Dergiler / Mathematical Sciences and Applications E-Notes / 2023 / Cilt: 11 Sayı: 4

Generalized Turan-type Inequalities for Polar Derivative of a Polynomial

Sayfa
178–191
Yayın Tarihi
2023-10-25
DOI
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Besides, our results are also found to generalize and improve some known inequalities.

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Amaç & Hipotez:Let $P(z)=a_0+\sum\limits_{\nu=\mu}^na_{\nu}z^{\nu}$, $1\leq\mu\leq n$, be a polynomial of degree $n$ having all its zeros in $|z|\leq k$, $k\geq 1$.
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Temel Bulgular & Veri:We obtain an improvement and a generalization of an inequality in polar derivative proved by Somsuwan and Nakprasit [1].
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Sonuç & Katkı:Besides, our results are also found to generalize and improve some known inequalities.
🔬Tür:Araştırma Makalesi
📍Kapsam:Genişletilmiş Akademik Örneklem
⚙️Değişkenler:Turan type inequality · Polynomial · Polar Derivative

Abstract

Let $P(z)=a_0+\sum\limits_{\nu=\mu}^na_{\nu}z^{\nu}$, $1\leq\mu\leq n$, be a polynomial of degree $n$ having all its zeros in $|z|\leq k$, $k\geq 1$. We obtain an improvement and a generalization of an inequality in polar derivative proved by Somsuwan and Nakprasit [1]. Further, we also extend a result proved by Chanam and Dewan [2] to its polar version. Besides, our results are also found to generalize and improve some known inequalities.

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Bu Makaleye Atıf Yap

KRİSHNADAS, K., SİNGH, T., CHANAM, B. (2023). Generalized Turan-type Inequalities for Polar Derivative of a Polynomial. Mathematical Sciences and Applications E-Notes, Cilt: 11 Sayı: 4, 178–191. https://ajindex.com/articles/967678

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Kaynakça (13)

  1. Somsuwan, J., Nakprasit, K. M.: Some bounds for the polar derivative of a polynomial. International Journal of Mathematics and Mathematical Sciences. 2018, 5034607 (2018)
  2. Chanam, B., Dewan, K. K.: Inequalities for a polynomial and its derivatives. Journal of Interdisciplinary Mathematics. 11(4), 469-478 (2008)
  3. Bernstein, S.: Lecons sur les propriétés extrémales et la meilleure approximation desfonctions analytiques d’une variable réelle. Gauthier Villars. Paris (1926)
  4. Lax, P. D.: Proof of a conjecture of P. Erdös on the derivative of a polynomial. Bull. Amer. Math. Soc. 50, 509-513 (1944)
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  8. Aziz, A., Rather, N. A.: A refinement of a theorem of Paul Turán concerning polynomials. Mathematical Inequalities and Applications. 1(2), 231-238 (1998)
  9. Dewan, K. K., Upadhye, C. M.: Inequalities for the polar derivative of a polynomial. Journal of Inequalities in Pure and Applied Mathematics. 9(4), 1-9 (2008)
  10. Gardner, R. B., Govil, N. K., Musukala, S. R.: Rate of growth of polynomials not vanishing inside a circle. Journal of Inequalities in Pure and Applied Mathematics. 6(2), 1-9 (2005)
  11. Pólya, G., Szegö, G.: Aufgaben and Lehratze ous der Analysis I (Problems and Theorems in Analysis I). Springer-Verlag. Berlin (1925)
  12. Chanam, B., Dewan, K. K.: Inequalities for a polynomial and its derivatives. J. Math. Anal. Appl. 336, 171-179 (2007)
  13. Qazi, M. A.: On the maximum modulus of polynomials. Proc. Amer. Math. Soc. 115, 337-343 (1992).