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M.González
  • Member for 8 years, 8 months
  • Last seen this week
  • Santander, Spain
12 votes
Accepted

When is the closed unit ball in a smaller Banach space closed in a larger Banach space?

12 votes

Injectivity implies surjectivity

11 votes
Accepted

Weakly compact operators between Banach spaces

10 votes

Ideal of strictly singular operators

8 votes
Accepted

Existence of operator with certain properties

7 votes
Accepted

Are nuclear operators closed under extensions?

7 votes
Accepted

For which $f \in L^2([0,1])$ is $f^\perp \cap C^\infty$ dense in $f^\perp$?

7 votes

reflexive banach space

6 votes
Accepted

On hereditarily reflexive Banach spaces

5 votes

When is it $C(X)$?

5 votes

Is $\beta \mathbb{N}$ homeomorphic to its own square?

4 votes

Extracting subsequences in Banach spaces, along an ultrafilter?

4 votes

Is the "closedness of the image of operator" needed in the defintion of Fredholm operators?

4 votes

Bidual of subspaces of $L_1$

4 votes
Accepted

Example of measure of non-compactness

4 votes
Accepted

Sum of subspaces is closed iff inclination is positive

3 votes

Reference for invariance of essential spectrum under relatively compact perturbations

3 votes
Accepted

Unbounded Component of the Fredholm Domain

3 votes

Essential spectrum under perturbation

3 votes

Historical developement of analysis and partial differential equations (especially in the 20th century)

2 votes
Accepted

Continuous depedence of the spectrum on elements

2 votes

Equality of spectra of products of operators

2 votes

Duals of ideals of operators between Banach spaces

2 votes
Accepted

Duals of ideals of operators between Banach spaces

2 votes

"Twisted" direct sums of Banach spaces

1 vote

Regarding essential spectrum of the unilateral shift operator

1 vote

What is the structure of a Banach space $X$ when $Y$ and $X/Y$ are hereditarily indecomposable?

1 vote
Accepted

Two measures of noncompactness of operators

1 vote
Accepted

Is the kernel of a Fredholm operator stable under perturbation?

1 vote

Regarding approximation by invertible operators