User Seth

26 votes

Accepted

Is there a number $n$ such that there are exactly 1 million abelian groups of order $n$?

answered May 8, 2014 at 14:48

23 votes

$f: \mathbb{R} \to \mathbb{R}$ that takes each value in $\mathbb{R}$ twice

answered Mar 28, 2014 at 22:21

21 votes

What's a group whose group of automorphisms is non-abelian?

answered Jul 2, 2015 at 13:51

16 votes

Accepted

With regards to vector spaces, what does it mean to be 'closed under addition?'

answered Mar 16, 2014 at 23:08

15 votes

In any finite graph with at least two vertices, there must be two vertices with the same degree

answered Oct 4, 2014 at 22:46

11 votes

Can a set containing $0$ be purely imaginary?

answered Nov 9, 2014 at 1:18

11 votes

Accepted

There exists a unique isomorphism $M \otimes N \to N \otimes M$

answered Jun 8, 2012 at 12:44

10 votes

Accepted

Continuous function a.e.

answered Jun 10, 2012 at 11:48

10 votes

Accepted

Does every Noetherian ring contain at least one maximal ideal?

answered Jul 11, 2012 at 13:27

10 votes

What kind of matrix is it that when multiplied with its transpose produces the identity?

answered Apr 25, 2014 at 0:53

9 votes

Gradient steepest direction and normal to surface?

answered Jul 9, 2015 at 12:28

8 votes

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Is there an injective continuous map $\mathbb{R}^2 \rightarrow \mathbb{R}$?

answered Apr 18, 2014 at 14:44

8 votes

Accepted

Modules over commutative rings

answered Apr 28, 2014 at 22:19

7 votes

Accepted

Using Rouche's theorem to find number of roots.

answered Apr 28, 2014 at 20:42

7 votes

Accepted

Prove that $|f(z)|\leq |z|^2$ where $f$ is analytic on the unit disc and has a zero of order 2 at zero.

answered May 3, 2014 at 16:47

7 votes

Accepted

Locally lipschitz on $[a,b]$ implies lipschitz

answered Jun 5, 2012 at 21:05

7 votes

$A^2−A=0$, where A is a $9×9$ matrix. Then which is true?

answered Nov 16, 2012 at 12:36

7 votes

Accepted

Symbol $\Gamma$ when talking about vector fields.

answered Jul 4, 2015 at 17:43

7 votes

Research in algebra.

answered Nov 8, 2014 at 13:46

6 votes

A bijection from a disconnected space to a connected space?

answered Jan 27, 2015 at 1:46

6 votes

A contractible space is path connected.

answered Mar 17, 2014 at 17:30

6 votes

proving:Lamda is an eigenvalue of T if and only if $T-\lambda \mathrm{I}$ is not injective.

answered Mar 25, 2014 at 23:44

6 votes

Accepted

Showing that a function is not meromorphic on $\mathbb{C}$

answered Sep 6, 2014 at 13:11

5 votes

Show that $\mathbb{A}^n$ on the Zariski Topology is not Hausdorff, but it is $T_1$

answered Jan 21, 2015 at 2:30

5 votes

Accepted

Uniform convergence on each compact subset implies uniform convergence in the whole open set for analytic functions

answered Oct 7, 2014 at 23:25

5 votes

question about continuity or discontinuity of a function

answered Oct 10, 2014 at 22:35

5 votes

binary operation and closure property

answered Mar 27, 2014 at 13:10

5 votes

Are continuous functions monotonic for very small ranges?

answered Mar 20, 2014 at 11:12

5 votes

Accepted

Closed subsets of Lindelöf spaces are Lindelöf

answered Nov 26, 2012 at 1:57

5 votes

how to visualize binomial theorem geometrically?

answered Jun 11, 2012 at 13:12

Stack Exchange Network

188 Answers

Is there a number $n$ such that there are exactly 1 million abelian groups of order $n$?

$f: \mathbb{R} \to \mathbb{R}$ that takes each value in $\mathbb{R}$ twice

What's a group whose group of automorphisms is non-abelian?

With regards to vector spaces, what does it mean to be 'closed under addition?'

In any finite graph with at least two vertices, there must be two vertices with the same degree

Can a set containing $0$ be purely imaginary?

There exists a unique isomorphism $M \otimes N \to N \otimes M$

Continuous function a.e.

Does every Noetherian ring contain at least one maximal ideal?

What kind of matrix is it that when multiplied with its transpose produces the identity?

Gradient steepest direction and normal to surface?

Is there an injective continuous map $\mathbb{R}^2 \rightarrow \mathbb{R}$?

Modules over commutative rings

Using Rouche's theorem to find number of roots.

Prove that $|f(z)|\leq |z|^2$ where $f$ is analytic on the unit disc and has a zero of order 2 at zero.

Locally lipschitz on $[a,b]$ implies lipschitz

$A^2−A=0$, where A is a $9×9$ matrix. Then which is true?

Symbol $\Gamma$ when talking about vector fields.

Research in algebra.

A bijection from a disconnected space to a connected space?

A contractible space is path connected.

proving:Lamda is an eigenvalue of T if and only if $T-\lambda \mathrm{I}$ is not injective.

Showing that a function is not meromorphic on $\mathbb{C}$

Show that $\mathbb{A}^n$ on the Zariski Topology is not Hausdorff, but it is $T_1$

Uniform convergence on each compact subset implies uniform convergence in the whole open set for analytic functions

question about continuity or discontinuity of a function

binary operation and closure property

Are continuous functions monotonic for very small ranges?

Closed subsets of Lindelöf spaces are Lindelöf

how to visualize binomial theorem geometrically?