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Erschienen in: Journal of Inequalities and Applications 1/2006

Open Access 01.12.2006 | Research Article

On the derivative and maximum modulus of a polynomial

verfasst von: K. K. Dewan, N. K. Govil, Abdullah Mir, M. S. Pukhta

Erschienen in: Journal of Inequalities and Applications | Ausgabe 1/2006

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Abstract

If https://static-content.springer.com/image/art%3A10.1155%2FJIA%2F2006%2F54816/MediaObjects/13660_2004_Article_1611_IEq1_HTML.gif is a polynomial of degree https://static-content.springer.com/image/art%3A10.1155%2FJIA%2F2006%2F54816/MediaObjects/13660_2004_Article_1611_IEq2_HTML.gif , having all its zeros in https://static-content.springer.com/image/art%3A10.1155%2FJIA%2F2006%2F54816/MediaObjects/13660_2004_Article_1611_IEq3_HTML.gif , then it was proved by Turán that https://static-content.springer.com/image/art%3A10.1155%2FJIA%2F2006%2F54816/MediaObjects/13660_2004_Article_1611_IEq4_HTML.gif . This result of Turán was generalized by Govil, who proved that if https://static-content.springer.com/image/art%3A10.1155%2FJIA%2F2006%2F54816/MediaObjects/13660_2004_Article_1611_IEq5_HTML.gif has all its zeros in https://static-content.springer.com/image/art%3A10.1155%2FJIA%2F2006%2F54816/MediaObjects/13660_2004_Article_1611_IEq6_HTML.gif , https://static-content.springer.com/image/art%3A10.1155%2FJIA%2F2006%2F54816/MediaObjects/13660_2004_Article_1611_IEq7_HTML.gif , then https://static-content.springer.com/image/art%3A10.1155%2FJIA%2F2006%2F54816/MediaObjects/13660_2004_Article_1611_IEq8_HTML.gif , https://static-content.springer.com/image/art%3A10.1155%2FJIA%2F2006%2F54816/MediaObjects/13660_2004_Article_1611_IEq9_HTML.gif . In this paper, we sharpen this, and some other related results.

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Metadaten
Titel
On the derivative and maximum modulus of a polynomial
verfasst von
K. K. Dewan
N. K. Govil
Abdullah Mir
M. S. Pukhta
Publikationsdatum
01.12.2006
Verlag
Springer International Publishing
Erschienen in
Journal of Inequalities and Applications / Ausgabe 1/2006
Elektronische ISSN: 1029-242X
DOI
https://doi.org/10.1155/JIA/2006/54816

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