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.

7h
reviewed Approve suggested edit on Curvatures preserved under the Kahler-Ricci flow
1d
comment trigonometric sum and inequalities
A bit more background would be nice...
2d
awarded Yearling
2d
awarded Yearling
2d
comment Complexity Dick Word in Turing Machine single tape
Note, the complexity for comparing two numbers of similar size $n$ is $O(n^2)$, (I think), so this is a lower bound.
2d
comment Complexity Dick Word in Turing Machine single tape
This sounds like homework... is this really research related?
2d
comment Are sums of 0-1 Pareto efficient vectors Pareto efficient?
Have you done any computer searches for small m and n?
2d
comment Are sums of 0-1 Pareto efficient vectors Pareto efficient?
Ah, ok, that makes more sense then.
2d
answered Are sums of 0-1 Pareto efficient vectors Pareto efficient?
Oct
22
comment Painting $n$ balls from $2n$ balls red, and guessing which ball is red, game
Maybe you can change terminology a bit: There are $2n$ distinct (numbered) items. Lucy paints half of them red. Alice wants to find a red object. Usually, a box can contain arbitrary many balls, but for 0 or 1 balls only, it is easier to use color as a marker.
Oct
22
comment K-Permutations with forbidden numbers
This is about constructing an algorithm. I don't think you can get better complexity than just a search. It might be possible to have a look on the permutation matrix representation for a graphical way to represent this.
Oct
21
comment Splitting integers 1, 2, 3, … n to avoid least possible sum
I suggest to calculate $g(n)$ for small values and search OEIS.
Oct
21
comment Real points of zero-dimensional real algebraic varieties
Are there bounds on the degrees of these polynomials?
Oct
21
reviewed Approve suggested edit on Reference request: Invariant sets of dynamical systems
Oct
19
reviewed Approve suggested edit on Does $ \text{mult}(R / I) = d_{1} \cdots d_{r} $ imply that $ (f_{1},\ldots,f_{r}) $ is an $ R $-regular sequence?
Oct
19
comment is there an analogy between fractals and automorphic forms?
You might be interested in the book "Indras Pearls" about authomorphism-groups, Kleinian groups, and fractals.
Oct
19
revised Separating points in the plane II
language
Oct
18
reviewed Approve suggested edit on Testing whether an integer is the sum of two squares
Oct
18
comment A good book on adeles and ideles
I think the answer might be ... rolling in the deep.
Oct
17
comment Shift-invariant symmetric functions in representation theory?
Is there then a corresponding notion of Schur functions for these Lie algebras?
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