I'm no longer at Berkeley, but this page lingers on. I finished my dissertation at the end of 2004, and then spent a year in the Discrete Algebraic Methods group at EPFL (the Swiss Federal Polytechnic Institute) in Lausanne, Switzerland. I'm currently a visitor at the BYU math department, back home in Utah, but I'm on the job market.
I still keep a copy of my old home page from my days as an undergraduate and master's degree student at BYU.
Two slightly nifty things: (1) an optical illusion and (2) my name as an ambigram. We all know how rare "slightly nifty things" are.
I get a fair amount of traffic from people wanting to see my inkblot generator. (What do you see in the inkblot generated from your name?)
Firefox users can now see inkblots directly on two new pages I've made. Take your pick: Original Recipe or Extra Spicy.
The 12-Dimensional Cross Polytope is Not Extendably Shellable
Here's a computer-verifiable non-extendable
partial shelling.
Latest interest: Eigenvalues and eigenvectors of one-parameter
families of Hermitian matrices described in terms of multiple
tensor products. (In other words, adiabatic quantum computation.)
To e-mail me:
hthall@math.berkeley.edu
Old pages for Math 32, Math 16A, Math 53, and Math 128A.
Math 54 Questions and Answers