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The length of a lemniscate

The length of a lemmiscate
Authors: ELIA, Michele; GALIZIA ANGELI M. T.;

The length of a lemniscate

Abstract

For \(t>0\) and \(n=1,2,...\), let \(L_ n(t)\) denote the length of the lemniscate \(\{\) \(z: | z^ n-1| =t\}\). The lemniscate consists of n components if \(01\). It is natural to ask whether \(L_ n(t)\) is an increasing function of t for each n. Since \(L_ 1(t)=2\pi t\), the answer is affirmative for \(n=1\). \textit{G. Piranian} [Am. Math. Mon. 87, 550-556 (1980; Zbl 0468.30005)] used elementary estimates to give negative answers for the cases \(n=4,5,...\), and invited consideration of the cases \(n=2\) and 3, as well as of other open questions. The present paper addresses and settles several of these questions. 1. \(L_ n(1)\) is given explicitly by a formula involving the gamma function, and is asymptotically equal to 2n. 2. \(L_ 2(t)\) can be evaluated by use of an elliptic integral. 3. For \(n=2,3,...\), \(L_ n(t)\) is increasing for \(0

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Italy
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Keywords

Asymptotic representations in the complex plane, Polynomials and rational functions of one complex variable, elliptic integral, lemniscate, Integration of real functions of several variables: length, area, volume, length, Length, area and volume in real or complex geometry

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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!
0
Average
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