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the man
  • Member for 8 years, 4 months
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28 votes
5 answers
58k views

1 and 2 norm inequality

11 votes
7 answers
3k views

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

7 votes
1 answer
2k views

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

5 votes
2 answers
1k views

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

5 votes
3 answers
2k views

Characteristic and primitive roots of unity

4 votes
2 answers
473 views

Proving one compactness theorem from the other

4 votes
1 answer
634 views

Dimension of the invariant subspace

4 votes
1 answer
177 views

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

4 votes
2 answers
407 views

Divisors of the Euler totient function

4 votes
2 answers
4k views

Projection of a plane on $xy$ plane

3 votes
3 answers
754 views

Logical equivalences cancellation

3 votes
3 answers
112 views

Modular arithmetic - remainders

3 votes
1 answer
54 views

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

3 votes
1 answer
18k views

Laplacian derivation cylindrical coordinates

3 votes
1 answer
700 views

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

3 votes
1 answer
187 views

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

3 votes
1 answer
515 views

Tensor products of modules over non-commutative rings

3 votes
2 answers
112 views

Binomial coefficients sum

3 votes
1 answer
72 views

Showing this is an automorphism

3 votes
0 answers
263 views

Factoring $x^n - 1$ and minimal polynomials

2 votes
2 answers
537 views

Generators of the image of a homomorphism $G \rightarrow \operatorname{GL}_{n}(\mathbb{C})$ [closed]

2 votes
0 answers
489 views

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

2 votes
1 answer
278 views

Representation of $V$ and polynomial rings

2 votes
1 answer
54 views

Order of quantifiers in this implication

2 votes
0 answers
237 views

Extending Isomorphisms

2 votes
1 answer
638 views

No common eigenvectors then representation irreducible

2 votes
2 answers
2k views

Generator matrix of the extended hamming code

2 votes
1 answer
238 views

Constructing the binary Golay code

2 votes
2 answers
678 views

Show that this ring is semi-simple

2 votes
1 answer
967 views

Proving that an alternating sequence does not converge

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