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• 36 How to prove that $\mathbb{Q}[\sqrt{p_1}, \sqrt{p_2}, \ldots,\sqrt{p_n} ] = \mathbb{Q}[\sqrt{p_1}+ \sqrt{p_2}+\cdots + \sqrt{p_n}]$, for $p_i$ prime?
• 14 Subgroups of $(\mathbb Z_n,+)$
• 12 Conjugacy classes of a $p$-group
• 11 What is the meaning of "this [int index]"?
• 11 $x \otimes y - y \otimes x \neq 0$ in $I \otimes_{R} I$
• 10 Compact space, locally finite subcover
• 10 Residue integral: $\int_{- \infty}^{+ \infty} \frac{e^{ax}}{1+e^x} dx$ with $0 \lt a \lt 1$.
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