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Jochen

Member for 10 years, 9 months
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math.uni-trier.de/~wengenroth

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functional-analysis

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16

Finite dimensional subspace of $C([0,1])$

Mar 26, 2014

12

Prove the set of sequences $c_0$ which converge to zero in $l_{\infty}$ is closed.

Mar 11, 2014

12

Can we prove the chain rule without using an artificial trick?

Nov 20, 2022

11

Question about sum of l'p spaces

Aug 31, 2013

11

If $f(x) + f'(x) + f''(x) \to A$ as $x \to \infty$, then show that $f(x) \to A$ as $x \to \infty$

Mar 25, 2014

Questions

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15

Spectral theorem for unbounded self-adjoint operators on REAL Hilbert spaces

Jan 14, 2014

9

How much bigger is the power set -- explicitly

Dec 1, 2019

9

Does Tychonov's theorem imply Zorn's lemma

Nov 17, 2022

6

Binary expansions

Mar 8, 2013

6

Proof of the Ham-Sandwich theorem

May 4, 2013

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functional-analysis

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real-analysis

131

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68

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topological-vector-spaces

91

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51

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banach-spaces

87

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46

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general-topology

82

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50

posts

Reputation

+40

Show that $\exp \begin{pmatrix} x & -y\\ y & x\end{pmatrix}= \exp(x) \begin{pmatrix} \cos y& -\sin y\\ \sin y& \cos y\end{pmatrix}$

+25

Is $C^\infty([0,1]^n)$ a separable Frechet space?

+10

Arzelà–Ascoli theorem for the space $C_b^k(\overline{\Omega})$

+10

Show that the Open Mapping Theorem requires both spaces to be complete

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Jan 31, 2019
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