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研究了函数的一阶及二阶右导数与函数凸性的关系，推广了数学分析中的有关结果。
Then it expands the B-vex functions by defining connected pseudo B-vex and connected quasi B-vex functions in terms of right upper derivative with respect to an arc.
研究了函数的一阶右导数与函数凸性的关系，给出了二个定理，把曲线凸性判定定理加以推广。
This paper discusses the relationship between the 1-stage progressive derivative and function convex, and two principles are presented, the curve convex judging principle is finally extended.
由一错例引出了讨论导函数在分段点处的左、右极限与对应函数的左、右导数相等的分段函数在分段点处导数的一种求法。
A false example is given to educe the discussion of a solution to the derivative of subsection function at the point of subsection.
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