bio | website | |
---|---|---|
location | ||
age | ||
visits | member for | 3 years, 4 months |
seen | 20 hours ago | |
stats | profile views | 321 |
Nov 27 |
comment |
translation invariance of the Laughlin wave function
@Carlo Beenakker : What about Laughlins wavefunction on the sphere ? In this case Laughlins wavefunction is SU(2) invariant. |
Sep 3 |
comment |
How to solve such an optimization problem
It's here (already cited in another comment): 130.44.194.100/mcom/2001-70-236/S0025-5718-00-01262-X/… . Since it contains a raw internet address it's not allowed to use this as a link in an answer. |
Sep 2 |
revised |
How to solve such an optimization problem
Index Legendre polynomial K -1 instead of N - 1 . |
Aug 31 |
answered | How to solve such an optimization problem |
Aug 24 |
comment |
How to solve such an optimization problem
Here a link to the paper of Fejer : math.technion.ac.il/hat/fpapers/fejerpisa.pdf |
Aug 23 |
comment |
How to solve such an optimization problem
@peng : If the optimal values of $x_i$ take only K different values, then these values are the Fekete points, because then all non zero terms in the sum are maximized. |
Aug 19 |
awarded | Yearling |
Aug 1 |
comment |
Finite subgroups (lattices) in the large N limit of SU(N)
A larger finite subgroup than the Weyl-Heisenberg group is its normalizer, see e.g. arxiv.org/abs/1003.3591v2 . |
Jul 2 |
awarded | Curious |
Jun 12 |
comment |
Method to Generate Random Mutually Orthogonal Unitary Matrices
What exactly is the probability measure you want to simulate ? |
Jun 11 |
comment |
Computing $\int_0^T e^{itA}Be^{-itA} dt$ without an infinite series
Why so complicated ? Simply diagonalize A, as mentioned by Christian Remling. |
May 25 |
awarded | Editor |
May 25 |
revised |
Is this functional maximized by SU(2) coherent states?
added 6 characters in body |
May 25 |
asked | Is this functional maximized by SU(2) coherent states? |
May 22 |
comment |
eigenvalues of product of many symmetric positive definite matrices
if d is even then all eigenvalues might be negative : According to the theorem of Ballantine (projecteuclid.org/download/pdf_1/euclid.pjm/1102991595) we can write minus identity as a product of positive definite real matrices, since it has positive determinant. |
May 22 |
comment |
eigenvalues of product of many symmetric positive definite matrices
Wurlitzer : to "negative definite" : Not true, e.g. for x = 2, there is 1 positive and 1 negative eigenvalue, so its neither positive nor negative definite. |
May 20 |
comment |
Absolute value inequality for complex numbers
@Deane Yang : Doesn't work because for the 3 distinct third roots of unity also equality holds. |
May 20 |
comment |
Absolute value inequality for complex numbers
If we choose the third roots of unity for a,b,c then equality holds. |
May 18 |
comment |
Solvability of a Fredholm system in $L^2$
@fedja : So the answer is yes : all eigenfunctions with non zero eigenvalue of the integral operator restricted to the subspace of odd functions are solutions. |
Apr 1 |
comment |
A.C. spectrum of the non additive perturbation BAB of a self-adjoint operator A where B is strictly positive
Is this related to anderson localisation ? |