7,432 reputation
12657
bio website fa.its.tudelft.nl/~teuwen
location Delft, Netherlands
age 28
visits member for 4 years, 4 months
seen Dec 9 at 21:31

About me

I'm a PhD candidate in analysis (harmonic analysis). I have a Master of Science degree in mathematics (analysis).

I am interested in many topics in analysis, but in particular: harmonic analysis, functional analysis, operator theory and special functions.

My email address is jonasteuwen@gmail.com.

I would appreciate it if you would correct my spelling and grammatical errors.


Me elsewhere


Jan
22
answered Polynomial and spectrum of a Operator .
Jan
14
awarded  Nice Question
Jan
8
accepted On the regularity of the Laplace equations and tensor products and such
Jan
8
comment On the regularity of the Laplace equations and tensor products and such
Alright - thanks. Indeed, this is what I figured since I asked the question. But then I was wondering 'how bad' this could be - as in a splitting in a good and a bad part. Different question so I'll accept this.
Jan
8
comment On the regularity of the Laplace equations and tensor products and such
Alright, I seem to be totally misunderstanding things, so I have written how I think it is (but first: lunch). (I'll look at your edit later).
Jan
8
revised On the regularity of the Laplace equations and tensor products and such
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Jan
8
comment On the regularity of the Laplace equations and tensor products and such
In any case, I have rewritten it slightly. I do not want people to assume I am that stupid that I think tensor spaces are that trivial.
Jan
8
revised On the regularity of the Laplace equations and tensor products and such
deleted 35 characters in body
Jan
8
comment On the regularity of the Laplace equations and tensor products and such
@WillieWong I will rewrite it if you still think it is a 'logical fallacy' after my comment!
Jan
8
comment On the regularity of the Laplace equations and tensor products and such
Oops - logical fallacy is for me more like a error in verbal reasoning -. Anyway, I meant to say that it is a dense set in the tensor product. That is, a Schauder basis. Is that not true? When we separate we can find sequences of basis functions and then we construct the basis for the solution space as a Schauder basis.
Jan
4
revised Does there exist a diagonal dominance concept for integral kernels?
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Jan
4
comment Does there exist a diagonal dominance concept for integral kernels?
On every inner product space every self-adjoint operator $P$is positive if for all non-zero $u$ we have $\langle Pu, u \rangle > 0$.
Jan
4
comment Does there exist a diagonal dominance concept for integral kernels?
@SimenK. But, I do not see understand why my decomposition would not be the way to proceed. Self-adjointness amounts to real eigenvalues and so on.
Jan
3
answered Does there exist a diagonal dominance concept for integral kernels?
Jan
3
comment Does there exist a diagonal dominance concept for integral kernels?
So, is the question about the positivity of Hilbert-Schmidt operators? Hit it with the spectral theorem to decouple your kernel in that case.
Jan
3
comment Growth $\beta X\setminus X$ of a Banach space $X$
Yes, thank you for the link. I had something like that in mind - Topologically dualize a test function space and sqeeuze the Banach space in between.
Jan
3
answered Fundamental solutions of PDEs
Jan
2
comment Growth $\beta X\setminus X$ of a Banach space $X$
Nothing. Does that answer your question 8-)? I would like to know what $\beta W_0^{m, p}\setminus W_0^{m, p}$ is nevertheless.
Jan
2
revised Growth $\beta X\setminus X$ of a Banach space $X$
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Jan
2
revised Growth $\beta X\setminus X$ of a Banach space $X$
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