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引言本文所提出的问题是近年来我所接触到的中等学校教师们及在中学进行教育实习的同学们所要求澄清的。虽然有的问题早已不新鲜了,已完全解决了,但既还有人提出,就不妨再谈谈并试用新的力式来处理它们。有的问题可能分别有人要专文研讨,但既已遭遇到,我不妨先简单的介绍一下,把个人的意见提出作为参考,以便抛砖引玉。这些问题的性质虽不相同,这里却用闭合性和可乘函数的概念把它们贯串起来,以加强整篇文字的组织性。
INTRODUCTION The questions raised in this paper are clarified by the secondary school teachers I have been exposed to in recent years and the students who have been teaching internships in secondary schools. Although some of the problems are long overdue and have been completely resolved, as long as there are people who have proposed it, we may wish to talk about it and try new ways to deal with them. Some of the problems may be that some people have to discuss the article, but have already encountered, I may wish to briefly introduce it, put forward the personal views as a reference, in order to initiate. Although the nature of these problems is not the same, here we use the concept of closedness and multiplicative functions to link them together to enhance the organization of the entire text.