To gain sevrial decision method of convex (concave) function by the definition of convex(concave) function and Taylor formula.

利用凸（凹）函数的定义和泰勒公式给出了凸（凹）函数的几个判别法。

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There are convex function and concave function, Which are of expansive application in many aspects, especially in inequality proof and error estimate.

凸(凹)函数有很多特性，这些性质可广泛应用于不等式的证明及误差估计等方面。

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This paper discusses the relationship between quasi-concave and pseudo-convex in the generalized convex function in the Linear topological space and offers some conditions of equivalence.

讨论了线性拓扑空间上广义凸函数中的拟凸与伪凸之间的关系，并给出它们之间的一些等价条件。

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