长期来看,风险与回报是相关的。但在短期内,这种关系常常是反常的。
数学研究就是对模式的研究。
The world is a series of broken dams and floods, and my cartoons are tiny little lifeboats.
The study of mathematics is like air or gravity—it is everywhere, and you can't see it, but you know it's there.