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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一是函数的拟凸性、伪凸性及其次微分的拟单调性、伪单调性；

One is quasi-convexity and pseudo convexity of functions and quasimonotonicity and pseu-domonotonicity of their sub differentials .

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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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