A proof is a device for convincing someone else that a mathematical statement is true.
证明是一种用于使他人相信数学陈述为真的工具。
你无法控制一切,但你可以控制自己对事情的反应。
你能做的最好的投资就是投资自己。
"To understand the present, we must listen to the voices of the past."
"The past is always tense, the future perfect."
You don’t have to get it perfect, you just have to get it going.