自动机和形式语言的研究对于理解计算的极限是基础性的。

学习数学的唯一方法就是做数学。

最好的领导者是那些能够激励他人成为最好的自己的人。

And I hope you will come back here to Harvard 30 years from now and reflect on what you have done with your talent and your energy. I hope you will judge yourselves not on your professional accomplishments alone, but also on how well you have addressed the world's deepest inequities…on how well you treated people a world away who have nothing in common with you but their humanity.

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