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mar 25 at 2:38In a group of 6 people either we have 3 mutual friends or 3 mutual enemies. In a room of n people?
nov 17 at 15:07If $f(xy)=f(x)f(y)$ then show that $f(x) = x^t$ for some t
jun 8 '12 at 16:25How to understand and appreciate the prime number industry?