john mangual
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 Aug 15 revised Moebius band not homeomorphic to Cylinder. added 259 characters in body Aug 15 revised Moebius band not homeomorphic to Cylinder. added 259 characters in body Aug 15 answered Moebius band not homeomorphic to Cylinder. Aug 15 comment Area of a Random Polygon I don't think the exact formula is a very exciting thing to compute. There are some interesting formulas in the large $n$ limit. See the papers of John Pardon. arXiv:1110.5656 Central limit theorems for uniform model random polygons. Aug 15 comment Without using Heegner-Stark-Baker, $\mathbb{Q}(\sqrt{-11})$ has class number $1$. Possibly related Dense Packings from Algebraic Number Fields and Codes Shantian Cheng Aug 13 revised Dual Cone Construction $\{z \; | \;z \perp v \text{ for some } v \in \Lambda \}$ added 13 characters in body Aug 13 asked Dual Cone Construction $\{z \; | \;z \perp v \text{ for some } v \in \Lambda \}$ Aug 13 comment Does $\cos (\pi/5)$ belong to $\mathbb{Q} (\sin(\pi/5))$? Somehow we should exploit: $\cos \frac{\pi}{5} = \sqrt{1 - \sin^2 \frac{\pi}{5}}$ or something. I been looking at these proofwiki.org/wiki/Quintuple_Angle_Formulas Aug 11 revised Number of irreducible quadratic polynomials over a finite field added 264 characters in body Aug 11 comment Number of irreducible quadratic polynomials over a finite field I like your use of "invisible ink" - it's great pedagogical tool. Aug 11 comment Number of irreducible quadratic polynomials over a finite field In $\mathbb{F}_2$, there are only 4 possibilities $x^2 , x^2 + 1=(x+1)^2, \color{blue}{x^2 + x + 1}, x^2 + x = x(x+1)$ Aug 11 answered Number of irreducible quadratic polynomials over a finite field Aug 9 answered Explanation of a method to compute $\sum_{k \le n} k^2$ Jul 31 awarded Nice Question Jul 30 revised Why is $\zeta(1+it) \neq 0$ equivalent to the prime number theorem? added 97 characters in body Jul 30 asked Why is $\zeta(1+it) \neq 0$ equivalent to the prime number theorem? Jul 30 accepted Computing the intersection of two arithmetic sequences $(a\mathbb{Z} + b) \cap (c \mathbb{Z} + d)$ Jul 30 asked Computing the intersection of two arithmetic sequences $(a\mathbb{Z} + b) \cap (c \mathbb{Z} + d)$ Jul 29 accepted Can the numbers $2^m 3^n$ have an infinitely long arithmetic sequence? Jul 29 comment Can the numbers $2^m 3^n$ have an infinitely long arithmetic sequence? See it's not so easy? Dirichlet's theorem was my motivation for this problem. As for the comments above, proving the natural density is 0 might also be hard.