The art of doing mathematics consists in finding that special case which contains all the germs of generality.
做数学的艺术在于找到那个包含所有普遍性萌芽的特殊案例。
A proof tells us where to concentrate our doubts.
现在是过去和未来之间的一座脆弱的桥梁。
The more you hide, the more they look.
晏子春秋