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集合是整个高中数学的基础,是使用数学语言表述数学问题的基础.集合是集合论中原始的不定义的概念,只能给出对集合概念的描述性说明,即是“某些指定的对象集在一起就构成了一个集合”.集合中的每个对象叫做这个集合的元素,显然“某些对象”可以是“一些数”“一些点”“一些图形”“一些式子”“一些物体”“一些人”等.以“一些数”为指定对象构成的集合叫做数集,以“一些点”为指定对象构成的集合叫做点集.在学习时一定要注意区分这两类特殊的集合.
The set is the basis of the mathematics of the whole high school, and it is the basis of using mathematics to express mathematics problems. The set is the original undefined concept in the set theory, and can only give a descriptive description of the concept of the set, that is, some specified Objects are grouped together to form a collection. Each object in the collection is called the element of this collection. Obviously, some objects can be some numbers, some points, some points, and some graphics. “”Some objects “” Some objects “”Some people“ etc.. A collection of specified objects made of ”some number“ is called a number set, with ”some dots" as the specified object The set of collections is called a set of points. When learning, we must pay attention to distinguish between these two special sets.