User el_tenedor

14 votes

2 answers

2k views

Simple proof that Fourier transform is an isomorphism between $L^p$ spaces for $p \neq 2$?

asked Aug 28, 2017 at 9:30

10 votes

2 answers

911 views

Why do we want or need cross-norms on tensor products?

asked Apr 14, 2017 at 17:16

9 votes

2 answers

478 views

Does the union of two not disjoint open balls always contain the line connecting the two centers?

asked Aug 20, 2016 at 11:03

9 votes

1 answer

581 views

Why is adjoining a unit the algebraic counterpart to the one point compactification?

asked Jan 5, 2017 at 11:05

9 votes

2 answers

4k views

Is this a measure on the sigma algebra of countable and cocountable subsets of R?

asked Aug 16, 2015 at 10:18

7 votes

0 answers

520 views

If locally convex topologies exhibit the same dual spaces, do they exhibit the same continuous linear operators?

asked Feb 6, 2017 at 10:09

5 votes

1 answer

980 views

Equivalence of definitions for $L_\infty$ norm via essential range and essential supremum

asked Jan 1, 2017 at 11:51

5 votes

2 answers

737 views

Measures on $\mathbb{R}$ that are not translation invariant

asked Jul 31, 2015 at 15:07

4 votes

1 answer

1k views

Incomplete measure space that is not sigma-finite

asked Aug 3, 2015 at 22:03

4 votes

3 answers

2k views

Cauchys integral formula on function with pole of order 2

asked Aug 17, 2015 at 7:54

4 votes

1 answer

97 views

Integration over finite partition of integration domain

asked Jan 27, 2016 at 21:52

4 votes

1 answer

1k views

Series of integrable functions converges pointwise almost everywhere

asked May 28, 2016 at 10:42

4 votes

1 answer

2k views

If $\exp(t(A + B)) = \exp(tA) \exp(tB)$ for all $t \geq 0$ then $A,B$ commute

asked Oct 30, 2016 at 12:56

4 votes

1 answer

360 views

*-homomorphism between concrete von Neumann algebras is SOT-SOT continuous iff it is WOT-WOT continuous

asked Feb 4, 2017 at 17:15

4 votes

1 answer

1k views

Considering operators on the direct sum of Hilbert spaces as operator valued matrices

asked Apr 2, 2017 at 15:29

4 votes

1 answer

224 views

Kaplansky's Parallelogram Law - Why is it called like that?

asked Apr 10, 2017 at 6:18

3 votes

2 answers

213 views

Every Hausdorff-compactification of the reals corresponds to a C*-subalgebra of bounded continuous functions on $\mathbb{R}$

asked Mar 9, 2017 at 17:45

3 votes

1 answer

1k views

Post and Widder Inversion Formula for Laplace Transform

asked Dec 18, 2016 at 18:26

3 votes

0 answers

141 views

Is a boundary which consists of boundaries of balls Lipschitz?

asked Oct 9, 2016 at 14:09

3 votes

1 answer

764 views

Lebesgue differentiation theorem and surface measure

asked Sep 15, 2016 at 6:12

3 votes

2 answers

227 views

If $A \subseteq B$, does $\mbox{dist}(x,\partial A) \le \mbox{dist}(x, \partial B)$ hold for all $x \in A$

asked Jul 2, 2016 at 14:22

3 votes

1 answer

351 views

A topological space is compact iff each infinite subset has a complete accumulation point

asked Jan 17, 2016 at 13:58

3 votes

3 answers

1k views

The Hadamard determinant problem: understanding a proof for the upper bound on matrix determinants

asked Dec 31, 2015 at 21:34

3 votes

1 answer

183 views

Characterize R0-space by convergent filters

asked May 29, 2015 at 16:12

2 votes

1 answer

488 views

Why is $\mathfrak{L}^1$ not a vector space of functions that take infinity as a value

asked Aug 9, 2015 at 19:06

2 votes

1 answer

138 views

Calculate logarithmic index of holomorphic function on open set

asked Aug 17, 2015 at 16:21

2 votes

2 answers

233 views

Is the Cantor cube a closed subset of the Hilbert cube?

asked Jan 15, 2016 at 20:58

2 votes

1 answer

118 views

Why does this sequence of measures of preimages converge to an integral?

asked Sep 17, 2016 at 16:15

2 votes

1 answer

325 views

Is every -representation of a unital commutative C-algebra non-degenerate?

asked Apr 15, 2017 at 13:03

2 votes

1 answer

935 views

Segment condition: Approximation of sobolev functions by functions which are smooth up to the boundary

asked Jul 24, 2017 at 13:47

Stack Exchange Network

64 Questions

Simple proof that Fourier transform is an isomorphism between $L^p$ spaces for $p \neq 2$?

Why do we want or need cross-norms on tensor products?

Does the union of two not disjoint open balls always contain the line connecting the two centers?

Why is adjoining a unit the algebraic counterpart to the one point compactification?

Is this a measure on the sigma algebra of countable and cocountable subsets of R?

If locally convex topologies exhibit the same dual spaces, do they exhibit the same continuous linear operators?

Equivalence of definitions for $L_\infty$ norm via essential range and essential supremum

Measures on $\mathbb{R}$ that are not translation invariant

Incomplete measure space that is not sigma-finite

Cauchys integral formula on function with pole of order 2

Integration over finite partition of integration domain

Series of integrable functions converges pointwise almost everywhere

If $\exp(t(A + B)) = \exp(tA) \exp(tB)$ for all $t \geq 0$ then $A,B$ commute

*-homomorphism between concrete von Neumann algebras is SOT-SOT continuous iff it is WOT-WOT continuous

Considering operators on the direct sum of Hilbert spaces as operator valued matrices

Kaplansky's Parallelogram Law - Why is it called like that?

Every Hausdorff-compactification of the reals corresponds to a C*-subalgebra of bounded continuous functions on $\mathbb{R}$

Post and Widder Inversion Formula for Laplace Transform

Is a boundary which consists of boundaries of balls Lipschitz?

Lebesgue differentiation theorem and surface measure

If $A \subseteq B$, does $\mbox{dist}(x,\partial A) \le \mbox{dist}(x, \partial B)$ hold for all $x \in A$

A topological space is compact iff each infinite subset has a complete accumulation point

The Hadamard determinant problem: understanding a proof for the upper bound on matrix determinants

Characterize R0-space by convergent filters

Why is $\mathfrak{L}^1$ not a vector space of functions that take infinity as a value

Calculate logarithmic index of holomorphic function on open set

Is the Cantor cube a closed subset of the Hilbert cube?

Why does this sequence of measures of preimages converge to an integral?

Is every -representation of a unital commutative C-algebra non-degenerate?

Segment condition: Approximation of sobolev functions by functions which are smooth up to the boundary