Tomasz Kania's user avatar
Tomasz Kania's user avatar
Tomasz Kania's user avatar
Tomasz Kania
  • Member for 12 years, 10 months
  • Last seen this week
17 votes
0 answers
830 views

Ramsey's theorem for the first uncountable ordinal

15 votes
1 answer
671 views

Open bilinear maps that are not uniformly open

15 votes
2 answers
916 views

Distinguishing topologically weak topologies of Banach spaces

14 votes
2 answers
1k views

Order-preserving operator norms

13 votes
1 answer
421 views

Discrete subsets in the topology of pointwise convergence vs. metrisability

12 votes
0 answers
448 views

Is there a simple and reflexive Banach algebra?

12 votes
5 answers
2k views

Jonsson Boolean algebras?

12 votes
1 answer
437 views

Maximal ideals of ultraproducts of full matrix algebras

10 votes
0 answers
257 views

Are biduals of spaces of differentiable functions on hypercubes Grothendieck?

10 votes
1 answer
574 views

Grothendieck spaces and total subspaces of the dual

10 votes
0 answers
248 views

Do sufficiently large Banach spaces admit non-compact operators with not too large range?

10 votes
0 answers
182 views

Masas in SAW*-algebras

9 votes
0 answers
254 views

Can we extend c.p. normal maps on a finite von Neumann algebra $M$ to $L_0(M)_+$?

9 votes
0 answers
473 views

The approximation property of group C*-algebras

9 votes
0 answers
880 views

Weak compactness in $\mathcal{F}(X)$

9 votes
1 answer
407 views

Towards the complex unit conjecture

8 votes
1 answer
319 views

Tokarev's theorem on Banach lattices which are Grothendieck spaces

8 votes
2 answers
333 views

Non-density of invertible elements in $\ell_1(\mathbb{N}_0)$

8 votes
5 answers
463 views

Ideals on $\mathbb N$ and large sets that have small intersection

7 votes
0 answers
200 views

Equivalent strictly convex norms in spaces of small density

7 votes
1 answer
477 views

Is $L_q(X^*)$ complemented in $(L_p(X))^*$?

7 votes
0 answers
551 views

The Banach space of bounded functions with countable support

7 votes
2 answers
651 views

Subspaces isomorphic to $C[0, \omega_1]$

7 votes
3 answers
354 views

Extracting countable chains from linear orders

7 votes
1 answer
262 views

Does every infinite-dimensional Banach algebra contain an infinite-dimensional subalgebra with second-countable primitive ideal space?

7 votes
1 answer
174 views

Projective tensor product of injective operators

7 votes
0 answers
122 views

The bidual of the space of divergence-free vector fields

6 votes
1 answer
175 views

Certain interpolation property of von Neumann algebras

6 votes
0 answers
99 views

Is every separable Banach space with the MAP 1-complemented in a space with a monotone basis?

6 votes
3 answers
1k views

Space of compact operators