Sebastian Bechtel's user avatar
Sebastian Bechtel's user avatar
Sebastian Bechtel's user avatar
Sebastian Bechtel
  • Member for 9 years
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4 votes
Accepted

Equivalence of complete norms

4 votes

Insights into linear algebra from abstract algebra

4 votes
Accepted

proof: Hilbert Schmidt operator is compact

3 votes

Applications of functional calculus

3 votes
Accepted

Bochner-Sobolev space vs. Sobolev space on product via Fubini-Tonelli?

2 votes

Can every closed subspace be realized as kernel of a bounded linear operator from a Banach space to itself?

2 votes
Accepted

atomic decomposition of Hardy spaces: support question

2 votes
Accepted

a linear map is open if and only if the image of the unit ball contains a ball around 0

2 votes

Is it possible when multiplying two polynomials that, after collecting similar terms, all terms vanish?

1 vote

Can every Banach space be given an inner product homeomorphically?

1 vote

Help proving Calderón reproducing formula (simple version)

1 vote
Accepted

Why is the annihilator of $c_0 = {0}$?

1 vote

$f$ is continuous iff $f^{-1}(U)$ is open for all open $U$.

1 vote

General Concept of an Isomorphism

1 vote

Prove that ($\mathbb{R}$, $\le$) is a partial order

1 vote

A weird condition that implies continuity

1 vote

What are some mathematical topics that involve adding and multiplying pictures?

1 vote
Accepted

Show that A is a bounded operator in ℓ2 and ∥A∥2≤∑∞j=1∑∞i=1|aij|2

0 votes

Double series and series

0 votes
Accepted

Is the null set $\emptyset$ a real subset of any set?

0 votes

How to construct the DFA for the following question?

0 votes
Accepted

total variation for closed set zero if measure is zero on closed subsets

0 votes

Compact submanifold has no global parametrization

0 votes

compact operator and bounded operator

0 votes

Closure under matrix multiplication for 2x2 matrices

0 votes

Let A be a 2×2 matrix, y an invariant line of A, and P a point on y. Is P necessarily an eigenvector of A?