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yoyo

Apparently, this user prefers to keep an air of mystery about them.

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20 Does a topology on a countable set always have a countable base? May 24 '11
20 Different ways to prove there are infinitely many primes? Jul 7 '11
19 Values of $\sum_{n=0}^\infty x^n$ and $\sum_{n=0}^N x^n$ Mar 25 '11
18 explicit “exotic” charts Mar 26 '11
17 Null-homotopic Maps from $S^n$ to $S^1$ for $n \gt 1$. Dec 14 '11
15 Why do they use $\equiv$ here? Mar 28 '11
15 $A_n$ is the only subgroup of $S_n$ of index $2$. Mar 14 '11
15 Cartesian product of two $\sigma$-algebras is generally not a $\sigma$-algebra? Apr 5 '11
13 Fundamental group of a torus with points removed Feb 20 '11
13 Why is $\lim\limits_{x \rightarrow \infty}x-\ln{(1+e^x)} = 0$? Dec 17 '11
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