As of May 31, 2023, we have updated our Code of Conduct.
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PseudoNeo
  • Member for 12 years, 3 months
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61 votes

Commutative non Noetherian rings in which all maximal ideals are finitely generated

40 votes

Geometric motivation for negative self-intersection

34 votes
Accepted

The set of functions which map convergent series to convergent series

33 votes
Accepted

Presentation $\langle x,y,z\mid xyx^{-1}y^{-2},yzy^{-1}z^{-2},zxz^{-1}x^{-2}\rangle$ of group equal to trivial group

21 votes

What is the math behind the game Spot It?

15 votes

Classical presentation of fundamental group of surface with boundary

14 votes
Accepted

Reduced homology

12 votes
Accepted

Open subsets in a manifold as submanifold of the same dimension?

12 votes

Show that $S_4/V$ is isomorphic to $S_3 $, where $V$ is the Klein Four Group.

11 votes
Accepted

Construction of Exotic Spheres

11 votes
Accepted

Possible cup product structures on a manifold

9 votes
Accepted

Original article on the Grothendieck group

9 votes

If F is a field, then $F[x,y]$ is a Principal Ideal Domain?

9 votes
Accepted

Does there exist a double cover with trivial deck transformation group?

9 votes
Accepted

Intuitive reason of why the negation of $P \Rightarrow Q$ is $P \land \neg Q$ instead of $P \Rightarrow \neg Q$

8 votes
Accepted

Twisted Cech cohomology

8 votes
Accepted

What is wrong with this proof on ring of integers being finitely generated

8 votes

Historical basis and mathematical significance of Riemann surfaces

8 votes

Is there such kind of theorem saying two homotopic ways of attaching handle result in diffeomorphic manifolds?

8 votes
Accepted

Structures on torus

7 votes
Accepted

Proof that a periodic function is bounded and uniformly continuous.

7 votes

Are the local rings at smooth points of an irreducible variety isomorphic?

7 votes

Did Zariski really define the Zariski topology on the prime spectrum of a ring?

7 votes
Accepted

Floer theory or Floer homology, an introduction for physicists needed

7 votes
Accepted

Reference request in contact geometry.

7 votes

Non-trivial example of algebraically closed fields

7 votes

Why is $\mathrm{Spec}(\mathbb{Z})$ a terminal object in the category of affine schemes?

7 votes
Accepted

Can $x^2+y^2,y^2+z^2,z^2+x^2$ and $x^2+y^2+z^2$ all be square numbers?

6 votes
Accepted

Can the long line be embedded in euclidean space?

6 votes
Accepted

Finding my mistake in a "proof" that there is no non-trivial knot