bio  website  fph.altervista.org 

location  Pisa, Italy  
age  32  
visits  member for  5 years, 9 months 
seen  21 mins ago  
stats  profile views  2,544 
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.)
Aug
26 
comment 
Computation of a Drazin inverse
Thanks! Could you please expand on how to solve that singular linear system? If I am not missing some crucial detail, it could even be $0X=0$, for instance in the case when A=[0 1; 0 0] .

Aug
25 
reviewed  Approve Left invariant metric on SLn 
Aug
25 
reviewed  Approve Algorithm to express a point from a Hpolyhedron as convex combination of extreme points 
Aug
23 
comment 
Matrix equation $XAXBXC=I$
The equation does not always have a unique solution: for instance, take $n=1$ and $A=B=C=1$, and it becomes $X^3=I$, with three complex unitary solutions. 
Aug
17 
comment 
Listing ORCiD in LaTeX papers
@JoelDavidHamkins Re spam: try clicking on "unsubscribe" at the bottom of their emails. It works. I haven't received a message from academia.edu or researchgate in months. 
Aug
17 
comment 
Proof for the derivative of the determinant of a matrix
Have you even tried searching for it? If I write "derivative determinant" on Google I am showered with relevant results, even on a fresh profile. 
Aug
13 
reviewed  Approve Relative convergence of probability measures 
Aug
12 
comment 
Listing ORCiD in LaTeX papers
Currently most journals do not pick up automatically from LaTeX even the title of the article, which would be trivial in many cases. You have to add it manually in a textbox when submitting. So all I can see happening in the near future is them adding an "insert your ORCiD number here" textbox to their submission process. 
Aug
11 
awarded  Good Answer 
Aug
10 
revised 
finiteelementmethod wiki excerpt
added 319 characters in body 
Aug
10 
reviewed  Approve What is the symbol of a differential operator? 
Aug
10 
wiki  created finiteelementmethod excerpt 
Aug
10 
suggested  approved edit on finiteelementmethod tag wiki excerpt 
Aug
10 
revised 
Cea's lemma and norms
edited tags 
Aug
10 
comment 
Cea's lemma and norms
The answer to 1. is simple: you have probably seen the Céa lemma with a $\forall v_h \in V_h$, for instance here. But if you prove that $something \leq f(v_h)$ for each $v_h \in V_h$, then this also implies $something \leq \inf_{v_h\in V_h} f(v_h)$. 
Aug
10 
comment 
Mathematical software wish list
A program that takes HTML as an input and display on the screen formatted text. So, according to my definition, pdflatex + any pdf reader of your choice is a LaTeX browser. That's why I asked for your definition, not for a counterquestion.

Aug
9 
comment 
Mathematical software wish list
What is a LaTeX browser? 
Aug
9 
awarded  Nice Answer 
Aug
9 
reviewed  Approve Mathematical software wish list 
Aug
9 
reviewed  Approve Krull Dimension 