User el_tenedor

2 votes

0 answers

77 views

Uniformly sectorial family: Differentiability of Resolvent

asked Aug 12, 2020 at 12:45

0 votes

2 answers

210 views

Does norm equivalence imply norm equivalence of induced operator norms?

asked Oct 19, 2018 at 13:38

15 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

4 votes

1 answer

637 views

Higher-order reflections: differentiable extensions for $C^k(\overline{\mathbb{R}_+})$ functions

asked Jul 26, 2017 at 14:33

2 votes

1 answer

983 views

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

asked Jul 24, 2017 at 13:47

2 votes

1 answer

342 views

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

asked Apr 15, 2017 at 13:03

10 votes

2 answers

960 views

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

asked Apr 14, 2017 at 17:16

4 votes

1 answer

235 views

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

asked Apr 10, 2017 at 6:18

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

1 vote

0 answers

96 views

Closed graph theorem for operator topologies - Do operator topologies yield Fréchet spaces?

asked Mar 29, 2017 at 9:34

3 votes

2 answers

215 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

1 vote

1 answer

757 views

Characterisation of Murray-von Neumann equivalence of subprojections

asked Feb 24, 2017 at 11:21

7 votes

0 answers

531 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

4 votes

1 answer

368 views

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

asked Feb 4, 2017 at 17:15

9 votes

1 answer

605 views

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

asked Jan 5, 2017 at 11:05

5 votes

1 answer

997 views

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

asked Jan 1, 2017 at 11:51

1 vote

3 answers

65 views

If a topological space is completely regular, can we assume the seperating function to be bounded?

asked Dec 27, 2016 at 9:16

3 votes

1 answer

1k views

Post and Widder Inversion Formula for Laplace Transform

asked Dec 18, 2016 at 18:26

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

3 votes

0 answers

142 views

Is a boundary which consists of boundaries of balls Lipschitz?

asked Oct 9, 2016 at 14:09

0 votes

1 answer

59 views

Do $C^1$ domains share their outer normal field on the common part of their boundary

asked Oct 5, 2016 at 12:43

1 vote

0 answers

451 views

Questions concerning Trace Theorem (Evans - PDE)

asked Sep 28, 2016 at 10:23

1 vote

1 answer

714 views

Equivalence of Sobolev Norms via Fourier Transformation

asked Sep 21, 2016 at 17:22

1 vote

1 answer

2k views

Compact embedding of $H_0^1$ into $C([0,1])$

asked Sep 19, 2016 at 21:47

1 vote

1 answer

119 views

Sequence of series converges to improper integral

asked Sep 18, 2016 at 8:09

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

3 votes

1 answer

806 views

Lebesgue differentiation theorem and surface measure

asked Sep 15, 2016 at 6:12

9 votes

2 answers

480 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

1 vote

0 answers

117 views

Prove that the set $\{f \in L^2(\mathbb{R}^n)^n \mid \text{div} f = 0\}$ of divergence free vector fields is closed in $L^2$

asked Aug 16, 2016 at 7:17

1 vote

0 answers

110 views

Derivation of conservation laws in differential form

asked Aug 7, 2016 at 14:07

Stack Exchange Network

64 Questions

Uniformly sectorial family: Differentiability of Resolvent

Does norm equivalence imply norm equivalence of induced operator norms?

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

Higher-order reflections: differentiable extensions for $C^k(\overline{\mathbb{R}_+})$ functions

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

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

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

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

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

Closed graph theorem for operator topologies - Do operator topologies yield Fréchet spaces?

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

Characterisation of Murray-von Neumann equivalence of subprojections

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

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

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

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

If a topological space is completely regular, can we assume the seperating function to be bounded?

Post and Widder Inversion Formula for Laplace Transform

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

Is a boundary which consists of boundaries of balls Lipschitz?

Do $C^1$ domains share their outer normal field on the common part of their boundary

Questions concerning Trace Theorem (Evans - PDE)

Equivalence of Sobolev Norms via Fourier Transformation

Compact embedding of $H_0^1$ into $C([0,1])$

Sequence of series converges to improper integral

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

Lebesgue differentiation theorem and surface measure

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

Prove that the set $\{f \in L^2(\mathbb{R}^n)^n \mid \text{div} f = 0\}$ of divergence free vector fields is closed in $L^2$

Derivation of conservation laws in differential form