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Abstract

<jats:p>Изложена классическая теорема Рисса-Фейера для тригонометрических многочленов, охарактеризовано множество всех многочленов с положительной в единичном круге действительной частью, дано одно условие единственности такого многочлена и связь этого результата с условием единственности экстремальной функции в проблеме Кшижа. The classical Fejer-Riesz theorem for trigonometric polynomials is expounded, the set of all polynomials with a positive real part in the unit circle is characterized, and one condition for uniqueness of such a polynomial and the connection of this result with the condition for uniqueness of an extremal function in the Krzyz problem is given.</jats:p>

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Keywords

многочленов единственности polynomials condition uniqueness

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