Martin Argerami's user avatar
Martin Argerami's user avatar
Martin Argerami's user avatar
Martin Argerami
  • Member for 12 years, 3 months
  • Last seen this week
17 votes
2 answers
1k views

Selfadjoint compact operator with finite trace

13 votes
1 answer
426 views

C$^*$-algebras: When is there equality in the triangle inequality?

11 votes
1 answer
510 views

The ideal generated by a non-compact operator

8 votes
1 answer
2k views

A linear map $S:Y^*\to X^*$ is weak$^*$ continuous if and only if $S=T^*$ for some $T\in B(X,Y)$

7 votes
2 answers
928 views

A characterization of trace class operators

7 votes
2 answers
445 views

Unitary orbit of the Jordan matrices

7 votes
1 answer
886 views

Convergence of Approximations of the Identity in $L^p(\mathbb R^d)$

7 votes
1 answer
302 views

Uncountably many non-homeomorphic compact subsets of the circle

5 votes
2 answers
330 views

Eigenvalues of certain Hankel matrix

5 votes
1 answer
270 views

Existence of conditional expectations onto masas.

5 votes
1 answer
125 views

Distance between two states in a C$^*$-algebra

4 votes
1 answer
153 views

Combinatorial identity from squaring the binomial expansion

4 votes
1 answer
225 views

Jordan decomposition of an endomorphism with minimal polynomial

3 votes
1 answer
605 views

Convex set: extreme points and distance to the origin

3 votes
1 answer
125 views

Riemann integral by definition [closed]

3 votes
1 answer
494 views

Strong convergence of projections in $B(H)$

3 votes
1 answer
219 views

Notation related to the Borel hierarchy

3 votes
1 answer
166 views

Supremum of a bounded set of real-valued functions in $L^\infty(X)$

3 votes
1 answer
785 views

Finitely generated module over $\mathbb Z$

2 votes
1 answer
99 views

Corners of the Unilateral Shift

0 votes
1 answer
81 views

Characterization of positive operators below an operator

0 votes
2 answers
89 views

Relation between different presentations of a positive semidefinite matrix