In the fourth and fifth chapters of this paper , we discuss the schwarzian derivatives of analytic functions , the nehari families and the extremal set of schwarzian derivatives , and apply the obtained results to determine the inner radius of univalence of rectangles and hexagons with equal angles 在第四章和第五章中,對解析函數(shù)的schwarz導(dǎo)數(shù)和nehari族以及schwarz導(dǎo)數(shù)的極值集作了深入細(xì)致的研究,并且利用所得到的結(jié)果研究了矩形、等角六邊形的單葉性內(nèi)徑問題。