关于曲线拐点的判别法

On the Criterion Methods of Inflection

否定了文[1]中的定理C,并且对定理1进行了修改,通过对不同教材中拐点的判别法进行比较、分析,给出了一些拐点较为恰当的判别法.

In this paper, we point out that theorem C in the paper[ 1 ] is not correct. And also we give a modified result for the theorem 1 of paper [ 1 ]. By comparing and analyzing different discriminating methods of the inflection point appeared in some textbooks, some proper discriminating methods on the inflection point is given.