Think wrongly, if you please, but in all cases, think for yourself.
I'm not a rebel, I'm just being honest.
数学的真正力量不在于它的复杂性,而在于它的简洁和优雅。
To every action there is always opposed an equal reaction; or, the mutual actions of two bodies upon each other are always equal, and directed to contrary parts.
抽象的目的不是模糊,而是创建一个新的语义层次,在这个层次上可以绝对精确。