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13
Finding groups $G$ such that $G \cong \mathscr{S}(G)$
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13
What is this R-like symbol power 2?
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11
What is the best way to show that no positive powers of this matrix will be the identity matrix?
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10
Adjoining to a ring
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7
$x\le\lceil\sqrt{x}\rceil\left\lceil\frac{x}{\lceil\sqrt{x}\rceil}\right\rceil$?
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7
Math behind rotation in MS Paint
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5
Can a real symmetric matrix have complex eigenvectors?
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5
Product of slopes is -1 iff perpendicular proof from first principles
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