partial D)\,dt = - \infty } for almost all θ \theta .

Keywords

Maximum principle, Schwarz's lemma, Lindelöf principle, analogues and generalizations; subordination, Nevanlinna class, General theory of univalent and multivalent functions of one complex variable, extreme point, subordinate

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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!
7
Average
Top 10%
Average
bronze