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A mathematician has spent years trying to prove the Riemann hypothesis – without success. Finally, he decides to sell his soul to the devil in exchange for a proof. The devil promises to deliver a proof within four weeks.
Four weeks pass, but nothing happens. Half a year later, the devil shows up again – in a rather gloomy mood.
“I’m sorry”, he says. “I couldn’t prove the Riemann hypothesis either. But” – and his face lightens up – “I think I found a really interesting lemma…”