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After doing nearly all the coursework for a Ph.D. in math, I then did all the coursework for a Ph.D. in statistics and completed that degree.
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revised 
Average probability that a random cosine polynomial with bernoulli coefficients is small
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4h

revised 
Average probability that a random cosine polynomial with bernoulli coefficients is small
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Mar 25 
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Uninteresting questions with interesting answers
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Mar 25 
revised 
Uninteresting questions with interesting answers
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Mar 25 
awarded  Notable Question 
Mar 25 
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Uninteresting questions with interesting answers
Probably. @BenjaminSteinberg ${}\qquad{}$ 
Mar 24 
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Uninteresting questions with interesting answers
@ToddTrimble : My posting says, in the first sentence in the second paragraph "Doubtless it's an interesting problem, to those who are interested in that sort of thing; otherwise Hilbert would not have included it in his list." That says it. But I was saying that even those who take no particular interest in that sort of thing can find Matiyasevich's theorem interesting because of the surprising nature of the result: that there are no semidecidable sets except diophantine sets. 
Mar 24 
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Uninteresting questions with interesting answers
@Ryan : I don't think it's a precise definition with "may". And I state explictly in my posting that a set is decidable if and only if both it and its complement are semidecidable, so that makes it clear if it weren't already that every decidable set is semidecidable. That all decidable sets are semidecidable is an easy exercise. ${}\qquad{}$ 
Mar 24 
awarded  Good Question 
Mar 24 
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Uninteresting questions with interesting answers
There is also a Wikipedia article, originally created by me: en.wikipedia.org/wiki/Proof_that_22/7_exceeds_%CF%80 ${}\qquad{}$ 
Mar 24 
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Uninteresting questions with interesting answers
@BenjaminSteinberg : OK, so your point is simply to agree with my second paragraph? 
Mar 24 
answered  Uninteresting questions with interesting answers 
Mar 24 
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Uninteresting questions with interesting answers
There seem to be lots of problems in geometry, including this one, and the one in my posted question and the napkin ring problem, and others that escape me at the moment, that seem essentially the same as each other in all respects except the specifics. ${}\qquad{}$ 
Mar 24 
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Uninteresting questions with interesting answers
fixing a typo 
Mar 24 
awarded  Popular Question 
Mar 24 
awarded  Nice Question 
Mar 24 
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Uninteresting questions with interesting answers
That one actually crossed my mind while I pondered this question, but at the moment of posting it I had forgotten it. ${}\qquad{}$ 
Mar 24 
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Uninteresting questions with interesting answers
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Mar 24 
asked  Uninteresting questions with interesting answers 
Mar 23 
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why is it so cool to square numbers? (in terms of finding the standard deviation)
@Avicenna : I think your comment is silly. Obviously the sum of all deviations from the mean is zero. The obvious alternative to squaring the deviations is not just leaving them alone; it's taking their absolute values, since those are the distances from the observations to the mean. 