Every artist dips his brush in his own soul, and paints his own nature into his pictures.
"The thing about smart people is that they seem like crazy people to dumb people."
理解布莱克-斯科尔斯模型的关键在于认识到它是基于风险中性世界的概念，在这个世界中投资者对风险漠不关心。
引力的存在是最明显的实验事实，但从理论角度来看，它是最神秘的力量。
If you lose or forget to bring a cable，adapter or charger，check with your hotel. Most hotels now have a drawer full of cables，adapters and chargers others have left behind，and probably have the one you are missing. You can often claim it after borrowing it.