In the last chapter: the author investigates certain kind of harmonic univalent function with negative coefficients and obtain some sufficient-necessary conditions for this new kind function.
第三章：作者研究了某一类负系数的单叶调和函数，得到它的一些充要条件等。
In the last chapter: the author investigates certain kind of harmonic univalent function with negative coefficients and obtain some sufficient-necessary conditions for this new kind function.
第三章：作者研究了某一类负系数的单叶调和函数，得到它的一些充要条件等。
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