User Bill Johnson

9 votes

Accepted

Unique preduals up to (nonisometric) isomorphism?

answered Apr 13, 2011 at 13:10

9 votes

Which norms have rich isometry groups?

answered May 10, 2011 at 1:48

9 votes

Codimension of Measurable Sets

answered Feb 13, 2011 at 13:22

9 votes

Topological "Interpolation" ?

answered Jan 13, 2010 at 11:45

9 votes

Accepted

Finding closed subspaces whose sum isn't closed

answered Dec 23, 2022 at 23:20

9 votes

Accepted

The algebra of continuous functions on Cantor set

answered Jan 7, 2021 at 18:09

9 votes

Accepted

Basis vs Schauder basis in normed spaces

answered May 10, 2020 at 21:52

9 votes

Accepted

Weak* continuity of positive parts

answered May 20, 2016 at 21:11

8 votes

Accepted

Construction of a codimension 1 dense subspace without Zorn

answered Aug 1, 2016 at 14:40

8 votes

Accepted

Is there an easier proof to show that the closed convex hull of a normalized weakly null sequence is weakly compact?

answered Sep 12, 2015 at 23:21

8 votes

Nonseparable counterexamples in analysis

answered May 10, 2021 at 21:35

8 votes

What's a nice argument that shows the volume of the unit ball in $\mathbb R^n$ approaches 0?

answered Jan 27, 2010 at 19:52

8 votes

A book for problems in Functional Analysis

answered Jan 31, 2010 at 18:48

8 votes

Continuous automorphism groups of normed vector spaces?

answered Jan 31, 2010 at 23:28

8 votes

Accepted

Nonseparable Hilbert spaces as quotients of spaces of bounded functions

answered May 2, 2010 at 18:57

8 votes

Does Cauchy continuity imply uniform continuity? [No.]

answered Jun 12, 2010 at 5:46

8 votes

Existence of extreme points

answered Mar 21, 2011 at 17:15

8 votes

Accepted

Question about 0-dimensional Polish spaces

answered Oct 29, 2011 at 4:15

8 votes

Accepted

A criterion for the sum of two closed sets to be closed ?

answered Feb 14, 2012 at 15:24

8 votes

Accepted

Projection exists ⇒ Uniformly convex?

answered Nov 27, 2011 at 17:35

8 votes

Accepted

Subspaces of $l_p$ and Banach-Mazur distance

answered Jan 13, 2013 at 18:05

8 votes

Simultaneously extending the functionals of a subspace of a Banach space to the whole space

answered Mar 20, 2014 at 14:11

8 votes

Accepted

Sequential continuity of linear operators

answered Oct 1, 2013 at 18:21

7 votes

Accepted

Dual Banach space of $B(X,Y)$ when $X$ is finite dimensional

answered Oct 21, 2013 at 14:41

7 votes

Counterexample of non-negative sequence weakly converging in $\mathscr{M}^1$ but not $L^1$

answered May 24, 2013 at 4:18

7 votes

Accepted

Tokarev's theorem on Banach lattices which are Grothendieck spaces

answered Jun 12, 2014 at 16:28

7 votes

Approaching convex and discrete geometry from other disciplines

answered Aug 22, 2014 at 23:29

7 votes

Accepted

Extending compact operators

answered Oct 15, 2014 at 18:04

7 votes

Accepted

Do ultrapowers of classical Banach spaces have unconditional bases?

answered May 18, 2012 at 5:32

7 votes

Do subalgebras of C(X) admit a description in terms of the compact Hausdorff space X?

answered Dec 5, 2011 at 15:38

Stack Exchange Network

406 Answers

Unique preduals up to (nonisometric) isomorphism?

Which norms have rich isometry groups?

Codimension of Measurable Sets

Topological "Interpolation" ?

Finding closed subspaces whose sum isn't closed

The algebra of continuous functions on Cantor set

Basis vs Schauder basis in normed spaces

Weak* continuity of positive parts

Construction of a codimension 1 dense subspace without Zorn

Is there an easier proof to show that the closed convex hull of a normalized weakly null sequence is weakly compact?

Nonseparable counterexamples in analysis

What's a nice argument that shows the volume of the unit ball in $\mathbb R^n$ approaches 0?

A book for problems in Functional Analysis

Continuous automorphism groups of normed vector spaces?

Nonseparable Hilbert spaces as quotients of spaces of bounded functions

Does Cauchy continuity imply uniform continuity? [No.]

Existence of extreme points

Question about 0-dimensional Polish spaces

A criterion for the sum of two closed sets to be closed ?

Projection exists ⇒ Uniformly convex?

Subspaces of $l_p$ and Banach-Mazur distance

Simultaneously extending the functionals of a subspace of a Banach space to the whole space

Sequential continuity of linear operators

Dual Banach space of $B(X,Y)$ when $X$ is finite dimensional

Counterexample of non-negative sequence weakly converging in $\mathscr{M}^1$ but not $L^1$

Tokarev's theorem on Banach lattices which are Grothendieck spaces

Approaching convex and discrete geometry from other disciplines

Extending compact operators

Do ultrapowers of classical Banach spaces have unconditional bases?

Do subalgebras of C(X) admit a description in terms of the compact Hausdorff space X?