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40 Why is a circle in a plane surrounded by 6 other circles? Nov 17 '10
37 Quotient geometries known in popular culture, such as “flat torus = Asteroids video game” Nov 17 '10
33 If all sets were finite, how could the real numbers be defined? Aug 9 '10
32 Is there a quick proof as to why the vector space of $\mathbb{R}$ over $\mathbb{Q}$ is infinite-dimensional? Oct 11 '10
31 Prove that this function is bounded Aug 3 '10
29 StarCraft II: Ladder math Oct 27 '10
28 What is the importance of the Collatz conjecture? Nov 16 '10
27 Proving a known zero of the Riemann Zeta has real part exactly 1/2 Oct 25 '10
23 Proof that Pi is constant (the same for all circles), without using limits Aug 24 '10
19 Boy Born on a Tuesday - is it just a language trick? Sep 11 '10
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