User the man

26 votes

5 answers

55k views

1 and 2 norm inequality

asked May 23, 2017 at 18:40

11 votes

7 answers

2k views

Only finitely many $n$ such that $\phi(n) = m$

asked May 21, 2018 at 9:41

5 votes

3 answers

2k views

Characteristic and primitive roots of unity

asked Jan 18, 2019 at 8:49

5 votes

1 answer

2k views

What does it mean for a group action to be linear?

asked Mar 24, 2019 at 13:51

5 votes

2 answers

996 views

How orbits of $G$-sets and these characters are related

asked Jan 8, 2019 at 19:16

4 votes

2 answers

453 views

Proving one compactness theorem from the other

asked May 17, 2018 at 21:22

4 votes

1 answer

595 views

Dimension of the invariant subspace

asked Mar 29, 2019 at 21:20

4 votes

1 answer

167 views

$3$ is a quadratic residue $\bmod p$ iff $ p \equiv \pm 1 \bmod12$

asked May 21, 2018 at 20:38

4 votes

2 answers

384 views

Divisors of the Euler totient function

asked May 22, 2018 at 15:36

4 votes

2 answers

4k views

Projection of a plane on $xy$ plane

asked Oct 19, 2016 at 18:15

3 votes

3 answers

707 views

Logical equivalences cancellation

asked Feb 20, 2018 at 0:25

3 votes

3 answers

112 views

Modular arithmetic - remainders

asked Nov 29, 2015 at 14:09

3 votes

1 answer

54 views

Finding an $N$, such that $\forall n \geq N$...

asked May 18, 2016 at 16:49

3 votes

1 answer

17k views

Laplacian derivation cylindrical coordinates

asked Oct 16, 2016 at 18:43

3 votes

1 answer

655 views

When is $\phi(n)$ a prime number?

asked May 21, 2018 at 21:26

3 votes

1 answer

183 views

The set of bilinear forms is a right $(R \otimes R)$-module

asked Apr 24, 2019 at 15:15

3 votes

1 answer

502 views

Tensor products of modules over non-commutative rings

asked Apr 24, 2019 at 13:01

3 votes

2 answers

106 views

Binomial coefficients sum

asked Mar 28, 2019 at 16:24

3 votes

1 answer

71 views

Showing this is an automorphism

asked Feb 10, 2019 at 13:38

3 votes

0 answers

244 views

Factoring $x^n - 1$ and minimal polynomials

asked Feb 10, 2019 at 19:52

2 votes

2 answers

471 views

Generators of the image of a homomorphism

asked Mar 24, 2019 at 13:57

2 votes

0 answers

460 views

Class number of $\mathbb{Q}(\sqrt{13})$

asked May 27, 2019 at 15:45

2 votes

1 answer

268 views

Representation of $V$ and polynomial rings

asked Mar 30, 2019 at 17:09

2 votes

1 answer

53 views

Order of quantifiers in this implication

asked May 28, 2018 at 18:34

2 votes

0 answers

224 views

Extending Isomorphisms

asked Oct 16, 2018 at 22:22

2 votes

1 answer

626 views

No common eigenvectors then representation irreducible

asked Nov 8, 2018 at 19:19

2 votes

2 answers

2k views

Generator matrix of the extended hamming code

asked Nov 9, 2018 at 18:13

2 votes

1 answer

208 views

Constructing the binary Golay code

asked Nov 27, 2018 at 0:56

2 votes

2 answers

657 views

Show that this ring is semi-simple

asked Dec 3, 2018 at 13:58

2 votes

1 answer

944 views

Proving that an alternating sequence does not converge

asked May 11, 2016 at 16:48

Stack Exchange Network

159 Questions

1 and 2 norm inequality

Only finitely many $n$ such that $\phi(n) = m$

Characteristic and primitive roots of unity

What does it mean for a group action to be linear?

How orbits of $G$-sets and these characters are related

Proving one compactness theorem from the other

Dimension of the invariant subspace

$3$ is a quadratic residue $\bmod p$ iff $ p \equiv \pm 1 \bmod12$

Divisors of the Euler totient function

Projection of a plane on $xy$ plane

Logical equivalences cancellation

Modular arithmetic - remainders

Finding an $N$, such that $\forall n \geq N$...

Laplacian derivation cylindrical coordinates

When is $\phi(n)$ a prime number?

The set of bilinear forms is a right $(R \otimes R)$-module

Tensor products of modules over non-commutative rings

Binomial coefficients sum

Showing this is an automorphism

Factoring $x^n - 1$ and minimal polynomials

Generators of the image of a homomorphism

Class number of $\mathbb{Q}(\sqrt{13})$

Representation of $V$ and polynomial rings

Order of quantifiers in this implication

Extending Isomorphisms

No common eigenvectors then representation irreducible

Generator matrix of the extended hamming code

Constructing the binary Golay code

Show that this ring is semi-simple

Proving that an alternating sequence does not converge