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The study of computational complexity is not just about solving problems, but also about understanding the limits of what can be computed.

The challenge is to make the invisible visible.

The opposite of the religious fanatic is not the fanatical atheist but the gentle cynic who cares not whether there is a God or not. The atheist is a religious person. He believes in atheism as though it were a new religion.

Combinatorics is like the art of counting without actually counting.

The deepest theorems often arise from the simplest observations.