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A mathematician has spent ten years trying to prove the Riemann hypothesis. Finally, he decides to sell his soul to the devil in exchange for a proof. The devil promises to deliver a proof in the four weeks. Half a year later, the devil shows up again - in a rather gloomy mood. "I'm sorry", he says. "I couldn't prove the hypothesis either. But" - and his face lightens up - "I think I found a really interesting lemma..." Definitions of Terms Commonly Used in Math CLEARLY: I don't want to write down all the in-between steps. RECALL: I shouldn't have to tell you this, but for those of you who erase your memory tapes after every test, here it is again. WITHOUT LOSS OF GENERALITY: I'm not a