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agleaner
  • Member for 11 years, 4 months
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12 votes
3 answers
1k views

Binary quadratic forms over Z and class numbers of quadratic fields.

9 votes
5 answers
1k views

Nice exercises on Hilbert's basis theorem

6 votes
2 answers
202 views

If $A/\mathfrak a$ is flat over $A$ then $V(\mathfrak a)$ is open. Why?

5 votes
1 answer
401 views

Easy to state high-dimensional consequences of Bezout theorem

5 votes
2 answers
971 views

Proving algebraically that $\mathbb RP ^3\cong SO(3,\mathbb R)$

5 votes
1 answer
2k views

Is it true that an ideal is primary iff its radical is prime?

4 votes
0 answers
392 views

Geometric median (or Fermat-Weber problem), including continuous case

4 votes
2 answers
957 views

Noether normalization over $\mathbb{Z}$

4 votes
1 answer
171 views

A gentle reference for flat modules with exercises

3 votes
1 answer
143 views

Is complex Abelian variety isogenic to its dual?

3 votes
1 answer
79 views

Complexifications of degree 3 subschemes in $\mathbb A^2_{\mathbb R}$

3 votes
3 answers
223 views

Nice exercises on resultants

2 votes
1 answer
156 views

The origin of notation Z(f) and U(f) in algebraic geometry

2 votes
2 answers
710 views

The transcendence degree of a separably generated field extension K/L

2 votes
2 answers
129 views

Do characters distinguish real representations of a finite group?

2 votes
2 answers
80 views

Good reference for representations of the symmetic group $S_n$

2 votes
1 answer
579 views

Proving that a continuous bijective map is a homeomorphism

1 vote
0 answers
48 views

A picture of the character of an induced representation

1 vote
1 answer
242 views

Algebraic closure of a subfield of the field of fraction of a variety

1 vote
1 answer
394 views

Explaining projective space to master students

1 vote
0 answers
139 views

Classification of commutative Frobenius algebras

1 vote
1 answer
60 views

Non-flatness of the map $\mathbb C[s,t]\to \mathbb C[x, y]$ sending $s$ to $x$ and $t$ to $xy$.

1 vote
0 answers
284 views

Enumerating integer solutions to quadratic equations [duplicate]

0 votes
1 answer
92 views

A typo in Proposition 2.2, Eisenbud commutative algebra?

0 votes
0 answers
41 views

$\mathbb Z^n\otimes_{\mathbb Z}\mathbb C^*=(\mathbb C^*)^n$?