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On the growth of polynomials

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In this paper, we study the growth of polynomials $P(z)$ of degree $n$ defined by $P(z)=z^s(a_0+\sum\limits_{j=t}^{n-s}a_j z^j),\quad t\geq 1,\quad 0\leq s\leq n-1$ which do not vanish in the disk $|z|\leq k, \quad k\geq 1$ except for the $s$-fold zeros at origin. Our result generalises and refines many results known in the literature.

Abstract

In this paper, we study the growth of polynomials $P(z)$ of degree $n$ defined by $P(z)=z^s(a_0+\sum\limits_{j=t}^{n-s}a_j z^j),\quad t\geq 1,\quad 0\leq s\leq n-1$ which do not vanish in the disk $|z|\leq k, \quad k\geq 1$ except for the $s$-fold zeros at origin. Our result generalises and refines many results known in the literature.

참고문헌 (9)

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  2. A. Dalal, "On sharpening of a Theorem of Ankeny and Rivilin", Anal. Theory Appl, 36, pp.225~234 (2018)
  3. R. B. Gardner, "Rate of growth of polynomials not vanishing inside a circle", J. Ineq. Pure Appl. Math, 6 (2005)
  4. R. B. Gardner, "Growth of polynomial not vanishing inside a circle", Int. J. Pure Appl. Math, 13, pp.487~494 (2004)
  5. N. K. Govil, "On the maximum modulus of polynomials not vanishing inside the unit circle", Approx. Theory Appl, 5, pp.79~82 (1989)
  6. N. K. Govil, "On the growth of polynomials", J. Ineq. Appl, 7, pp.623~631 (2002)
  7. N. K. Govil, "Inequalities describing the growth of polynomialsnot vanishing in a disk of prescribed radius", Math. Inequal. Appl, 6, pp.491~498 (2003)
  8. E. Khojastehnezhad, "Generalisation of some inequalities for the polar derivative of polynomials with restricted zeros", TWMS J. App. Eng. Math, 9, pp.485~492 (2019)
  9. M. Riesz, "Uber einen Satz des Herrn Serge Bernstein ¨", Acta. Math, 40, pp.337~347 (1916)

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