Local structure of trajectory for extremal functions
Bull. Korean Math. Soc. 1999 Vol. 36, No. 3, 609-619
Suk Young Lee
Ewha Womans University
Abstract : In this note we study more about the omitted arc for the extremal functions and its $\pi \over 4$-property based upon Schiffer's variational method and Brickman-Wilken's result. We give an example other than the Koebe function which is both a support point of $S$ and the extreme point of $HS$. Furthermore, we discuss the relations between the support points and the L\"owner chain.
Keywords : slit mapping, trajectories, support points, extreme points
MSC numbers : Primary 30C45
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