斯图姆是一位很了不起的法国数学家,在数学的许多领域都做过开创性的工作。一次,斯图姆去参加一个国际学术会议,一位朋友向他请教以下的问题:每天中午有一艘轮船从哈佛开往纽约,且每天同一时刻也有一艘轮船从纽约开往哈佛,轮船在途中均要航行七天七夜。试问,每艘从哈佛开出后的轮船在到达纽约前能遇上几艘从纽约开来的轮船? Sturm, a fantastic French mathematician, has done groundbreaking work in many areas of mathematics. Once, Sturm went to attend an international academic conference. A friend asked him the following questions: There was a ship departing every day at noon from Harvard to New York, and at the same time every day a ship sailed from New York to Harvard. The ship was en route Have to sail seven days and nights. Ask each ship that departed from Harvard before meeting New York to meet a few ships coming from New York?