Growth of polynomials with prescribed zeros

Abstract

In this paper, we study the growth ofpolynomials of degree $n$ having all their zeros on $|z|=k$,$k\le 1$. Using the notation $M(p,t)=\underset{|z|=t}{max}|p(z)|$, we measure the growth of $p$ by estimating$\{\frac{M(p,t)}{M(p,1)}{\}}^s$ from above for any $t\ge 1$, $s$ being an arbitrary positive integer. Also in this paper weimprove the results recently proved by K. K. Dewan and Arty Ahuja[Growth of polynomials with prescribed zeros, J. Math. Ineq.5 (2011), 355–361].