user71815
  • Member for 8 years, 9 months
  • Last seen more than 3 years ago
5 answers
11 votes
1k views
4 bookmarks
Does $a^3 + 2b^3 + 4c^3 = 6abc$ have solutions in $\mathbb{Q}$
1 answers
5 votes
177 views
Union of proper subspaces, which is correct?
1 answers
5 votes
240 views
2 bookmarks
Homework: No field extension is "degree 4 away from an algebraic closure"
1 answers
5 votes
1k views
2 bookmarks
Representation problem from Serre's book
1 answers
4 votes
1k views
1 bookmarks
Prime ideals in non-commutative ring
1 answers
4 votes
116 views
1 bookmarks
Cardinality of basis of endormophism algebra
1 answers
4 votes
396 views
6 bookmarks
Intermediate fields between $\mathbb{Z}_2 (\sqrt{x},\sqrt{y})$ and $\mathbb{Z}_2 (x,y)$
1 answers
3 votes
230 views
2 bookmarks
Problem 1.25 of Etingof: Indecomposable rep which is not cyclic
0 answers
3 votes
681 views
Normal closure of field extension, axiom of choice
2 answers
3 votes
122 views
$p$ ramifies in a number field, then it does so in an overfield
2 answers
3 votes
77 views
Soft question: $(a_n) \in A$ or $(a_n) \subseteq A$ f0r sequences?
2 answers
3 votes
293 views
Algebraic closure exists: What's wrong with this proof?
1 answers
3 votes
514 views
Rouche's theorem problem
1 answers
2 votes
55 views
What is a quick proof that $f \in \mathbb{C}[X_1,\dotsc,X_n]$ is determined by its induced function on $\mathbb{C}^n$?
0 answers
2 votes
193 views
1 bookmarks
Convex subsets, Normed spaces, Separating hyperplane
0 answers
2 votes
624 views
1 bookmarks
Dedekind's criterion clarification
1 answers
2 votes
404 views
Series of independent random variables are independent
1 answers
2 votes
409 views
Representation problem: I don't understand the setting of the question! (From Serre's book)
1 answers
2 votes
2k views
1 bookmarks
Irreducible characters form orthonormal basis of set of class functions
2 answers
2 votes
354 views
Winding number in complex plane homework
1 answers
2 votes
235 views
What happens outside radius of convergence
2 answers
1 votes
126 views
Definitions of valuations in terms of totally ordered group
1 answers
1 votes
26 views
Can the induced function of non-zero $f \in R[X]$ be zero, when $R$ is an infinite non-integral domain?
1 answers
1 votes
109 views
1 bookmarks
Laplace's equation, integral, tends to steady state?
1 answers
1 votes
96 views
$(2,1+\sqrt{-5})$ has integral basis $2$, $1+\sqrt{-5}$
2 answers
1 votes
89 views
Generators of finite group keep their orders in a quotient
2 answers
1 votes
214 views
When does $\sum_{i=3}^\infty n^{-1} (\log \log n)^{-r}$ converge
1 answers
1 votes
284 views
What's this matrix called?
2 answers
0 votes
134 views
Page 132 from Algebra vol1 (2ed) by P.M. Cohn
1 answers
0 votes
26 views
Infinite sets: $|a| < |b|$ implies $|c^a| < |c^b|$