User Hannes Thiel

11 votes

What spaces can be obtained from $\mathbb{R}^{n}$ by taking quotient spaces and subspaces?

answered Feb 4, 2014 at 17:11

9 votes

Is every maximal ideal in a C*-algebra always closed?

answered Oct 10, 2020 at 20:05

8 votes

Which C*-algebras are complemented in their bidual?

answered Nov 26, 2016 at 15:16

6 votes

Accepted

Finite codimensional subvector space of $C^{*}$ algebras which contains no invertible elements

answered Mar 2, 2015 at 10:56

6 votes

Almost idempotent approximate units in C*-algebras

answered Feb 16, 2016 at 21:24

4 votes

Accepted

Do c.p.c. order zero maps between local C-algebras map C-subalgebras to C*-subalgebras?

answered May 4, 2015 at 12:27

4 votes

Is the space of -homomorphisms between two $C^$-algebras locally path connected

answered May 15, 2014 at 16:16

4 votes

Classification of $C^*$ algebras whose all non scalar elements have disconnected spectrum

answered Jul 3, 2017 at 7:21

4 votes

connected stable rank

answered Feb 6, 2020 at 8:02

4 votes

Accepted

Local cross-sections for free actions of finite groups

answered Aug 19, 2020 at 18:15

4 votes

C$^*$-algebras isomorphic after tensoring

answered Sep 10, 2020 at 8:24

3 votes

The closure of selfadjoint elements of an algebra whose spectrum consist of rational numbers

answered Feb 27, 2022 at 19:48

2 votes

Transitivity of the Cuntz sub-equivalence

answered Oct 29, 2016 at 18:31

2 votes

Accepted

Totally non hereditary $C^{*}$-subalgebras

answered Feb 25, 2015 at 18:31

1 vote

All AI-algebras are AT-algebras

answered Mar 3, 2015 at 9:22

Stack Exchange Network

15 Answers

What spaces can be obtained from $\mathbb{R}^{n}$ by taking quotient spaces and subspaces?

Is every maximal ideal in a C*-algebra always closed?

Which C*-algebras are complemented in their bidual?

Finite codimensional subvector space of $C^{*}$ algebras which contains no invertible elements

Almost idempotent approximate units in C*-algebras

Do c.p.c. order zero maps between local C-algebras map C-subalgebras to C*-subalgebras?

Is the space of -homomorphisms between two $C^$-algebras locally path connected

Classification of $C^*$ algebras whose all non scalar elements have disconnected spectrum

connected stable rank

Local cross-sections for free actions of finite groups

C$^*$-algebras isomorphic after tensoring

The closure of selfadjoint elements of an algebra whose spectrum consist of rational numbers

Transitivity of the Cuntz sub-equivalence

Totally non hereditary $C^{*}$-subalgebras

All AI-algebras are AT-algebras