NP完全性的概念為理解問題的復雜性提供了一個強大的工具。
Law is nothing else than an ordinance of reason for the common good， made by him who has care of the community.
Great leaders listen more than they speak.
【譯文】一輩子不做不應該做的事，世界上就不會有痛恨自己的人了。
Literature is the memory of humanity, and without it, we are lost.
Paper has been the carrier of human knowledge for centuries. Our duty is to ensure it continues for centuries more.