bio  website  suvrit.de 

location  Internet  
age  
visits  member for  4 years, 2 months 
seen  2 mins ago  
stats  profile views  8,378 
Researcher in Optimization, Machine Learning, etc.
Hobbyist in a small fraction of the world of Inequalities, Matrix Analysis, Noncommutative polynomials.
I'm here mostly to learn old and new mathematics!
8h

reviewed  Close Parity of primes 
8h

reviewed  Close Obscure Names in Mathematics 
1d

comment 
Comparing the inverse of a diagonally dominant matrix
If $A \preceq B$, then $A^{1} \succeq B^{1}$ as the inverse map is order reversing.... 
1d

comment 
Publishing in mathematics
The answer to your question, and all such fuzzy questions, is the usual: "it depends" 
2d

comment 
Ratio sum comparison on operators
@WillJagy: finally this has been laid to rest :) 
2d

revised 
Ratio sum comparison on operators
added link to the solution by K. Audenaert! 
2d

reviewed  Close Mellin transform on $\mathbb{Z}[\omega]$ 
Oct 19 
comment 
The complex heat kernel on a Riemann manifold
Here's a bunch of links: amazon.com/TheMehlerKernelErwinKronberger/dp/3639241193 $$\ \ \ $$ google.com/… 
Oct 19 
awarded  linearalgebra 
Oct 19 
comment 
Operator norm versus Hlawka inequality
So the question is whether this inequality holds for arbitrary $2\times 2$ matrices under the operator norm? 
Oct 19 
comment 
Is the notation ${}^t g$ for the transpose of a linear transformation intended to be suggestive?
@GeraldEdgar: I see, that's where it comes from! 
Oct 18 
answered  Which nonnegative matrices have exact nonnegative matrix factors of smaller dimensionality? 
Oct 18 
comment 
Is the notation ${}^t g$ for the transpose of a linear transformation intended to be suggestive?
I guess to highlight that transposition itself is a linear operation, so it makes "pedantic" sense to have it appear before (though I find it grotesque, rather than "highbrow")... 
Oct 17 
comment 
How is constrained optimization done?
Wrong site for such a question, though given the breadth of possible answers, this question is not yet suitable for the other SE sites either (e.g., scicomp.SE, math.SE, etc.) 
Oct 17 
comment 
A lower bound on $\\cdot\_{p_{\ast}}$ image of $\ell^{q_{\ast}}$ vectors
Nice paper Cristóbal! I should read it! 
Oct 17 
reviewed  Close quadratic knacksack problem, state of art 
Oct 17 
comment 
An inequality for the ratio of standard Young tableau with {1,2,…,k} in the first row
Somehow this reminds me of a related Schur polynomial majorization style inequality that once Gjergji Zaimi had posted on MO....cannot find that link right now.. 
Oct 17 
comment 
Can we define logconvex operators?
One introduction to this for positive definite matrices (as a classical example) is to look at my paper: arxiv.org/abs/1312.1039 (the citations in that paper will lead you to more classical references for related material) 
Oct 16 
reviewed  Close Population Variance PDF given Sample Variance 
Oct 16 
comment 
Can we define logconvex operators?
For starters, if you restrict to positive elements in your space, then this should be doable. Probably best to think in terms of convex cones with the associated partial order. 