本刊1981年第3辑刊登了《一些初等方法求极值的依据及局限性》一文,作者指出,初等方法所求极值实际上都是“最值”,即“双重极值”,并给出了一个判定双重极值的定理。作者认为,对于那些是极值而不是最值的点,一些初等方法就难以奏效了,这就显示出了这些初等方法的局限性。最近我们陆续收到一些来稿,与该文的作者讨论。现在摘登三篇。此外,作者要编辑部向来稿同志表示感谢。 In the 3rd issue of the 1981 issue of the article “The basis and limitations of some elementary methods for seeking extremum”, the author pointed out that the extremum sought by the elementary method is actually the “most value”, ie “double extremum”, and A theorem for determining double extremes is given. The author believes that some elementary methods are not effective for those points that are extreme values ​​rather than the most, which shows the limitations of these elementary methods. Recently, we have received several submissions in succession and discussed with the authors of the article. Now pick out three articles. In addition, the author wants the editorial department to express gratitude to the comrades of the submissions.