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A Family of Meromorphic Univalent Functions

机译:亚纯单价函数族

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In this paper, we consider a family of functions that are meromorphic and univalent in the unit disk Δ = {z ∈ C: ∣z∣ < 1} and that have some rather striking geometric properties. These functions all have the form μ(z)=1/z+Σ from k=1 to n of a_kz~k with ∣a_n∣=1. It is well known that if μ given above is univalent in the disk then 0≠μ'(z)=-1/(z~2)+Σ from k=1 to n of ka_kz~(k-1)=-1/(z~2)(1-Σ from k=1 to n of ka_kz~(k+1)). Therefore, ∣ na_n ∣ ≤ 1 and equality is possible only if all zeros of - z~2μ'(z) lie on the circle {∣z∣ = 1}. In that case, a_(n-1) = 0 and (k - 1)a_(k-1) = -na_n(n - k)a_(n-k) [1, p. 166; 2, p. 10]. We will call a function given by a meromorphic polynomial of degree n.
机译:在本文中,我们考虑一族函数,​​它们在单位圆盘Δ= {z∈C:∣z∣ <1}中是亚纯的并且是单价的,并且具有一些相当惊人的几何特性。这些函数在a_kz〜k的k = 1到n之间具有(a_n∣ = 1 / n)的形式为μ(z)= 1 / z +Σ。众所周知,如果上面给出的μ在磁盘中是单价的,则从k = 1至ka_kz〜(k-1)=-1的n为0≠μ'(z)=-1 /(z〜2)+Σ /(z〜2)(从k = 1到ka_kz〜(k + 1)的n的1-Σ)。因此,∣ na_n ∣≤1,并且仅当-z〜2μ'(z)的所有零都位于圆{∣z∣ = 1}上时,相等才是可能的。在这种情况下,a_(n-1)= 0且(k-1)a_(k-1)= -na_n(n-k)a_(n-k)[1,p。 166; 2,第10]。我们将调用由度为n的亚纯多项式给出的函数。

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