“关于曲线拐点判别法”一文中若干问题的理论分析

The Theoretical Analysis to Some Problems in the Paper "On the Methods of Judging Point of Inflection"

对文于淑兰提出的判别曲线拐点的两个定理及推论作了充分的研究,指出了定理证明的错误原因,并且否定了其中的一个定理及其推论.

This paper makes a sufficient study about the theorems of Judging point of inflection and corollaries given in paper （YU Shu-lan）. The error reasons of proofs are found, and we also point out that one of the theorems and its corollaries are incorrect.