Extreme values of the derivative of Blaschke products and hypergeometric polynomials
Extreme values of the derivative of Blaschke products and hypergeometric polynomials
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Blaschke 乘积和超几何多项式的导数的极值
DOI:
10.1016/j.bulsci.2021.102979
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发表时间:
2021
期刊:
影响因子:
--
通讯作者:
Yang, Xuerui
中科院分区:
文献类型:
--
作者:
Kovalev, Leonid V.;Yang, Xuerui
A finite Blaschke product, restricted to the unit circle, is a smooth covering map. The maximum and minimum values of the derivative of this map reflect the geometry of the Blaschke product. We identify two classes of extremal Blaschke products: those that maximize the difference between the maximum and minimum of the derivative, and those that minimize it. Both classes turn out to have the same algebraic structure, being the quotient of two hypergeometric polynomials.
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作者:
Kovalev, Leonid V.;Yang, Xuerui
通讯作者:
Yang, Xuerui