Per Alexandersson

Zurich, Switzerland

www2.math.su.se/~per

Age: 27

Currently interested in Schur functions and semistandard Young tableaux and misc. related representation theory and combinatorics.

Phd thesis defended 2013, titled Combinatorial Methods in Complex Analysis.

I keep an eye out for interesting results related to complex dynamics, computability, and computer-assisted research. I use Mathematica extensively in my research. My other main programming languages are Java, LaTeX, PHP, C, etc.

5h
reviewed Approve suggested edit on Is there a citeable reference for star-shaped open subsets of R^n being diffeomorphic to R^n?
Feb
27
comment Prove an equation is always false
Well, $\zeta(z)=0$ together with the condition $0<Re(z)<1/2$ is considered a "pretty hard" equation, so don't expect a general method.
Feb
26
reviewed Approve suggested edit on Applications of Chevalley Restriction Theorem
Feb
26
awarded Good Answer
Feb
17
awarded Yearling
Feb
16
comment A possibly surprising appearance of Fibonacci numbers
This is worded like homework.. can you give maybe more background on this problem?
Feb
13
accepted Unexpected result for Coefficient[]
Feb
11
awarded Yearling
Feb
11
awarded Yearling
Feb
6
comment What do you do if you believe a problem is undecidable?
I was thinking at the same type of problem as Anthony. Also, more similar maybe, given a collection of integer 3x3-matrices, determining if any product of these matrices is the zero matrix, is also undecidable.
Feb
5
reviewed Approve suggested edit on Is there a Poisson Summation formula for imprimitive Dirichlet characters?
Feb
4
comment Knowledge indicators
Traffic lights has a blue component in the green light, making it easy for colorblinds to see the difference. Also, the green light is always at the bottom.
Feb
4
comment Knowledge indicators
Red and green is usually really bad to use... (colorblind).
Jan
30
comment Sets of points containing permutations - a Ramsey-type question
Have you run any computer experiments on this?
Jan
27
comment Tiling with restricted overlap
Ah, I suspected that there was such an example! Thank you very much for this!
Jan
26
comment Why doesn't Python have a "flatten" function for lists?
It is built-in in Mathemaica, and I use it extensively.
Jan
26
asked Tiling with restricted overlap
Jan
26
comment Certain signed sum over $S_n$
That is a very nice observation!
Jan
25
comment Certain signed sum over $S_n$
Ah, nice! I had a feeling there was some counterexample. The case I was studying in particular, only concerns certain subgroups. Perhaps the statement is true for these, see my edit...
Jan
25
revised Certain signed sum over $S_n$
added 180 characters in body
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