7,139 reputation
22452
bio website fph.altervista.org
location Pisa, Italy
age 32
visits member for 5 years, 9 months
seen 21 mins ago

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 H-polyhedron 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 finite-element-method wiki excerpt
added 319 characters in body
Aug
10
reviewed Approve What is the symbol of a differential operator?
Aug
10
wiki created finite-element-method excerpt
Aug
10
suggested approved edit on finite-element-method 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 counter-question.
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