bio  website  fph.altervista.org 

location  Pisa, Italy  
age  32  
visits  member for  5 years, 4 months 
seen  13 mins ago  
stats  profile views  2,346 
Numerical linear algebra. Mainly matrix equations and their applications (control theory, applied probability).
(This profile was written for Mathoverflow, but Stack Exchange insists on copying it over verbatim to other sites, where it makes less sense.)
1d

revised 
Lagrangian submanifold of a CalabiYau manifold
expanded abbreviation in the title, for clarity 
Mar 27 
answered  Two equivalent descriptions of a physical system yielding a nontrivial mathematical formula 
Mar 25 
answered  The maximal eigenvalue of a symmetric Toeplitz matrix 
Mar 24 
awarded  Enlightened 
Mar 24 
awarded  Nice Answer 
Mar 24 
comment 
Handling arXiv feeds to avoid duplicates
RSS feeds are updated once per day, too. 
Mar 24 
answered  Automatically generate BibTeX item from arxiv 
Mar 23 
reviewed  Approve hilbertspaces tag wiki excerpt 
Mar 21 
reviewed  Approve Upper bound for a Selbergtype integral over a rectangular region 
Mar 21 
reviewed  Approve Injective dimension of cyclic modules 
Mar 19 
answered  What are interesting heuristics of determining how far given matrix is from a singular one? 
Mar 19 
comment 
What are interesting heuristics of determining how far given matrix is from a singular one?
Why "heuristics"? The two examples that you mention are rigorously defined measures. 
Mar 16 
comment 
Rounding errors in images of Julia sets
Please do not post the same question on two SE sites immediately. Crossposting is ok, but only after you did not get a satisfying answer in a few days' time. 
Mar 14 
reviewed  Approve Group laws in class field theory 
Mar 14 
comment 
How to calculate one Cauchy type determinant
I don't know about the determinant, but there is some theory on how to compute inverses (and sums and products) of generalized Cauchy matrices. An important quantity is the rank of the numerator (displacement rank), in your case 2. For instance, the inverse of such a matrix (when it exists) will have the same displacement rank. Or there are algorithms to compute their LU decomposition in $O(n^2\cdot \text{(displacement_rank)})$ 
Mar 13 
reviewed  Approve Analytic Solution to SDEs 
Mar 6 
comment 
Inverse of a matrix expression
$t_i$ is a row vector, I guess? In any case, try applying en.wikipedia.org/wiki/Sherman%E2%80%93Morrison_formula to get rid of the inverse. 
Mar 5 
comment 
Bounds on HilbertSchmidt norm of difference of products of matrices
In any case, the proof is a oneliner: the same formula without the norms is an identity (telescoping sum). 
Mar 5 
revised 
Bounds on HilbertSchmidt norm of difference of products of matrices
added 3 characters in body 
Mar 5 
comment 
Bounds on HilbertSchmidt norm of difference of products of matrices
@QAMS No, I don't know of a place where that identity and triangle inequality argument appear. For the inequalities combining HSnorm and 2norm, you can see for instance Hogben, Handbook of Linear Algebra, 375 (it is a mammothsized book full of facts to cite in linear algebra) 