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The study of computational complexity is not just about classifying problems; it is about understanding the nature of computation itself.

物理定律必須以獨立于坐標系選擇的方式表述。

在這個世界上取得成功的人，是那些努力尋找他們想要的環境的人，如果找不到，就自己創造。

Progress is impossible without change, and those who cannot change their minds cannot change anything.

I am convinced that the substitution of a simple tax on the rent of land for the complicated taxes which at present oppress industry would be advantageous to all classes.