Top network posts

• 110 How to distinguish between walking on a sphere and walking on a torus?
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• 45 Is $\mathbf{Q}(\sqrt{2}, \sqrt{3}) = \mathbf{Q}(\sqrt{2}+\sqrt{3})$?
• 38 Prove that $\gcd(M, N)\times \mbox{lcm}(M, N) = M \times N$.
• 37 How to explain that division by $0$ yields infinity to a 2nd grader
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• 28 Compute the pushforward of the vector field $\frac{\partial}{\partial x^1}$ via a given function $\phi$
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