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Nażysław Zbyłutowicz's user avatar
Nażysław Zbyłutowicz's user avatar
Nażysław Zbyłutowicz's user avatar
Nażysław Zbyłutowicz
  • Member for 7 years, 2 months
  • Last seen more than 6 years ago
  • XI centry Poland
6 votes
2 answers
849 views

are there any matrices that act like the identity matrix but are totally different?

5 votes
1 answer
5k views

How to derive the character table for $D_4$?

4 votes
4 answers
1k views

$\mathbb{R}$ under the metric $|\tan^{-1}x - \tan^{-1}y|$

3 votes
2 answers
1k views

What is the meaning of the $\vdash$ symbol?

3 votes
3 answers
878 views

Show, without invoking the Pythagorean theorem, that the $3-4-5$ triangle is right

3 votes
2 answers
604 views

Piecewise continuous vs. continuous

3 votes
1 answer
121 views

what information is encoded in a Jordan block matrix?

2 votes
1 answer
108 views

is it possible to categorize all subspaces of a given vector space?

2 votes
1 answer
103 views

a Fourier series question

2 votes
2 answers
2k views

what is the dimension of $\wedge^k(V)$?

2 votes
0 answers
108 views

do all vector spaces function under ordinary component wise addition?

2 votes
1 answer
2k views

How do Specht modules give us the irreducible representations of $S_n$?

2 votes
2 answers
377 views

is this sequence Cauchy in the Banach space of continuous functions with infinity norm?

2 votes
1 answer
196 views

if $G$ is a finite group, can we put a bound on the dimension of its irreducible representations?

1 vote
2 answers
45 views

showing that $|x-y|^k$ is a metric on $\mathbb{R}$ for $k \in (0, 1)$

1 vote
0 answers
185 views

Cauchy Integral Formula (what to do when singularities are on the boundary?)

1 vote
2 answers
538 views

Jordan canonical form of a matrix $A$ with the property that $A^2 = 0$?

1 vote
2 answers
1k views

Figuring out nilpotent $2 \times 2$ matrices

1 vote
1 answer
94 views

How was $[T]_{\beta}$ computed here? (change of basis and linear transformations)

1 vote
0 answers
136 views

Column stabilizers of a Young tableaux (Rep. theory)

1 vote
1 answer
66 views

equivalency of the infinity norm and the $p = 1$ norm in $\mathbb{R}^n$

1 vote
1 answer
52 views

showing that a sequence of functions is Cauchy, in a normed space.

1 vote
3 answers
46 views

Trig identity question relating to maximum value on an interval: $\max |\sin nx-\cos nx| = \sqrt2\max |\sin(nx-\frac\pi2)|$

1 vote
1 answer
136 views

is $T = \frac{d}{dx}$ continuous on the space of continuously differentiable functions on an interval?

1 vote
1 answer
61 views

Does such a basis exist? And how can it be proven that it does?

1 vote
0 answers
22 views

Lude composition of the matrix question about theory

1 vote
0 answers
36 views

for this matrix find charactristic and minimal polynomials and eigenvalues

1 vote
1 answer
39 views

Is it always true that if $A = \int_a^b f(x) dx$ then $A - c = \int_a^b (f(x) -c) dx$? [closed]

1 vote
1 answer
1k views

What is the LU decomposition of an upper triangular matrix?

1 vote
0 answers
49 views

how many ways is there to factor matrix?