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 Nov4 revised Does it ever make sense NOT to go to the most prestigious graduate school you can get into? deleted 6 characters in body Nov3 comment Does it ever make sense NOT to go to the most prestigious graduate school you can get into? Excellent point, Noah! Thanks for pointing that out. Nov3 revised Funny identities added 4 characters in body Nov3 answered Funny identities Nov3 answered Funny identities Nov3 answered Funny identities Nov3 revised why have we chosen our number system to be decimal (base 10) edited body Nov3 revised why have we chosen our number system to be decimal (base 10) added 8 characters in body Nov3 comment why have we chosen our number system to be decimal (base 10) Haha. Sure, and, in particular, it makes the deciliter useful. Nov3 comment why have we chosen our number system to be decimal (base 10) Thanks, J.M. ;) Nov3 comment why have we chosen our number system to be decimal (base 10) I suppose the sexagesimal counting didn't include the thumb because it doesn't have 3 natural and visible segments. It is sufficient to use 4 fingers with 3 segments on one hand and all five digits on the other. Nov3 revised why have we chosen our number system to be decimal (base 10) added 25 characters in body; added 9 characters in body; deleted 3 characters in body Nov3 answered why have we chosen our number system to be decimal (base 10) Nov3 comment Riemann Zeta Function and Analytic Continuation I suppose Trevor means the Bernoulli numbers. Nov3 revised How to prove Euler's formula: $e^{it}=\cos t +i\sin t$? added 79 characters in body; added 1 characters in body Nov2 revised Positive integers $k = p_{1}^{r_{1}} \cdots p_{n}^{r_{n}} > 1$ satisfying $\sum_{i = 1}^{n} p_{i}^{-r_{i}} < 1$ deleted 16 characters in body Nov2 revised Sharp upper bounds for sums of the form $\sum_{p \mid k} \frac{1}{p+1}$ added 4 characters in body Nov2 awarded Critic Nov2 awarded Autobiographer Nov2 revised Positive integers $k = p_{1}^{r_{1}} \cdots p_{n}^{r_{n}} > 1$ satisfying $\sum_{i = 1}^{n} p_{i}^{-r_{i}} < 1$ added 12 characters in body