
handle: 11583/1401663
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
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
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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