Al jabra's user avatar
Al jabra's user avatar
Al jabra's user avatar
Al jabra
  • Member for 8 years, 11 months
  • Last seen more than 1 year ago
23 votes
2 answers
61k views

What does sgn mean?

19 votes
7 answers
11k views

Proving a theorem, what is meant by sufficiency and necessity?

9 votes
2 answers
7k views

What is the meaning of $\mathbb{N_0}$?

8 votes
2 answers
2k views

Is saying a set is nowhere dense the same as saying a set has no interior?

6 votes
3 answers
2k views

General structure of the proof that every compact metric space is the continuous image of the Cantor set

6 votes
2 answers
12k views

Understanding the proof: a linear functional is continuous if and only if it is bounded.

5 votes
1 answer
967 views

Obtaining the Rodrigues formula

4 votes
2 answers
735 views

Intuition behind subspace $\sigma$-Algebra

4 votes
2 answers
4k views

Using Lebesgue's dominated convergence theorem to show a function is continuous.

4 votes
3 answers
294 views

Intuition behind the definition of a surface

4 votes
1 answer
6k views

Easy way to find the order of elements in a finite field

4 votes
3 answers
574 views

Express $w=f(z)=\frac{1}{(1-z)^2}$ in the form $w=u(x,y)+iv(x,y)$

3 votes
1 answer
229 views

Abelianised dihedral group isomorphism

3 votes
1 answer
340 views

Laplace transforms to solve heat equation

3 votes
2 answers
3k views

Proving the set of Orbits is a partition on a set

3 votes
2 answers
1k views

Intuition about construction of measures and outer measures

3 votes
0 answers
219 views

Caratheodory's method

3 votes
4 answers
2k views

Why is $X^2+1$ reducible in $F_2$?

3 votes
2 answers
248 views

Show $F_b (\Omega, X)$ is a Banach space

3 votes
1 answer
269 views

Show the operator $T$ is bounded if and only if $\sup|\lambda_j| < \infty$

3 votes
3 answers
5k views

Meaning of the word dom.

3 votes
1 answer
99 views

$\lim_ {n \to \infty} f_n$ is $\Sigma$-measurable

2 votes
1 answer
82 views

Show that for every $\varepsilon>0$ there exists an open dense set $G \subset \mathbb{R}$ whose Lebesgue measure is at most $\varepsilon$

2 votes
2 answers
86 views

Show for $x,y \in \mathbb{X} : |d_A (x) - d_A (y)| \leq d(x,y)$

2 votes
1 answer
3k views

Properties of the Fejer kernel

2 votes
0 answers
507 views

Finding the multiplicative inverses in fields

2 votes
1 answer
564 views

A property of the Volterra operator

2 votes
1 answer
333 views

Arc length in Euclidean Space

2 votes
1 answer
141 views

Where does $\ddot\gamma=k_n N+k_g N \times\dot \gamma$ come from?

2 votes
1 answer
696 views

How to check if an operator is invertible?

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