User M.González

15 votes

1 answer

2k views

Quotients of $\ell_\infty$ by separable subspaces

asked Nov 15, 2013 at 7:50

13 votes

2 answers

610 views

Is there a Gelfand-Naimark-like characterization of group algebras $L_1(G)$?

asked Sep 15, 2015 at 15:36

12 votes

3 answers

1k views

Banach spaces $X$ with $\ell_2(X)$ not isomorphic to $L_2([0,1],X)$

asked Dec 2, 2015 at 10:41

11 votes

1 answer

2k views

Bounded operator on a normed space with empty spectrum

asked Nov 28, 2014 at 10:33

11 votes

0 answers

620 views

Subspaces and quotients in Banach space theory

asked Jun 12, 2015 at 10:36

10 votes

1 answer

515 views

Complemented subspaces in the dual of James' space $J$

asked Jan 14, 2016 at 16:33

9 votes

1 answer

1k views

Counterintuitive consequences of the Hahn-Banach theorem

asked Nov 5, 2014 at 16:21

9 votes

1 answer

242 views

On hereditarily reflexive Banach spaces

asked Jul 13, 2020 at 17:57

8 votes

0 answers

357 views

Ultrapowers of Banach spaces without the continuum hypothesis

asked Oct 10, 2013 at 7:08

8 votes

0 answers

1k views

On the classification of injective Banach spaces

asked Feb 6, 2014 at 16:12

7 votes

0 answers

293 views

Complex interpolation of a Banach space and its antidual when the space has a basis

asked Oct 29, 2013 at 17:21

7 votes

1 answer

195 views

Self-dual Orlicz sequence spaces

asked Aug 9, 2021 at 11:56

6 votes

1 answer

251 views

Finite representability of $\ell_p$ in subspaces of $L_p(0,1)$

asked Mar 31, 2023 at 15:35

6 votes

1 answer

417 views

Reflexive subspaces of non-separable abstract $L_1$ spaces

asked Nov 27, 2014 at 10:43

6 votes

1 answer

2k views

Existence of injective operators with dense range

asked Feb 21, 2014 at 19:54

6 votes

0 answers

175 views

Ultrapowers and complemented subspaces

asked Mar 30, 2014 at 10:06

6 votes

0 answers

532 views

Products of spaces containing no copies of $\ell_2(\Gamma)$

asked Apr 12, 2014 at 15:18

6 votes

2 answers

455 views

Subspaces of $\ell_p$ ($1<p<\infty$, $p\neq 2$) not isomorphic to $\ell_p$

asked Dec 7, 2019 at 19:48

5 votes

1 answer

189 views

Subsequences of an orthonormal basis generating a strongly embedded subspace in $L_2(0,1)$

asked Oct 18, 2019 at 14:44

5 votes

1 answer

109 views

Simultaneous near-best approximation with respect to two norms

asked Nov 30, 2016 at 11:44

5 votes

0 answers

133 views

Banach spaces admitting no proper quasi-affinity

asked Jun 13, 2014 at 15:13

5 votes

2 answers

177 views

Subprojective Orlicz sequence spaces

asked May 26, 2021 at 9:41

4 votes

1 answer

281 views

Does property (V) imply the Grothendieck property for dual Banach spaces?

asked May 3, 2022 at 12:39

4 votes

1 answer

169 views

The complement of $L_1(0,1)$ in $L_1(0,1)^{**}$

asked Sep 20, 2022 at 17:43

4 votes

0 answers

73 views

The embedding of a Banach lattice in an ultrapower

asked Oct 3, 2022 at 9:19

4 votes

0 answers

260 views

On the predual of the James tree space $\mathit{JT}$

asked Nov 17, 2023 at 15:53

4 votes

0 answers

313 views

MOOC's courses on Functional analysis [closed]

asked Apr 27, 2020 at 8:14

4 votes

0 answers

534 views

$L_\infty(\mu)$ spaces non-isomorphic to a dual space

asked Jul 13, 2015 at 15:39

4 votes

1 answer

289 views

Copies of $c_0$ in $C[0,1]$ and disjoint sequences

asked Nov 16, 2019 at 11:46

4 votes

0 answers

166 views

Is this property an isomorphic characterization of $\ell_1(\Gamma)$?

asked May 21, 2018 at 16:35

Stack Exchange Network

49 Questions

Quotients of $\ell_\infty$ by separable subspaces

Is there a Gelfand-Naimark-like characterization of group algebras $L_1(G)$?

Banach spaces $X$ with $\ell_2(X)$ not isomorphic to $L_2([0,1],X)$

Bounded operator on a normed space with empty spectrum

Subspaces and quotients in Banach space theory

Complemented subspaces in the dual of James' space $J$

Counterintuitive consequences of the Hahn-Banach theorem

On hereditarily reflexive Banach spaces

Ultrapowers of Banach spaces without the continuum hypothesis

On the classification of injective Banach spaces

Complex interpolation of a Banach space and its antidual when the space has a basis

Self-dual Orlicz sequence spaces

Finite representability of $\ell_p$ in subspaces of $L_p(0,1)$

Reflexive subspaces of non-separable abstract $L_1$ spaces

Existence of injective operators with dense range

Ultrapowers and complemented subspaces

Products of spaces containing no copies of $\ell_2(\Gamma)$

Subspaces of $\ell_p$ ($1<p<\infty$, $p\neq 2$) not isomorphic to $\ell_p$

Subsequences of an orthonormal basis generating a strongly embedded subspace in $L_2(0,1)$

Simultaneous near-best approximation with respect to two norms

Banach spaces admitting no proper quasi-affinity

Subprojective Orlicz sequence spaces

Does property (V) imply the Grothendieck property for dual Banach spaces?

The complement of $L_1(0,1)$ in $L_1(0,1)^{**}$

The embedding of a Banach lattice in an ultrapower

On the predual of the James tree space $\mathit{JT}$

MOOC's courses on Functional analysis [closed]

$L_\infty(\mu)$ spaces non-isomorphic to a dual space

Copies of $c_0$ in $C[0,1]$ and disjoint sequences

Is this property an isomorphic characterization of $\ell_1(\Gamma)$?