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user8268
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76
$A_n$ is the only subgroup of $S_n$ of index $2$.
Mar 14, 2011
40
Is $\{\tan(x) : x\in \mathbb{Q}\}$ a group under addition?
Oct 20, 2013
39
Why determinant of a 2 by 2 matrix is the area of a parallelogram?
Mar 26, 2011
39
Fundamental group of complement of $n$ lines through the origin in $\mathbb{R}^3$
Apr 8, 2012
36
Relation between the Dedekind Zeta Function and Quadratic Reciprocity
Apr 14, 2011
31
Galois group over $p$-adic numbers
Sep 16, 2013
31
Planar geometry problems solved by thinking out of the plane
Oct 19, 2025
27
Does the quotient manifold inherit the Riemannian structure?
May 7, 2011
25
What is Haar Measure?
Sep 15, 2013
25
Deriving the Surface Area of a Spherical Triangle
Feb 16, 2012

Top network posts

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13
Compatibility of the KZ connection with operadic composition
13
Poincaré duality with boundary conditions
11
How to manage pictures in a single file to be easily picked by the main file?
7
Is a quasi-iso in Lie algebra cohomology necessarily an iso?