同一元素的原子在质量和性质上是相同的。
用程序证明四色定理不会改变数学——它只是证明了这个挑战了一个世纪的定理是一个有限的问题。
A proof is a way to convince yourself and others that something is true.
You should be doing something that you're passionate about and that you think is really important.