User Tomás - Mathematics Stack Exchange

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	3,994 reputation	bio	website		visits	member for	8 months
2524 badges		location	Brazil		seen	3 mins ago

2

12

votes

1

answer

265

views

$\tilde{u}=0,\ a.e.\ x\in\Gamma$?

sobolev-spaces

apr 23 at 16:58 Community♦ 1

3

11

votes

3

answers

168

views

Functions satisfying $\sum_{n=0}^k(-1)^n\binom{k}{k-n}f^{k-n}(x)=0$.

real-analysis functional-equations

mar 19 at 12:50 Marc van Leeuwen 24k

10

votes

4

answers

261

views

Is this limit equal to 1?

limit integration

sep 27 at 15:48 Neal 6,530

2

9

votes

3

answers

77

views

Why convolution regularize functions?

convolution

may 21 at 14:39 robjohn♦ 60k

2

8

votes

3

answers

209

views

$X\subsetneqq Y$ but $X^\star=Y^\star$

functional-analysis

may 14 at 1:39 julien 23.2k

8

votes

3

answers

217

views

Is the set of discontinuity of $f$ countable?

real-analysis

mar 5 at 16:47 copper.hat 28.5k

2

8

votes

3

answers

300

views

Is this a Cantor Set?

real-analysis general-topology

jan 10 at 23:13 Community♦ 1

1

7

votes

4

answers

452

views

How to Decompose $\mathbb{N}$ like this? [duplicate]

elementary-set-theory

oct 25 at 13:49 Marc van Leeuwen 24k

6

votes

1

answer

303

views

What is the Sequence that Maximizes this Distance?

geometry

2d ago Community♦ 1

1

6

votes

4

answers

121

views

Is this Function Continuous at the origin?

real-analysis continuity

feb 23 at 10:14 robjohn♦ 60k

6

votes

2

answers

149

views

How to define Continuous $f: B\rightarrow B$ without fixed points?

banach-spaces

jan 11 at 18:15 David Mitra 41.1k

1

5

votes

1

answer

49

views

$\int_\Omega F(u_n)\to0$ implies $\int_\Omega F(au_n)\to 0$ for $a\in [0,\infty)$?

measure-theory convergence

1d ago Niels Diepeveen 2,213

5

votes

4

answers

108

views

Is this property true?

real-analysis

feb 22 at 17:01 Jonas Meyer 35.1k

1

5

votes

2

answers

93

views

Question about Topological Vector Spaces

topological-vector-spaces

feb 21 at 13:52 Jyrki Lahtonen 30.9k

5

votes

0

answers

93

views

Help me understand this proof (showing that something is a norm).

pde norm sobolev-spaces

feb 18 at 18:27 Tomás 3,994

5

votes

1

answer

138

views

Interior Sphere Condition

geometry analysis

feb 2 at 3:16 Community♦ 1

5

votes

1

answer

157

views

What is the Cardinality of this set?

elementary-set-theory cardinals

dec 30 at 0:44 Asaf Karagila 91.7k

3

5

votes

1

answer

97

views

A Priori Estimates for p-Laplace Equation

pde

dec 18 at 21:33 Community♦ 1

5

votes

1

answer

94

views

Weak Convergence in $L^p$

convergence

nov 12 at 23:28 Julián Aguirre 14.6k

2

5

votes

1

answer

81

views

Compact Immersion $L^{p}\hookrightarrow L^{q}$

banach-spaces compactness

oct 5 at 13:39 Nate Eldredge 22.4k

5

votes

2

answers

270

views

Is there a function like this?

functions morse-theory

oct 4 at 21:30 Lukas Geyer 4,945

4

votes

1

answer

44

views

Constructing a odd homeomorphism between $A$ and $S^n$.

geometry algebraic-topology

may 10 at 5:23 Grumpy Parsnip 9,589

4

votes

2

answers

174

views

Does $g$ behave like $t^k$ near the origin?

real-analysis

apr 30 at 16:26 achille hui 6,452

2

4

votes

1

answer

67

views

$\sum_{n=1}^\infty n\beta_n<\infty$ implies $\sum_{n=1}^\infty n\alpha_n\beta_n<\infty$, for $\alpha_n\to\infty$?

sequences-and-series

mar 30 at 18:38 vonbrand 6,616

4

votes

2

answers

86

views

$\lim_{n \to \infty}\int_0^\infty\left ( \log \left ( {\frac{x+n}{x+\frac{1}{n}}}\right )\right )^2dx$

limit

mar 21 at 18:21 sos440 14.4k

1

4

votes

2

answers

86

views

$\int_0^1 u(t)\phi''(t)dt \geq 0,\ \forall \phi\in C_0^1((0,1)), \ \phi\geq 0$. Is $u$ convex?

real-analysis convex-analysis

mar 11 at 14:21 Zarrax 19.7k

4

votes

3

answers

130

views

How can One Generalize a Result?

soft-question

jan 17 at 15:54 Nick Kidman 2,636

4

votes

0

answers

47

views

Diffeomorphism on the Sphere

analysis

dec 12 at 19:08 Makoto Kato 11.3k

1

4

votes

1

answer

114

views

Geodesic on Spheres

geodesy

oct 27 at 13:10 Neal 6,530

4

votes

2

answers

122

views

Is norm non-decreasing in each variable?

norm

oct 27 at 10:38 Tomás 3,994

Tomás

143 Questions