Top network posts

• 125 Why is the Penrose triangle "impossible"?
• 73 Find $xy+yz+zx$ given systems of three homogenous quadratic equations for $x, y, z$
• 33 Why does $1+2+3+\cdots = -\frac{1}{12}$?
• 31 How few disks are needed to cover a square efficiently?
• 26 Is this a known question about the expression of a function on $\Bbb R^2$ as an infinite sum of products?
• 23 What are some surprising appearances of $e$?
• 23 When do two functions become equal?
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