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Ural Mathematical Journal, 2024, Volume 10, Issue 2, Pages 131–143
DOI: https://doi.org/10.15826/umj.2024.2.012
(Mi umj240)
 

Integral analogue of Turán-type inequalities concerning the polar derivative of a polynomial

Mayanglambam Singhajit Singh, Barchand Chanam

National Institute of Technology Manipur
References:
Abstract: If $w(\zeta)$ is a polynomial of degree $n$ with all its zeros in $|\zeta|\leq \Delta,$ $\Delta\geq 1$ and any real $\gamma\geq 1$, Aziz
proved the integral inequality [1]

\begin{equation*} \left\lbrace\int_{0}^{2\pi}\left|1+\Delta^ne^{i\theta}\right|^{\gamma}d\theta\right\rbrace^{{1}/{\gamma}}\max_{|\zeta|=1}|w^{\prime}(\zeta)|\geq n\left\lbrace\int_{0}^{2\pi}\left|w\left(e^{i\theta}\right)\right|^{\gamma}d\theta\right\rbrace^{{1}/{\gamma}}. \end{equation*}

In this article, we establish a refined extension of the above integral inequality by using the polar derivative instead of the ordinary derivative consisting of the leading coefficient and the constant term of the polynomial. Besides, our result also yields other intriguing inequalities as special cases.
Keywords: Polar derivative, Turán-type inequalities, Integral inequalities
Bibliographic databases:
Document Type: Article
Language: English
Citation: Mayanglambam Singhajit Singh, Barchand Chanam, “Integral analogue of Turán-type inequalities concerning the polar derivative of a polynomial”, Ural Math. J., 10:2 (2024), 131–143
Citation in format AMSBIB
\Bibitem{SinCha24}
\by Mayanglambam~Singhajit~Singh, Barchand~Chanam
\paper Integral analogue of Tur\'an-type inequalities concerning the polar derivative of a polynomial
\jour Ural Math. J.
\yr 2024
\vol 10
\issue 2
\pages 131--143
\mathnet{http://mi.mathnet.ru/umj240}
\crossref{https://doi.org/10.15826/umj.2024.2.012}
\elib{https://elibrary.ru/item.asp?id=79561215}
\edn{https://elibrary.ru/DFQKXB}
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