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11
What's the difference between $3^{3^{3^3}}$ and $27^{27}\;$?
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10
Countable set having uncountably many infinite subsets
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10
Theorems with an extraordinary exception or a small number of sporadic exceptions
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9
Proving an invertible matrix which is its own inverse has determinant $1$ or $-1$?
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8
Example computation of $\operatorname{Tor_i}{(M,N)}$
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8
Commutator subgroup of a subgroup
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8
Group of order 1225 is abelian
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7
subgroup of direct product of two groups
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7
How many elements of order $7$ are there in a group of order $28$ without Sylow's theorem
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6
Minimal polynomial of $\sqrt2+1$ in $\mathbb{Q}[\sqrt{2}+\sqrt{3}]$
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6
what $D_8/D_8$ is isomorphic to
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6
Is $SL_n(\mathbb{R})$ a normal subgroup in $GL_n(\mathbb{R})$?
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5
Winning strategy
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5
Show the inequality $\sigma(n)\phi(n) \geq n^2(1-\frac{1}{p_1^2})(1-\frac{1}{p_2^2})\cdots(1-\frac{1}{p_r^2})$
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5
Does $gHg^{-1}\subseteq H$ imply $gHg^{-1}= H$?
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