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timon92
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12
Is it true that $X\times I\sim Y\times I\implies X\sim Y$? [duplicate]
Jan 30, 2017
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81
What's wrong with this picture? Impossible circles.
19
Solutions to $a,\ b,\ c,\ \frac{a}{b}+\frac{b}{c}+\frac{c}{a},\ \frac{b}{a} + \frac{c}{b} + \frac{a}{c} \in \mathbb{Z}$
16
A circle tangent to an ellipse
15
If two sets $A$ and $B$ have equal power sets, can we conclude that $A=B$?
14
Let $S(n)$ be the sum of the digits of a number $n$. Solve $n+S(n)+S(S(n))=1993$