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Pavol S.

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67
$A_n$ is the only subgroup of $S_n$ of index $2$.
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38
Is $\{\tan(x) : x\in \mathbb{Q}\}$ a group under addition?
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34
Why determinant of a 2 by 2 matrix is the area of a parallelogram?
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34
Relation between the Dedekind Zeta Function and Quadratic Reciprocity
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31
Fundamental group of complement of $n$ lines through the origin in $\mathbb{R}^3$
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24
What is Haar Measure?
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22
Does the quotient manifold inherit the Riemannian structure?
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20
Infinite Series $‎\sum\limits_{n=2}^{\infty}\frac{\zeta(n)}{k^n}$
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20
Describing Riemann Surfaces
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19
Number of monomials of certain degree
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18
Why do we restrict the definition of Lebesgue Integrability?
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18
Deriving the Surface Area of a Spherical Triangle
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17
Prove that an infinite ring with finite quotient rings is an integral domain
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17
Volume limited to the surface $|x|^{\frac{1}{3}}+|y|^{\frac{1}{3}}+|z|^{\frac{1}{3}}=|a|^{\frac{1}{3}}$
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16
Geometric Interpretation: Parallel forms are harmonic
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16
Compute $\sum_{i,j=1}^{\infty} \frac{(-1)^{i+j}}{i^2+j^2}$
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16
A double series yielding Riemann's $\zeta$
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13
$\int_{0}^{\infty} \frac{\cos x - e^{-x}}{x} \mathrm dx$ Evaluate Integral
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12
Homology and Fundamental group of $\mathbb{R}^4\setminus S^1$
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11
How to compute $I(d\omega)$? (Poincaré's Lemma)
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11
integer partitions
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10
What is $\lim_{n \to \infty} n a_n$?
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10
Existence of a surjective non-linear polynomial $P \in \Bbb Q[X]$
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10
Coefficients of characteristic polynomial of a matrix
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10
Computing the monodromy for a cover of the Riemann sphere (and Puiseux expansions)
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10
roots of $f(z)=z^4+8z^3+3z^2+8z+3=0$ in the right half plane
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10
Uniform convergence problem
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9
Help to compute $\mathrm{Tor}_{n}^{\mathbb{Z}_{4}}(\mathbb{Z}_{2},\mathbb{Z}_{2})$?
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9
Equation of the complex locus: $|z-1|=2|z +1|$
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9
Hecke operators on modular forms
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