
Assume that \(z_0\), \(z_1, \dots, z_n\) belong to an angular region bounded by two rays emanating from the origin, \(\sigma_k (z_0, \dots, z_n) = \sum z_0^{j_0} z_1^{j_1}, \dots, z_n^{j_n}\), \(j_0+j_1 + \cdots + j_n =k\), \(j_s\), \(s=0,1, \dots,n\) being nonnegative integers, stands for a symmetric polynomial, \[ \sigma_k (z,z_1, \dots, z_n) = \sum^k_{m=0} \sigma_m(z_1, \dots, z_n) z^{k-m} {\overset{def}=} P_k(z). \] For fixed \(\varphi, \alpha, \alpha >0\) we set \(D_\varphi (\alpha) = \{z: \varphi< \arg z < \varphi + \alpha\} \). The author established several results concerning the distribution of zeros and univalence. The results have fairly complicated forms. One of the simplest results is as follows: For \(z_s\), \(s = 1,2, \dots,n\) arbitrarily fixed in \(\overline {D_\varphi} (2\pi/k)\), the polynomial \(P_k(z)\) is univalent in \(D_\varphi (2\pi/k)\).
Zeros of polynomials, rational functions, and other analytic functions of one complex variable (e.g., zeros of functions with bounded Dirichlet integral)
Zeros of polynomials, rational functions, and other analytic functions of one complex variable (e.g., zeros of functions with bounded Dirichlet integral)
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