抽屉原理及其由来抽屉原理又称鸽巢原理:“如果有五个鸽子笼,养鸽人养了6只鸽子,那么当鸽子飞回笼中后,至少有一个笼子中装有2只鸽子.”这个简单的事实就是著名的鸽笼原理,在我们国家更多地称之为抽屉原理,概括起来主要有下面几种形式:原理Ⅰ把多于n个的元素按任一确定的方式分成n个集合,则一定有一个集合中含有两个或两个以上的元素. Drawer principle and its origin drawer principle, also known as the principle of pigeon nest: “If there are five pigeon cages, raising pigeons to raise six pigeons, then when the pigeons fly back into the cage, at least one cage with two pigeons. ”This simple fact is the well-known pigeon-cage principle, more commonly known in our country as the drawer principle, which can be summarized in the following ways: Principle I Divides more than n elements in any given way n sets, there must be a collection contains two or more elements.