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充要条件是一种比较简单的思维逻辑 ,也是重要的数学概念 ,它主要讨论命题的条件和结论的关系 ,是理解、掌握一个命题的题设和结论的关系及四种命题之间关系的重要工具 ,用处极其广泛 .但老教材却把它安排在解析几何第二章 ,按教学进度 ,这样安排知识偏后 ,对其它知识起不到应
The necessary and sufficient condition is a relatively simple thinking logic, and it is also an important mathematical concept. It mainly discusses the relationship between the conditions of the proposition and the conclusion, and it is the relationship between the understanding and mastering of a propositional title and conclusion and the relationship between the four propositions. The important tools are very useful. However, the old textbooks arranged it in Chapter 2 of Analytic Geometry. According to the progress of teaching, after such arrangement of knowledge, it would not be appropriate for other knowledge.