Stephen's user avatar
Stephen's user avatar
Stephen's user avatar
Stephen
  • Member for 10 years, 8 months
  • Last seen this week
71 votes
Accepted

How do you respond to "I was always bad at math"?

49 votes
Accepted

Jacobi identity - intuitive explanation

30 votes

Theorems' names that don't credit the right people

26 votes

"Naturally occurring" non-Hausdorff spaces?

25 votes

Theorems with an extraordinary exception or a small number of sporadic exceptions

24 votes
Accepted

How to find $x^{2000}+x^{-2000}$ when $x + x^{-1} = \frac{1}{2}(1 + \sqrt{5})$

21 votes
Accepted

Dimension of $GL(n, \mathbb{R})$

18 votes

How to understand dot product is the angle's cosine?

17 votes
Accepted

Difference between free groups, free product of two groups, tensor product of two infinite cyclic groups

17 votes
Accepted

Show that $k[x,y,z]/(xz-y^2)$ is not a UFD.

12 votes
Accepted

Intuition behind Maschke's theorem

12 votes
Accepted

The mysterious isomorphism between coinduction and induction

10 votes
Accepted

Chern numbers of Projective Space

10 votes
Accepted

Proving results in representation theory from category theory

9 votes

Are fractional ideals usual ideals?

9 votes

The "need" for cohomology theories

9 votes

Polynomials with rational zeros

8 votes

Indecomposable finite-dimensional representations of the nonabelian two-dimensional Lie algebra

8 votes

Ring of polynomials as a module over symmetric polynomials

8 votes

A solution to $y^5 \equiv 2\pmod{251} $

8 votes
Accepted

Irreducible Representations of Matrix Algebras

8 votes
Accepted

Tensor product of 2 coordinate rings

8 votes

Prove: $\frac{n^5}5 + \frac{n^4}2 + \frac{n^3}3 - \frac n {30}$ is an integer for $n \ge 0$

8 votes
Accepted

Homeomorphism between homeomorphic spaces

8 votes

Ring of Invariants of $A_3$

8 votes
Accepted

When is a homomorphism between two group presentations an isomorphism?

7 votes

How to find all naturals $n$ such that $\sqrt{1 {\underbrace{4\cdots4}_{n\text{ times}}}}$ is an integer?

7 votes
Accepted

Is $\mathrm{GL}_n(\mathbb C)$ divisible?

7 votes
Accepted

Abelian Kummer Extension

7 votes
Accepted

is prime spectrum $Spec(R)$ countable?

1
2 3 4 5
9