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95
Easy example why complex numbers are cool
Dec 23, 2014
83
Polynomials irreducible over $\mathbb{Q}$ but reducible over $\mathbb{F}_p$ for every prime $p$
Jun 20, 2012
59
If $H$ is a cyclic subgroup of $G$ and $H$ is normal in $G$, then every subgoup of $H$ is normal in $G$.
Feb 8, 2012
55
How to prove that the sum and product of two algebraic numbers is algebraic? [duplicate]
Jun 7, 2012
34
Proof that determinant rank equals row/column rank
Aug 27, 2012
27
How to find pattern in $1,2,8,9,15,20,26,38....$ infinite sequence?
Sep 28, 2011
26
Description of Levi factors and unipotent radicals of parabolic subgroups in classical groups
Jan 14, 2016
25
$x^a - 1$ divides $x^b - 1$ if and only if $a$ divides $b$
Apr 4, 2012
24
If the tensor power $M^{\otimes n} = 0$, is it possible that $M^{\otimes n-1}$ is nonzero?
Apr 2, 2014
21
Proving that there exists a saturated set with given highest weight
Jun 11, 2014
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53
Which groups can occur as the quotient of a group by its centre?
51
What is Atiyah's topological formulation of the odd order theorem?
45
Results from abstract algebra which look wrong (but are true)
17
How to construct a basis for the dual space of an infinite dimensional vector space?
17
Categorical Unification of Jordan Holder Theorems