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• 27 A manifold for Hilbert's hotel
• 17 Is $\mathbb Z _p^*=\{ 1, 2, 3, ... , p-1 \}$ a cyclic group?
• 17 I need some help with the integral $\int_0^\infty \frac{x^3}{e^x+1} \, dx$
• 17 Minimum of two metrics is metric
• 14 Tiling a cylindrical piece of paper
• 12 The Sphere Does Not Admit a Metric Isometry into a Euclidean Space.
• 11 $ a+b+c=0,\ a^2+b^2+c^2=1$ implies $ a^4+b^4+c^4=\frac{1}{2}$
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