bio  website  eqnets.com 

location  Inside the Beltway  
age  
visits  member for  4 years, 9 months 
seen  20 mins ago  
stats  profile views  9,436 
My mathematicallyoriented work generally explores discrete geometric and probabilistic themes in physics, computation, and communication. Jack of most trades, master of none.
I can be reached at sh#eqnets#com (make the obvious substitutions for #).
1h

comment 
Is the sequence of Apéry numbers a Stieltjes moment sequence?
oeis.org/A228143 
Aug 18 
comment 
Cohomology of the toric variety $X_\Sigma=\mathbb C^2\sqcup \mathbb C^2\big/\left((x,y)_1\sim(x^{1},y^{1})_2\right)_{x,y\neq 0}$
You might want to take a look at Ewald's book: books.google.com/books?id=EEiwI7k7Mx8C 
Aug 9 
answered  Examples of unexpected mathematical images 
Jul 31 
awarded  Popular Question 
Jul 31 
comment 
Reference request for instantons
You might also look at Chapter 8 of Ward and Wells' book on twistors. 
Jul 29 
answered  Escape the zombie apocalypse 
Jul 29 
comment 
Reference request for instantons
It sounds like you're probably past this, but you might take a peek at section 13.2 of amazon.com/ClassicalTheoryFieldsValeryRubakov/dp/0691059276 
Jul 18 
comment 
Rediscovery of lost mathematics
Grassmann is another good example from your link... 
Jul 18 
comment 
Rediscovery of lost mathematics
en.wikipedia.org/wiki/Stark%E2%80%93Heegner_theorem#History 
Jul 18 
comment 
Notable mathematics during World War II
@Gerry: Ha! But I'd been to APG once upon a time and had a rather different impressionthe ordnance was quite loud... 
Jul 2 
awarded  Inquisitive 
Jul 2 
awarded  Curious 
Jun 20 
comment 
Maximum of two normal random variables
en.wikipedia.org/wiki/… 
Jun 17 
reviewed  Approve suggested edit on How do I make the conceptual transition from multivariable calculus to differential forms? 
Jun 12 
comment 
Method to Generate Random Mutually Orthogonal Unitary Matrices
As an aside to Carlo's comment, two mutually orthogonal unitaries can be easily constructed: take diagonal unitaries $U^{(j)} \in U(n)$ for $j = 1,2$ with $U^{(j)}_{kk} = \exp(i\theta^{(j)}_k)$. Orthogonality then means that $\sum_{k=1}^n \exp(i[\theta^{(2)}_k\theta^{(1)}_k]) = 0$. This can be enforced by choosing $\theta^{(2)}_k\theta^{(1)}_k = 2\pi k/n$. 
Jun 12 
comment 
Method to Generate Random Mutually Orthogonal Unitary Matrices
What are mutually orthogonal unitary matrices? 
Jun 8 
awarded  Good Question 
Jun 7 
comment 
First Collision Time for k Random Walkers on a Torus
There are generally more than four adjacent vertices. Also, what is your initial condition? 
Jun 3 
comment 
Probabilistic method used to prove existence theorems
This should be community wiki. 
Jun 3 
answered  Probabilistic method used to prove existence theorems 