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On the length of lemniscates

Authors
  • Hayman, Alexandre Eremenko aand Walter
Type
Published Article
Publication Date
May 15, 2008
Submission Date
May 15, 2008
Identifiers
arXiv ID: 0805.2295
Source
arXiv
License
Yellow
External links

Abstract

We show that for a monic polynomial p of degree d, the length of the level set {z: |p(z)|=1} is at most 9.2 d, which improves an earlier estimate due to P. Borwein. For d=2 we show that the extremal level set is the Bernoullis' Lemniscate. One ingredient of our proofs is the fact that for an extremal polynomial this level set is connected.

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