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visits | member for | 3 years, 1 month |
seen | Apr 22 at 11:31 | |
stats | profile views | 2,850 |
Apr 22 |
comment |
Characterizations of Wiener algebra
Thanks for your answer. Question (1) was only intended to clarify the priorities in a reference list. |
Apr 21 |
asked | Characterizations of Wiener algebra |
Mar 19 |
asked | Lipschitz-free spaces of $\mathbb R^n$ |
Mar 13 |
comment |
Predual of a subspace
Great, thank you very much. |
Mar 12 |
comment |
Predual of a subspace
Yes, I mean weak-star closed. |
Mar 12 |
revised |
Predual of a subspace
deleted 15 characters in body; edited title |
Mar 12 |
asked | Predual of a subspace |
Mar 11 |
answered | Structure of sign changes under the heat flow |
Mar 5 |
asked | Global existence for infinite dimensional ODE |
Mar 5 |
awarded | Yearling |
Mar 5 |
answered | Boundedness of a singular integral operator on $L^p(\mathbb{R})$, $1<p<\infty$ |
Mar 3 |
comment |
Infinite dimensional Cauchy-Lipschitz theorem
Thanks for your answer, you are right. |
Mar 3 |
comment |
Infinite dimensional Cauchy-Lipschitz theorem
For a counterexample to Peano's theorem in infinite dimension, check for instance Exercise 18, page IV.41 of the Bourbaki’s volume Fonctions d'une variable réelle. |
Mar 2 |
asked | Infinite dimensional Cauchy-Lipschitz theorem |
Feb 11 |
comment |
Non-separable Banach space
Illuminating! Thanks. |
Feb 10 |
asked | Non-separable Banach space |
Feb 7 |
comment |
Extremal eigenvalues & eigenvectors of skew-adjacency matrix
How about calculating $\sqrt{B^*B}=\vert B\vert$? |
Feb 6 |
answered | Extremal eigenvalues & eigenvectors of skew-adjacency matrix |
Feb 2 |
comment |
Surjectivity of curl
@Denis Serre: I do not understand your Borel-type argument for the smoothness of $w^0$ at the origin. The size of $w_k$ on the sphere could be anything and your argument ("differs from…") would provide smoothness for $\sum_{k\ge 0}\phi(kx)a_k x^k$ for any sequence. Given a sequence $(a_k)_{k\ge 0}$, it is possible to choose a sequence $(\mu_k)_{k\ge 0}$ (depending heavily on the $a_k$) such that $\sum_{k\ge 0}\phi(\mu_k x)a_k x^k$ is smooth (i.e. $C^\infty$). |
Feb 1 |
comment |
Series estimate
Nice shot, thanks. |