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 Nov 9 awarded Popular Question Sep 28 awarded Popular Question Aug 10 awarded Popular Question Jun 3 comment Parametric curve for a tennis ball seam This is really interesting, thank you! Dec 20 awarded Constituent Dec 15 awarded Caucus Dec 13 awarded Notable Question Oct 29 awarded Yearling Jul 2 awarded Curious Mar 11 accepted Prove that $\bigcup_{n=2}^{\infty} [1/n, 1 - 1/n] = (0, 1)$ Mar 11 asked Prove that $\bigcup_{n=2}^{\infty} [1/n, 1 - 1/n] = (0, 1)$ Dec 8 awarded Critic Nov 28 accepted Solve $z^4 + 4 = 0$ Nov 28 comment Solve $z^4 + 4 = 0$ That $e^{-i \pi} = 1$ is exactly what I was missing. I went and tried to blindly solve it without taking that into account. Thank you and Stahl for pointing it out. Nov 28 asked Solve $z^4 + 4 = 0$ Oct 20 revised Proving $mn = 0$ implies $m = 0$ or $n=0$ for all $m, n \in \mathbb{N}$ using Peano Axioms added 25 characters in body Oct 20 accepted Proving $mn = 0$ implies $m = 0$ or $n=0$ for all $m, n \in \mathbb{N}$ using Peano Axioms Oct 20 comment Proving $mn = 0$ implies $m = 0$ or $n=0$ for all $m, n \in \mathbb{N}$ using Peano Axioms $m = k^+$ and $n = l^+$ for some $k, l \in \mathbb N$ by the third axiom. That's a nice and straightforward proof. Thank you. Oct 20 asked Proving $mn = 0$ implies $m = 0$ or $n=0$ for all $m, n \in \mathbb{N}$ using Peano Axioms Jul 11 revised Why is the Fibonacci ratio though a decreasing function, it is alternating and decreasing? Improved formatting