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checkmath
  • Member for 11 years, 10 months
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32 votes
4 answers
9k views

Limit of $L^p$ norm when $p\to0$

27 votes
1 answer
8k views

How to prove that an operator is compact?

15 votes
2 answers
5k views

Isometric Embedding of a separable Banach Space into $\ell^{\infty}$

13 votes
2 answers
5k views

An uncountable family of measurable sets with positive measure

13 votes
2 answers
4k views

About connected Lie Groups

12 votes
2 answers
5k views

The graph of a measurable function

12 votes
1 answer
2k views

An application of J.-L. Lion's Lemma

11 votes
2 answers
3k views

Approximation of the identity and Hardy-Littlewood maximal function

11 votes
1 answer
560 views

About a measurable function in $\mathbb{R}$

7 votes
4 answers
584 views

About the $p$ summable sequences

6 votes
1 answer
931 views

Functions of bounded variation on all $\mathbb{R}$

6 votes
2 answers
349 views

A sequence of singular measures converging weakly* to a continuous measure

6 votes
0 answers
229 views

About the Platonic Solids in all dimensions

6 votes
2 answers
1k views

The closure of $C^1$ in the functions of bounded variation

6 votes
1 answer
174 views

A Marcinkiewicz approach

5 votes
1 answer
280 views

A measurable function

5 votes
5 answers
2k views

History of the construction of $\mathbb{R}$

4 votes
1 answer
157 views

A non weakly convergent sequence in $L^p(\mathbb{N})$

4 votes
1 answer
123 views

A dense scission of $\mathbb{R}$

4 votes
1 answer
386 views

A Hilbert basis for $L^2 ([0,1]\times[0,1])$

4 votes
0 answers
189 views

The Lebesgue differentiation Theorem holds for any measure?

4 votes
1 answer
455 views

Weak derivatives

4 votes
2 answers
938 views

The cone is not immersed in $\mathbb{R}^3$

4 votes
1 answer
423 views

How to show that "spheres" are diffeomorphic?

4 votes
0 answers
157 views

Series of Maximal Operator

3 votes
1 answer
159 views

Cauchy sequences when $p$ is a function

3 votes
1 answer
208 views

the integral of a periodic function

3 votes
1 answer
299 views

Levi-Civita connection

3 votes
0 answers
413 views

Radon-Nikodym Decomposition

3 votes
1 answer
345 views

Reference for Radon measure