The human quest for efficiency is ancient and universal. Computational
Complexity Theory is the mathematical study of the efficiency
requirements of computational problems. In this note we attempt to
convey the deep implications and connections of the results and goals
of computational complexity, to the understanding of the most basic
and general questions in science and technology.
In particular, we will explain the P versus NP question of computer
science, and explain the consequences of its possible resolution, P =
NP or P 6= NP, to the power and security of computing, the human
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诗经·陈风

月出


月出皎兮。佼人僚兮。
舒窈纠兮。劳心悄兮。

月出皓兮。佼人懰兮。
舒忧受兮。劳心慅兮。

月出照兮。佼人燎兮。
舒夭绍兮。劳心惨兮。

雨 霖 铃
柳永

寒蝉凄切,对长亭晚，骤雨初歇。
都门帐饮无绪，留恋处、兰舟催发。
执手相看泪眼，竟无语凝噎。
念去去、千里烟波，暮霭沉沉楚天阔。

多情自古伤离别。
更那堪、冷落清秋节。
今宵酒醒何处，杨柳岸、晓风残月。
此去经年，应是良辰、好景虚设。
便纵有、千种风情，更与何人说。