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Certain Polynomials with Weighted Sums

  • Received : 2015.06.04
  • Accepted : 2015.06.25
  • Published : 2015.06.30

Abstract

In this note, we provide some examples of polynomials $z^n-p(z)$, where $p(z)={\limits\sum_{k=o}^{n-1}}a_kz^k$, and ${\limits\sum_{k=o}^{n-1}}a_kz^k=1$, $a_k{\geq}0$ for each k such that p(z) has all its zeros on ${\mid}z{\mid}=c<1$, and $z^n-p(z)$ has all its zeros on two circles ${\mid}z{\mid}=1$ and ${\mid}z{\mid}=d<1$.

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References

  1. M. Marden, "Geometry of Polynomials, Mathematical Surveys Number III", American Mathematical Society, Providence, Rhode Island, 1966.
  2. S.-H. Kim, "Polynomials with weighted sum", Publ. Math-Debrecen, Vol. 66, pp. 303-311, 2005.