数学之美不仅在于其抽象的优雅,还在于其建模和解决现实世界问题的深刻能力。
True irreverence is disrespect for another man's god.
Those who do not remember the past are condemned to repeat it.
The world is a place of the living, and the dead have no place in it. The dead are nothing. They are not even a memory. They are forgotten.