"Suppose aliens invade the earth and threaten to obliterate it in a year's time unless human beings can find the Ramsey number for red five and blue five. We could marshal the world's best minds and fastest computers, and within a year we could probably calculate the value. If the aliens demanded the Ramsey number for red six and blue six, however, we would have no choice but to launch a preemptive attack."
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As quoted in "Ramsey Theory" by Ronald L. Graham and Joel H. Spencer, in Scientific American (July 1990), p. 112-117
https://en.wikiquote.org/wiki/Paul_Erd%C5%91s
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Paul Erdős
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