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Olba12
  • Member for 9 years, 2 months
  • Last seen more than 2 years ago
  • Sweden
11 votes
1 answer
1k views

Prove that $T(x^* + W^{\perp}) = y^*$ is an isometric isomorphism from $V^*/W^\perp$ to $W^*$

7 votes
7 answers
697 views

Homework problem for a first grader on $9$gag [closed]

6 votes
2 answers
175 views

Algebra (Matrix Theory) Linear Maps

6 votes
2 answers
17k views

Prove that a set is closed iff it contains all its accumulation points

5 votes
1 answer
9k views

Fourier transform of $\sin(x)$

5 votes
2 answers
172 views

Compute the norm of an operator $T$

5 votes
1 answer
3k views

Banach limit, Hahn-Banach theorem

4 votes
1 answer
61 views

what does $+$ mean in $f(x) = (1 - |x|)_{+}$?

4 votes
1 answer
254 views

Hahn-Banach and seminorms

4 votes
1 answer
93 views

$E[X\mid F_n] \to X$ almost surely

4 votes
1 answer
151 views

Can every number in $\mathbb{N}$ be written in base $-10$?

4 votes
3 answers
324 views

Prove that $14322\mid n^{31} - n$

3 votes
1 answer
4k views

Prove that multiplication is well defined

3 votes
1 answer
54 views

Strange sum in matrix theory

3 votes
1 answer
116 views

Show that c belongs to the commutator subgroup

3 votes
1 answer
74 views

Why is this a topology?

3 votes
1 answer
126 views

$U$ open neighbourhood of the origin. Then there is an open neighbourhood $N$ of the origin st $\alpha N \subset U$

3 votes
1 answer
173 views

If $(X_n, d_n)$ is a family of complete metric spaces, prove that $(X,d)$ is complete

3 votes
1 answer
14k views

How do you find mixed strategy Nash Equilibrium in a 3 player game?

3 votes
2 answers
6k views

Show that $int(A)$ is the union of all open subsets of $A$.

2 votes
1 answer
1k views

How can Banach fixed point theorem be used to prove that there is a unique solution to differential equation?

2 votes
2 answers
211 views

U open neighbourhood of the origin $\Rightarrow$ $\exists N$ open neighbourhood of the origin s.t $\alpha N \subset U \ \forall |\alpha | \leq 1$

2 votes
0 answers
36 views

if $\phi_{X}^{(n)}(0) = \phi_{Y}^{(n)}(0) \ \forall n\in \{0\}\cup \mathbb{N}$. Are $X,Y$ identically distributed?

2 votes
1 answer
69 views

Given $f= x^2$ what does $T_f$ look like?

2 votes
1 answer
790 views

Quotient topology $f:X \to Y$ continuous iff $g: X/{\sim} \to Y$ continuous.

2 votes
1 answer
542 views

Prove that $R: W^{\perp} \to (V/W)^*, \ Rx^* = \tilde{x}^*$ is a well-defined.

2 votes
1 answer
203 views

$c_0$ is not weakly sequentially complete

2 votes
1 answer
61 views

Does there exist a $b$ such that the integral exists?

2 votes
1 answer
158 views

How to verify that $e^{x(z_1+1+z_2)}\frac{\Gamma (z_2) \Gamma (z_1)}{\Gamma (z_1+z_2 + 2)} \in L^1(\mathbb{R^2})$?

2 votes
1 answer
285 views

Convexity of an awful function involving a quotient of gamma functions and expected value

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