wxu's user avatar
wxu's user avatar
wxu's user avatar
wxu
  • Member for 11 years, 10 months
  • Last seen more than a month ago
6 votes
1 answer
1k views

Going down theorem fails

4 votes
3 answers
2k views

Determine the centre of a circle

6 votes
1 answer
416 views

The product of two spectral spaces

12 votes
3 answers
2k views

Are the determinantal ideals prime?

6 votes
1 answer
99 views

An inequality question about $x\ln x+x^2$.

4 votes
2 answers
217 views

Infinite many curves passing through finite points?

16 votes
3 answers
1k views

Question about UFD

14 votes
2 answers
3k views

Irreducible polynomial modulo every prime?

2 votes
2 answers
418 views

Faithful extension (Is the image of a polynomial map an algebraic set? )

11 votes
2 answers
3k views

Finitely generated idempotent ideals are principal: proof without using Nakayama's lemma

4 votes
1 answer
2k views

Subfields of the field of complex numbers with finite index rather than the real number field [duplicate]

14 votes
2 answers
2k views

Must $k$-subalgebra of $k[x]$ be finitely generated?

8 votes
1 answer
992 views

Irreducible polynomial over an algebraically closed field

5 votes
1 answer
336 views

Examples of abelian group with some property

17 votes
1 answer
1k views

Irreducible components of topological space

4 votes
1 answer
46 views

For what kind of a subset its sums equal $\mathbb{R}^4$

2 votes
1 answer
80 views

How many prime ideals are fixed by a given permutation?

1 vote
0 answers
310 views

Problem about Dirichlet unit theorem

4 votes
2 answers
125 views

The property of the solutions of Pell-Fermat equation

3 votes
1 answer
311 views

A question about elementary number theory

18 votes
1 answer
634 views

The polynomial whose roots are all real

22 votes
1 answer
1k views

Why is the Hessian of an irreducible polynomial not zero?

0 votes
1 answer
244 views

Irreducible polynomial over an algebraically closed field(2)

1 vote
1 answer
537 views

epimorphism in the category of commutative rings

2 votes
2 answers
50 views

Curve has a point which is either singular or has a tangent line parallel to the y-axis.

3 votes
1 answer
119 views

"Weierstrass preparation" of $\mathbb{C}[[X,Y]]$

5 votes
1 answer
164 views

Is $f$ reduced if and only if the derivations $\gcd(\frac{\partial f}{\partial x},\frac{\partial f}{\partial y})=1$ under some conditions?

8 votes
2 answers
2k views

Why we need to add the notion of "separated" to the notion of variety?

3 votes
0 answers
405 views

Is an irreducible element still irreducible under localization?

7 votes
3 answers
192 views

Every element is radical in a field extension.