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On the Koebe Quarter Theorem for certain polynomials
Analysis and Mathematical Physics ( IF 1.7 ) Pub Date : 2021-02-24 , DOI: 10.1007/s13324-021-00501-8
Szymon Ignaciuk , Maciej Parol

We study problems similar to the Koebe Quarter Theorem for close-to-convex polynomials with all zeros of derivative in \({\mathbb {T}}:=\{z\in {\mathbb {C}}:|z|=1\}\). We found minimal disc containing all images of \({\mathbb {D}}:=\{z\in {\mathbb {C}}: |z|<1\}\) and maximal disc contained in all images of \({\mathbb {D}}\) through polynomials of degree 3 and 4. Moreover we determine the extremal functions for both problems.



中文翻译:

关于某些多项式的Koebe四分理定理

对于\({\ mathbb {T}}:= \ {z \ in {\ mathbb {C}}:| z | =中的所有导数为零的情况,我们研究类似于Koebe四分理的问题。1 \} \)。我们找到了包含\({\ mathbb {D}}:= \ {z \ in {\ mathbb {C}}:| z | <1 \} \)中所有图像的最小光盘,以及包含在\\所有图像中的最大光盘。 ({\ mathbb {D}} \)通过3和4级的多项式。此外,我们确定了这两个问题的极值函数。

更新日期:2021-02-24
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