Leadership is about making the tough decisions and standing by them.
未来可以通过现在的行动改变。
The essence of mathematics lies in its freedom.
一个好的数学家是能看到定理之间类比的人;一个伟大的数学家是能看到类比之间的类比的人。
Schemas are the building blocks of cognition, organizing our knowledge and guiding our understanding.