Per Alexandersson

Zurich, Switzerland

www2.math.su.se/~per

Age: 28

Currently interested in Schur functions, key Polynomials 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.

Oh, and I like generative art.

12h
reviewed Approve suggested edit on Counting subspaces
17h
reviewed Approve suggested edit on arithmetic progressions with few primes
1d
answered arXiv vs MathOverflow - popularity of disciplines
1d
comment Permutation equivalence classes with kendall-tau distance
Ah, right, yes, that makes sense.
1d
comment Recent progress on the busy beaver problem?
It is quite unclear what you mean by the busy beaver problem. It is known to be an incomputable function, so it is not really possible to get anything useful from it.
1d
revised Permutation equivalence classes with kendall-tau distance
added wiki link for terminology
1d
comment Permutation equivalence classes with kendall-tau distance
You mean $a_{\sigma(i+1)}$ when you write $\sigma(a_{i+1})$ etc, or am I wrong? Your notation can be improved a bit, for readability, I guess..
2d
answered Is it normal to go to a conference/workshop without a publication?
2d
comment Majorization and Schur Polynomials
Perhaps it is possible to introduce a second set of variables, and look at double Schur functions as well...
2d
comment Minimal number of intersections in a convex $n$-gon?
Is there some case when the regular polygon does not give the minimal number of intersection points?
2d
comment An algebraic strengthening of the Saturation Conjecture
Is there a combinatorial interpretation for some special case (similar to Yamanouchi tableaux for the LR-coeffs)? The saturation conjecture implies the analogous statement for Kosktka and skew Kosktka coefficients, so is there a "Kostka"-analogue of this question, which should be easier to prove?
Jul
26
comment Littlewood-Richardson coefficients for Jack symmetric functions
I guess that it might be possible to prove for $\alpha=2$, which correspond to Zonal spherical functions, since there is some more representation theory available there.
Jul
24
reviewed Approve suggested edit on Existence of martingales given some constraint on laws
Jul
23
awarded Enlightened
Jul
23
awarded Nice Answer
Jul
22
comment Efficiently counting all paths of length n in a graph with vertex visitation contraints
This sounds more like a programming problem than a research-level math problem.
Jul
22
revised Open problems/questions in representation theory and around?
added LLT positivity
Jul
17
reviewed Approve suggested edit on Is the set of the convolutions of two-point measures dense in the set of all measures?
Jul
16
comment Are Stack Exchange sites good pedagogical tools?
I suggest that you instead pick some articles on Wikipedia that the student can improve.
Jul
16
comment How possible is it to do mathematical research outside academia?
If you don't have a phd and in not in academia, then no, it will not happen. A person who is brilliant enough to write and publish papers without proper training from an advisor, would without problem also be able to land a permanent position in academia...
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