1,725 reputation
526
bio website www-ian.math.uni-magdeburg.de/…
location Magdeburg, Germany
age 31
visits member for 3 years, 4 months
seen Mar 31 at 2:25

I am an Australian mathematician.


Jan
19
awarded  Commentator
Jan
19
comment Why does every 7-manifold bound an 8-manifold?
Apologies for my earlier ignorant response. I didn't appreciate the intricate nature of the question. I would also like to second Jim's suggestion: it might be profitable to post this at MathOverflow.
Jan
19
awarded  Peer Pressure
Jan
14
comment How to create a graycode of N bits with a code-agnostic iteration function
@TonyK: I know, I like to think of them as (Hamiltonian) cycles in an n-cube. I was suggesting that perhaps frLich could improve the question. I did a little work on Gray codes, but it isn't computationally efficient and so not applicable to this question. Shame ;).
Jan
13
comment How to create a graycode of N bits with a code-agnostic iteration function
You should define what a Gray code is, at least.
Jan
13
answered How does one characterize surfaces with constant nonzero Gaussian and mean curvature
Jan
7
comment Are there any countable Hausdorff connected spaces?
I believe Qiaochu is only implying that my 'singleton' response was not a valid example.
Jan
7
comment Are there any countable Hausdorff connected spaces?
I thought so :). I added a reference that you might find interesting. In general these things are quite strange. But I guess you can get more out of Theo's link.
Jan
7
revised Are there any countable Hausdorff connected spaces?
added 139 characters in body
Jan
7
answered Are there any countable Hausdorff connected spaces?
Dec
10
answered Does saying “to negate a sign of a const term” has a meaning
Dec
10
awarded  Supporter
Dec
9
awarded  Autobiographer
Dec
9
awarded  Teacher
Dec
9
awarded  Editor
Dec
9
comment Integer translates of a scaling function
@AgCl: No worries, edited.
Dec
9
revised Integer translates of a scaling function
added 12 characters in body
Dec
8
comment Integer translates of a scaling function
@AgCl: OK. I just looked it up in a paper, Mallat 1989, 'Multiresolution approximations and wavelet orthonormal bases of L^2'. Theorem 1 (in particular Equations (23), (36)) is, I think, what you are after. It is far from immediate, longer to prove than I immediately thought. Perhaps there is a very fast proof but I can't think of it now. I could reproduce the proof there if you wish, although it would probably be better to just read the paper.
Dec
8
comment Integer translates of a scaling function
@AgCl: What was in my mind when I wrote that was possibly using a sequence of scaled characteristic functions on longer and longer intervals, something like f_l = 2^-l\chi_{[-l,l]}. But now I think about it some more, this doesn't seem to work. I think I should just delete my answer until I think of a better idea, yes?
Dec
7
answered Integer translates of a scaling function