Every problem in NP can be reduced to the satisfiability problem, which is the cornerstone of computational complexity theory.
"I have come to believe that a great teacher is a great artist and that there are as few as there are any other great artists. Teaching might even be the greatest of the arts since the medium is the human mind and spirit."
The best way to predict the future is to invent it.
交换、交易和互换的倾向普遍存在于所有人之中,而在其他动物种族中找不到。
人生最幸福的事,就是做自己喜欢做的事。