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职业中学数学课本中对集合描述为“集合是指某些具有共同性质的对象的全体”,并规定元素与集合的关系为:(1)如果元素a是集合A的元素,就说“a属于A”,记作a∈A;(2)如果a不是集合A的元素,就说“a不属于A”,记作a∈A。规定集合与集合之间的关系为:(1)集合A是集合B的子集,记作AB;(2)集合A与集合B的交集,记作A∩B;(3)集合A与集合B的并集,记作A∪B;(4)集合A的补集记作A。 教学中要强调学生切勿混淆元素与集合、集合与集合之间的关系。这些“集合语言”用集合符号表示,使用适当既直观又清楚,因
Vocational secondary school mathematics textbook description of the collection as “collection refers to some of the objects with the same nature of the whole” and provides the relationship between the elements and the collection: (1) If the element a is a collection of elements, say “a belongs to A ”, denoted as a∈A; (2) If a is not an element of set A, say“ a does not belong to A ”, denoted as a∈A. (1) Set A is a subset of set B and denoted as AB; (2) The intersection of set A and set B is denoted as A∩B; (3) Set A and set A The union of B, denoted as A∪B; Teaching should emphasize that students should not confuse the relationship between elements and collections, collections and collections. These “collection of language” with the assembly symbol that the use of both intuitive and clear, because