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Article . 1973 . Peer-reviewed
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Proceedings of the American Mathematical Society
Article . 1973 . Peer-reviewed
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A Counterexample to the Two-Thirds Conjecture

A counterexample to the two-thirds conjecture
Authors: Barnard, Roger W.; Lewis, John L.;

A Counterexample to the Two-Thirds Conjecture

Abstract

Let w = f ( z ) = z + a 2 z 2 + ⋯ w = f(z) = z + {a_2}{z^2} + \cdots be regular and univalent for | z | > 1 |z| > 1 , and map ⁡ | z | > 1 \operatorname {map} |z| > 1 onto a region which is starlike with respect to w = 0 w = 0 . If r 0 {r_0} denotes the radius of convexity of f ( z ) , d ∗ = min | f ( z ) | f(z),{d^\ast } = \min |f(z)| for | z | = r 0 |z| = {r_0} and d = inf | β | d = \inf |\beta | for which f ( z ) ≠ β f(z) \ne \beta , then it has been conjectured by A. Schild in 1953 that d ∗ / d ≧ 2 3 {d^\ast }/d \geqq \tfrac {2}{3} . It is shown here that this conjecture is false by giving two counter-examples.

Keywords

Special classes of univalent and multivalent functions of one complex variable (starlike, convex, bounded rotation, etc.)

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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!
2
Average
Average
Average
bronze