本文研究一类广义负系数单叶解析函数，得到了准确的系数估计，偏差定理，凸性半径和星形性半径。

In this paper, we study a generalized class of univalent functions with negative coefficients. Sharp coefficient estimates, distortion theorem and radius of convexity and starlikeness are obtained.

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用集合的近似凸性研究函数的拟凸性。

Quasiconvex functions are studied by applying nearly convexity of sets.

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用集合的近似凸性研究函数的拟凸性。在较弱假设下，获得了拟凸性的一些等价条件。

Quasiconvex functions are studied by applying nearly convexity of sets. Under weaker assumptions, some equivalent conditions for quasiconvexity are derived.

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