User Hannes Thiel

31 votes

0 answers

1k views

When are two C*-algebras isomorphic as Banach spaces?

asked Feb 3, 2014 at 23:01

28 votes

2 answers

1k views

What is the Banach-Mazur distance between $\ell_\infty$ and $L_\infty$?

asked Jun 8, 2016 at 19:53

16 votes

2 answers

682 views

Ultraweak topology on B(X): Is the map X\otimes X* -> B(X)* isometric?

asked Feb 25, 2015 at 19:46

15 votes

2 answers

1k views

Is a C*-algebra with an isomorphic predual a von Neumann algebra?

asked Jul 16, 2016 at 19:58

15 votes

1 answer

440 views

Weak*-closure of finite rank operators on dual space

asked Feb 12, 2016 at 10:06

12 votes

1 answer

746 views

Which topological spaces are coset spaces of locally compact groups?

asked May 6, 2013 at 16:35

11 votes

2 answers

638 views

von Neumann algebras as C*-algebras with multiplicative conditional expectation $A^{**}\to A$

asked Mar 25, 2016 at 16:32

9 votes

1 answer

726 views

Uniform Embedding into Euclidean Space

asked Jul 5, 2012 at 15:33

9 votes

0 answers

122 views

Real Rank of $M_n(A)$

asked Jan 30, 2020 at 10:55

9 votes

1 answer

355 views

Scottish Book Problem 172

asked Oct 7, 2020 at 21:08

9 votes

0 answers

163 views

Moore-Penrose partial isometries and hermitian elements

asked Oct 29 at 14:46

8 votes

1 answer

286 views

Commutator ideal in nonunital C*-algebra

asked Aug 28, 2022 at 12:09

8 votes

1 answer

174 views

Is the bitranspose continuous for the $\sigma$-strong topology?

asked Mar 28, 2021 at 13:35

8 votes

1 answer

164 views

Special nilpotent elements

asked May 3, 2021 at 17:58

8 votes

1 answer

1k views

Is the p-norm of a matrix strictly log-convex?

asked May 15, 2014 at 15:44

8 votes

2 answers

812 views

Weak*-norm continuous operators on von Neumann algebras

asked Jan 29, 2017 at 10:56

7 votes

1 answer

281 views

Norm in the minimal tensor product of C*-algebras

asked Aug 18 at 20:48

6 votes

0 answers

453 views

Does the Approximation Property (AP) pass to quotients by amenable subgroups?

asked Mar 5, 2015 at 9:26

5 votes

1 answer

383 views

Projective resolutions for commutative monoids

asked Mar 2, 2016 at 11:00

5 votes

0 answers

329 views

Reflexive Operator Algebra

asked May 3, 2018 at 12:01

4 votes

2 answers

227 views

Root of positive function in Fourier algebra

asked Mar 4, 2015 at 14:26

4 votes

1 answer

218 views

Inverse limits of perfect groups

asked Dec 27, 2017 at 18:42

4 votes

0 answers

114 views

Weakenings of the Bounded Approximation Property

asked Feb 9, 2016 at 22:10

4 votes

1 answer

158 views

Coarsely trivial Borel cross section for $G\to G/N$

asked Mar 2, 2015 at 16:19

3 votes

1 answer

260 views

For a cross section $\sigma\colon G/N\to G$, how is $\sigma(y)^{-1}\sigma(x)^{-1}\sigma(xy)$ called?

asked Mar 3, 2015 at 8:55

3 votes

1 answer

435 views

Inductive colimits of free groups

asked Dec 27, 2017 at 18:46

3 votes

1 answer

110 views

Continuity of linear bijection that is continuous on ideal and quotient

asked May 19, 2021 at 21:12

Stack Exchange Network

27 Questions

When are two C*-algebras isomorphic as Banach spaces?

What is the Banach-Mazur distance between $\ell_\infty$ and $L_\infty$?

Ultraweak topology on B(X): Is the map X\otimes X* -> B(X)* isometric?

Is a C*-algebra with an isomorphic predual a von Neumann algebra?

Weak*-closure of finite rank operators on dual space

Which topological spaces are coset spaces of locally compact groups?

von Neumann algebras as C*-algebras with multiplicative conditional expectation $A^{**}\to A$

Uniform Embedding into Euclidean Space

Real Rank of $M_n(A)$

Scottish Book Problem 172

Moore-Penrose partial isometries and hermitian elements

Commutator ideal in nonunital C*-algebra

Is the bitranspose continuous for the $\sigma$-strong topology?

Special nilpotent elements

Is the p-norm of a matrix strictly log-convex?

Weak*-norm continuous operators on von Neumann algebras

Norm in the minimal tensor product of C*-algebras

Does the Approximation Property (AP) pass to quotients by amenable subgroups?

Projective resolutions for commutative monoids

Reflexive Operator Algebra

Root of positive function in Fourier algebra

Inverse limits of perfect groups

Weakenings of the Bounded Approximation Property

Coarsely trivial Borel cross section for $G\to G/N$

For a cross section $\sigma\colon G/N\to G$, how is $\sigma(y)^{-1}\sigma(x)^{-1}\sigma(xy)$ called?

Inductive colimits of free groups

Continuity of linear bijection that is continuous on ideal and quotient