bio  website  suvrit.de 

location  Internet  
age  
visits  member for  4 years, 11 months 
seen  1 min ago  
stats  profile views  9,388 
Researcher in Optimization and Machine Learning.
Hobbyist in Inequalities, Matrix Analysis, Combinatorics, Algebra, etc.
I'm here mostly to learn mathematics!
19h

awarded  Necromancer 
1d

comment 
Any interesting properties of the matrix $M:=(m_{ij})$ with $m_{ij}=min(i,j)$?
This is a very interesting matrix (Brownian bridge kernel); for instance, see section 3 of my notes: arxiv.org/pdf/1411.4107v2.pdf 
1d

reviewed  Close How many techniques are there to test colliniarity of n points? 
2d

awarded  Reviewer 
2d

reviewed  Leave Open soft: Reference/ Suggested Read: Homological Algebraic techniques in PDEs 
2d

reviewed  Close Indecomposable commutative rings 
Aug 1 
reviewed  Leave Open Particular case of Beal's Conjecture 
Aug 1 
answered  Algorithm to quickly compute the individual inverses of a linear sequence of matrices 
Jul 29 
reviewed  Close Recursion, Common Term, Combinatorics 
Jul 28 
comment 
Number of bases of a matroid
I was confused with the notation; if you only pick $a_1,b_1$ and $a_2, b_2$ but set the rest $a_i, b_i$ to zero, then the constraints $a_i,b_i \ge 1$ get violated. I guess, you are also optimizing over $k$ at the same time, not just over $a_i,b_i$, which explains my confusion! Thanks. 
Jul 28 
reviewed  Close Crossing all boundaries on a map? 
Jul 28 
reviewed  Close Pairwise distance distribution for point clouds (normal distribution) 
Jul 28 
comment 
Number of bases of a matroid
Is it really $a_i, b_i \ge 1$ for all $i$? In which case the unconstrained minimum value is with $a_i=b_i=1$  but this could violate the summation constraints, but in any case, this is going to be different from the $a_1,b_1$ claim in your comment.. 
Jul 27 
awarded  Guru 
Jul 27 
comment 
Eigenvalues of the sum of two matrices, where one is $B=\operatorname{diag}(1, 0,\dots,0)$
Have a look at: cs.vu.nl/~ran/LectureBerlijn2010.pdf  basically, your problem is that of determining eigenvalues after a rankone perturbation... 
Jul 26 
comment 
Which journals publish applied mathematics with mostly pure mathematics content?
@NateEldredge: I doubt that; I once received a review that explicitly asked me to delete all details about the applied stuff and numerical results, and to retain only the math (which the referee found publishable), with at best citations to applied contexts! 
Jul 26 
comment 
Computer calculations in a paper
In addition to putting stuff in the paper, a practical alternative is to make mathematica (or other relevant software) notebooks available online, in addition to any amount of additional written supplementary material. This material serves the purpose of making the work "more verifiable"  and saves on valuable space in the paper, which I think should be used to include the "highlights" of even the computational part. 
Jul 24 
comment 
integral schur function over standard simplex
An impractical idea (perhaps a totally useless one): write the Schur polynomials as a sum of monomial symmetric functions, then integrate those using "standard" methods, and conclude ... 
Jul 24 
reviewed  Close Eigenvalue Problem — prove eigenvalue for A^2 + I 
Jul 24 
reviewed  Close How to calculate $det(X^TX)$ efficiently, update one column of X each time 