Для цитирования:
Prokhorov D. V. Value Regions in Classes of Conformal Mappings [Прохоров Д. В. Области значений в классах конформных отображений] // Известия Саратовского университета. Новая серия. Серия: Математика. Механика. Информатика. 2019. Т. 19, вып. 3. С. 258-279. DOI: 10.18500/1816-9791-2019-19-3-258-279, EDN: VBBALE
Value Regions in Classes of Conformal Mappings
[Области значений в классах конформных отображений]
Обзор преимущественно посвящен недавним результатам в решении задачи об областях значений в различных классах голоморфных однолистных функций, представимых решениями дифференциальных уравнений Левнера как в радиальной, так и в хордовой версиях. Важно также представить классические и современные методы решения и сравнить их эффективность. Наиболее подробно затронуты методы оптимизации и, в частности, принцип максимума Понтрягина. Областью значений является множество {f(z 0 )} всех возможных значений функционала f 7→ f(z 0 ), где z 0 — это фиксированная точка из верхней полуплоскости в хордовом случае или в единичном круге в радиальном случае, а f пробегает класс конформных отображений. Решения дифференциальных уравнений Левнера образуют плотные подклассы рассматриваемых семейств функций. Области значений коэффициентов {(a 2 ,...,a n ) : f(z) = z+ P ∞ n=2 a n zn }, |z| < 1, составляют часть поля исследований, тесно связанного с экстремальными задачами и с гипотезой Бомбиери о структуре области значений коэффициентов на классе S в окрестности точки (2,...,n), соответствующей функции Кебе.
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