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Babak Miraftab

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40 Example of a Borel set that is neither $F_\sigma$ nor $G_\delta$ Oct 17 '11
22 Does $\sum\limits_{n=1}^\infty\frac{1}{\sqrt{n}+\sqrt{n+1}}$ converge? Jun 24 '12
18 Why does $PSL(2,\mathbb C)\cong PGL(2,\mathbb C)$ but $PSL(2,\mathbb R) \not\cong PGL(2,\mathbb R)$? Mar 18 '12
17 Proving a trig identity: $\frac{\sin(A + B)}{\sin(A - B)}=\frac{\tan A + \tan B}{\tan A - \tan B}$ Feb 8 '14
17 The limit of $\tan(n)$ Nov 20 '14
15 If in a group $G$, we have $a^5 = e$ and $aba^{-1} = b^2$ for some $a$, $b$ in $G$, then what is the order of $b$? Apr 2 '14
13 A characteristic subgroup is a normal subgroup Jun 3 '12
12 Number of solutions of $x^2_1+\dots+x^2_n=0,$ $x_i\in \Bbb{F}_q.$ Aug 16 '12
11 Group question: only one element $x$ with order $n>1$, then $x\in Z(G)$ Apr 12 '12
7 Group with exactly two subgroups of index 2 Nov 26 '13
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