User PseudoNeo

61 votes

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

answered Aug 16, 2012 at 13:54

40 votes

Geometric motivation for negative self-intersection

answered Jul 13, 2011 at 11:44

34 votes

Accepted

The set of functions which map convergent series to convergent series

answered Sep 29, 2014 at 15:00

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

answered Feb 6, 2015 at 8:27

21 votes

What is the math behind the game Spot It?

answered May 4, 2011 at 8:36

15 votes

Classical presentation of fundamental group of surface with boundary

answered Aug 26, 2014 at 17:58

14 votes

Accepted

Reduced homology

answered Aug 3, 2011 at 19:27

12 votes

Accepted

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

answered Nov 22, 2011 at 15:21

12 votes

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

answered Feb 14, 2013 at 5:19

11 votes

Accepted

Construction of Exotic Spheres

answered Sep 13, 2011 at 8:00

11 votes

Accepted

Possible cup product structures on a manifold

answered Jul 10, 2012 at 17:57

9 votes

Accepted

Original article on the Grothendieck group

answered Aug 15, 2012 at 20:09

9 votes

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

answered Jul 28, 2011 at 8:07

9 votes

Accepted

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

answered Jun 16, 2015 at 14:34

9 votes

Accepted

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

answered Apr 21, 2020 at 19:46

8 votes

Accepted

Twisted Cech cohomology

answered Feb 14, 2013 at 4:48

8 votes

Accepted

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

answered Feb 6, 2015 at 16:04

8 votes

Historical basis and mathematical significance of Riemann surfaces

answered Sep 15, 2011 at 16:00

8 votes

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

answered Aug 3, 2011 at 16:46

8 votes

Accepted

Structures on torus

answered Jul 26, 2012 at 12:29

7 votes

Accepted

Proof that a periodic function is bounded and uniformly continuous.

answered Aug 2, 2012 at 18:41

7 votes

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

answered Nov 22, 2011 at 10:48

7 votes

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

answered Aug 3, 2011 at 18:42

7 votes

Accepted

Floer theory or Floer homology, an introduction for physicists needed

answered Apr 4, 2011 at 22:32

7 votes

Accepted

Reference request in contact geometry.

answered Jun 17, 2016 at 9:56

7 votes

Non-trivial example of algebraically closed fields

answered Jul 13, 2016 at 22:39

7 votes

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

answered Jul 14, 2016 at 17:46

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?

answered Jul 14, 2016 at 13:11

6 votes

Accepted

Can the long line be embedded in euclidean space?

answered Aug 16, 2016 at 12:38

6 votes

Accepted

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

answered Jan 28, 2021 at 20:13

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119 Answers

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

Geometric motivation for negative self-intersection

The set of functions which map convergent series to convergent series

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

What is the math behind the game Spot It?

Classical presentation of fundamental group of surface with boundary

Reduced homology

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

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

Construction of Exotic Spheres

Possible cup product structures on a manifold

Original article on the Grothendieck group

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

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

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

Twisted Cech cohomology

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

Historical basis and mathematical significance of Riemann surfaces

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

Structures on torus

Proof that a periodic function is bounded and uniformly continuous.

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

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

Floer theory or Floer homology, an introduction for physicists needed

Reference request in contact geometry.

Non-trivial example of algebraically closed fields

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

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

Can the long line be embedded in euclidean space?

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