Fekete–Szegő inequality

In mathematics, the Fekete–Szegő inequality is an inequality for the coefficients of univalent analytic functions found by Fekete and Szegő (1933), related to the Bieberbach conjecture. Finding similar estimates for other classes of functions is called the Fekete–Szegő problem.

The Fekete–Szegő inequality states that if

is a univalent analytic function on the unit disk and , then

References

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  • Fekete, M.; Szegő, G. (1933), "Eine Bemerkung über ungerade schlichte Funktionen", Journal of the London Mathematical Society, 8 (2): 85–89, doi:10.1112/jlms/s1-8.2.85