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Sometimes the most profound mathematics comes from playing with simple ideas until they reveal their hidden complexity.

我不害怕風暴，因為我正在學習如何駕駛我的船。

Profit and purpose are not opposites—they're the twin engines of 21st century business.

La musique est le bruit qui pense.

I look back on the past, committed a felony little fool, I want to communicate with him and let him understand, but I can't do this, the boy would not see the, only my old trunk.

The concept of polynomial-time reduction is central to understanding the structure of NP-complete problems.