Abstract: Many mathematical theorems present with the classic opening words "Given a and (epsilon, is written as a reversed 3) arbitrarily small, it can be shown that ...", where with a little pleasure and is used to indicate a parameter that can reach very small values, but different from zero. Student: "Let the three arbitrarily small, it can be shown that ...". Professor (shocked): "Excuse me? Be given what?". Student: "A three arbitrarily small, no?". Professor: "But look at this (design) is an epsilon, not a three !!!". Student: "Ah, and I think that the correct throughout the book !!!". Professor: "Do something, now go away and come back when he has corrected all again ...".
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