集合、简易逻辑

• 作 者: 肖新才
• 机 构: 武汉市一中 湖北武汉430079
• 出 处: 数学通讯
• 发表日期: 2005年Z1期
• 关键词: 逆否命题 逻辑联结词 空集 恒成立 原命题 解集 无限集 关系判断 补集 实数解

1　本单元知识网络学习集合要注意元素的“三性”———确定性 ,互异性与无序性 ,要注意空集的特殊性 ,要注意符号“∈”与“ ”、“ ”的区别 ,要注意求补集的前提 ,要注意使用Venn图直观表达集合的关系及运算 .判断充要条件除了“定义法”外 ,还要注意使用“逆否法”、“集

1 The unit knowledge network learning collection should pay attention to the “three properties” of elements—determination, mutuality, and disorder. Attention should be paid to the particularity of the empty set. Attention should be paid to the difference between symbols “∈” and “ ” and “ ”. It is necessary to pay attention to the premise of complementation. Attention should be paid to the use of Venn diagrams to intuitively express the relations and operations of collections. Judging the necessary and necessary conditions in addition to the “definition method”, we must also pay attention to the use of “backwards” and “sets.”