你无法回到过去改变开头，但可以从现在开始改变结局。
"You can't go back and change the beginning, but you can start where you are and change the ending."
函数的概念在数学中是基础的，而λ演算试图使这一概念精确化。
People can't do something by themselves; they wanna tell you you can not do it.
Prime numbers are what is left when you have taken all the patterns away. I think prime numbers are like life. They are very logical but you could never work out the rules, even if you spent all your time thinking about them.