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Auclair
  • Member for 7 years, 3 months
  • Last seen more than a month ago
  • Trondheim, Norway
5 votes
1 answer
493 views

Hausdorff spaces and separated maps.

4 votes
1 answer
874 views

Puzzle about sorting coins while blindfolded

4 votes
1 answer
230 views

I'm going to do a project on braid groups, and I'm looking for recommendations on books about braid groups.

3 votes
2 answers
70 views

If $H \triangleleft K \leqslant G$, which requirements must be placed on $K$ in order to obtain $N \triangleleft G$?

3 votes
2 answers
68 views

Is there a "clever" way to solve this congruence?

3 votes
2 answers
576 views

Is this ring R both noetherian and artinian?

3 votes
2 answers
96 views

Explicit automorphisms of the splitting field of a certain quartic over the rationals.

3 votes
1 answer
65 views

Is this enough to justify an internal direct product?

3 votes
0 answers
91 views

Why are the morphisms in an Auslander-Reiten triangle irreducible?

3 votes
1 answer
159 views

Understanding the morphism category (arrow category)

3 votes
1 answer
59 views

Trying to understand some formulas about dualities, specifically $\operatorname{Hom}_{\Lambda}(Y,\nu X) \cong D\operatorname{Hom}_{\Lambda}(X,Y)$.

2 votes
1 answer
155 views

Minimal projective presentations from projective presentations.

2 votes
2 answers
98 views

Two definitions of torsion pairs/theories. How are they equivalent?

2 votes
1 answer
75 views

Are $1$-tilting modules always faithful?

2 votes
0 answers
50 views

What does the weights of $\mathfrak{gl}(V)$ look like as a Lie-module?

2 votes
0 answers
63 views

Is this a bijection between $\mathcal{P}(\mathbb{R})$ and $\mathbb{R}^\mathbb{R}$

2 votes
0 answers
49 views

Help with notation/concepts in module theory and category theory, specifically $\operatorname{Add}(M)$, $\operatorname{Gen}(M)$ and $^\circ(M^\circ)$

2 votes
2 answers
527 views

How do I show this isomorphism between an opposite endomorphism ring and a module over path algebras?

2 votes
1 answer
29 views

Order of $z\in Z(W)\backslash \{\rm{id}\}$ for $W$ the Weyl group.

2 votes
2 answers
271 views

Given the splitting field of a polynomial, how can I show that there are three intermediate extensions which aren't normal?

2 votes
1 answer
215 views

I want to show how many intermediate fields there are between $GF(3^{12})$ and $GF(3^4)$.

2 votes
4 answers
488 views

Prove $2^{1/2}+3^{1/3}$ is irrational using Galois theory.

2 votes
1 answer
424 views

Density in a topological space.

2 votes
1 answer
835 views

What is the Galois group $Gal(E/F)$ when $F=GF(5^3)$ and $E=GF(5^{24})$

2 votes
1 answer
2k views

Is the surface of a torus 2-dimensional?

2 votes
1 answer
69 views

Is this an open covering of $X$ which has no finite subcover?

2 votes
2 answers
1k views

Solving a cubic congruence equation with Chinese Remainder Theorem

2 votes
0 answers
282 views

A continuous bijection between finite topological spaces which is not a homeomorphism

2 votes
2 answers
2k views

Irreducible polynomials over $GF(4)$.

1 vote
1 answer
160 views

Find $\theta \neq \sqrt{3}+\sqrt{5}$ such that $\mathbb{Q}(\theta) = \mathbb{Q}(\sqrt{3},\sqrt{5})$. Need a hint to get started.