Stack Exchange

Jonas Dahlbæk

top accounts reputation activity subscriptions

Top Questions

Non-examples for the Kato-Rellich Theorem

linear-algebra functional-analysis pde hilbert-spaces examples-counterexamples asked Jul 6, 2014 at 19:15

math.stackexchange.com

The strong operator limit of a sequence of unitary operators

hilbert-spaces examples-counterexamples operator-algebras asked Sep 1, 2014 at 19:49

math.stackexchange.com

Does every closed, densely defined operator in a Banach space have a closed, densely defined extension on a Hilbert space?

operator-theory hilbert-spaces banach-spaces unbounded-operators asked Jan 20, 2015 at 22:06

math.stackexchange.com

Lebesgue measure without choice

measure-theory lebesgue-measure axiom-of-choice asked Apr 20, 2015 at 7:19

math.stackexchange.com

Top Answers

Norm of self-adjoint operator

math.stackexchange.com

Integrating $x^2e^{-x}$ using Feynman's trick?

math.stackexchange.com

Why are randomly drawn vectors nearly perpendicular in high dimensions

math.stackexchange.com

Upper bound for the rank of a nilpotent matrix , if $A^2 \ne 0$

math.stackexchange.com

Can a self-adjoint operator have no eigenvalues?

math.stackexchange.com

Forgotten old results break my motivation

math.stackexchange.com

Prove $ne^{-n}$ converges to zero

math.stackexchange.com

Do eigenvectors of Hermitian operators span the space in infinite dimensions?

math.stackexchange.com

Trace of non-negative self-adjoint integral operator

math.stackexchange.com

What are the most overpowered theorems in mathematics?

math.stackexchange.com

Can we determine the injectivity of a map $\mathbb{R}^n \rightarrow \mathbb{R}^n$ on subset of $\mathbb{R}^n$ by looking at the Jacobian?

math.stackexchange.com

Fourier-Transformation of Operator

math.stackexchange.com

When is Leibniz' notation for derivatives useful?

math.stackexchange.com

Hermitian and self-adjoint operators on infinite-dimensional Hilbert spaces

math.stackexchange.com