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高中数学试验教材第一册在第一章第一小节集合结束后增添了阅读材料 ,集合元素的个数 ,书中指出 ,一般地 ,对任意两个有限集Ａ ,Ｂ ,有Ｃａｒｄ(Ａ∪Ｂ) =Ｃａｒｄ(Ａ) +Ｃａｒｄ(Ｂ) -Ｃａｒｄ(Ａ∩Ｂ) ,实际上 ,这是关于两个集合的基数公式 ,也是大家熟知的容斥原理 ,更一般
The first volume of the high school mathematics experiment textbook adds the reading material after the collection in the first section of the first chapter, the number of the collection elements, the book points out that, generally, for any two finite sets A, B, there is Card (A∪ B) =Card(A) +Card(B) -Card(A∩B). Actually, this is about the cardinality formula of the two sets. It is also known as the principle of exclusion and is more general.