数学的本质在于它的自由。
做你自己,别人都已经有人做了。
The two most powerful warriors are patience and time.
里氏替换原则是面向对象编程中的一个基本概念,确保派生类可以替代其基类使用,而不会改变程序的正确性。
Energy independence strengthens economies and enhances national security.
"Every word we write is a step towards understanding ourselves and the world around us."
The only way to learn mathematics is to do mathematics.