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The complexity of a learning problem is often determined by the size and structure of the hypothesis space.

Leadership in the energy sector means making tough decisions today for a better tomorrow.

I don't think that everyone should become a mathematician, but I do believe that many students don't give mathematics a real chance.

計算復雜性的本質是理解什么可以被有效地計算的極限。

The true teacher defends his pupils against his own personal influence. He inspires self-trust. He guides their eyes from himself to the spirit that quickens him. He will have no disciple.