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如果两个有限数集相等或一个有限数集有两种表示方法,那么,由集合相等的定义容易证得:①两个集合元素个数相等;②两个集合所有元素之和相等;③两个集合所有元素之积等.下面举例说明这个性质的应用.
If two finite number sets are equal or a finite number set has two kinds of representation methods, then it is easy to obtain the definition of the same set: ① The number of the two set elements is equal; ② The sum of all the elements of the two sets is equal; ③ Two A set of all the elements of the product, etc. The following examples illustrate the application of this property.