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41
Examples of patterns that eventually fail
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38
Proof of a formula involving Euler's totient function: $\varphi (mn) = \varphi (m) \varphi (n) \cdot \frac{d}{\varphi (d)}$
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23
Every Transitive Permutation Group Has a Fixed Point Free Element
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20
Why is it called commutative property?
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13
Is $\sqrt{2}\in\mathbb{Q}(\sqrt[8]{3})$ or not?
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11
Computing the number of nonisomorphic finite abelian groups of order $n$
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10
How to represent $\max(x, y)$ in terms of absolute?
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10
Proving that a polynomial is positive
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10
How do I solve $\int\frac{\cos^2(x)}{\sin(x)}\ dx$ without using Weierstass Substitution?
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9
limit $\lim\limits_{n\to\infty}\left(\sum\limits_{i=1}^{n}\frac{1}{\sqrt{i}} - 2\sqrt{n}\right)$
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9
Polynomial of degree $7$ with cyclic Galois group
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8
How to prove $\phi(mn) > \phi(m)\phi(n)$ if $(m,n) \ne 1$
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8
Finding the limit when denominator = 0
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7
no simple group of order $945$
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7
If $G'/G''$ and $G''/G'''$ are cyclic then $G''=G'''$
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6
Galois group of $L/\mathbb{Q}$ is generated by inertia groups
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5
Classify all groups of order $1805.$
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5
Combining terms in a conditionally convergent series
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